Updated on 2022/03/31

写真a

 
MORI Yojiro
 
Organization
Graduate School of Engineering Information and Communication Engineering 1 Associate professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Electrical Engineering, Electronics, and Information Engineering
Title
Associate professor
Contact information
メールアドレス

Degree 1

  1. 博士(工学) ( 2013.3   東京大学 ) 

Research Interests 3

  1. Optical-fiber communications

  2. Digital signal processing

  3. Nonlinear optics

Research Areas 2

  1. Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

  2. Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment

Current Research Project and SDGs 2

  1. フォトニックネットワークにおける伝送限界の追究

  2. 適応制御による超高密度フォトニックネットワークの研究

Education 1

  1. The University of Tokyo   Graduate School, Division of Engineering

    - 2013.3

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    Country: Japan

Professional Memberships 4

  1. The Institute of Electrical and Electronics Engineers, Inc.

  2. Optical Society of America

  3. 電子情報通信学会

  4. レーザー学会

Committee Memberships 2

  1. IEEE International Conference on Photonics   Technical Program Committee  

    2019.12   

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    Committee type:Academic society

  2. SPIE Photonics West   Committee Member  

    2018.1   

Awards 2

  1. Optical Communications Best Technical Paper Award

    2018.1   SPIE Photonics West  

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    Award type:Award from international society, conference, symposium, etc.  Country:United States

  2. Best Paper Award

    2016.7  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

 

Papers 145

  1. Design and evaluation of a reconfigurable optical add-drop multiplexer with flexible wave-band routing in SDM networks

    Kuno Takuma, Mori Yojiro, Subramaniam Suresh, Jinno Masahiko, Hasegawa Hiroshi

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   Vol. 14 ( 4 ) page: 248 - 256   2022.4

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    Language:Japanese  

    DOI: 10.1364/JOCN.450504

    Web of Science

  2. Fragmentation-Minimized Periodic Network-Bandwidth Expansion Employing Aligned Channel Slot Allocation in Flexible Grid Optical Networks

    Hasegawa Hiroshi, Yasuda Takuma, Mori Yojiro, Sato Ken-ichi

    IEICE TRANSACTIONS ON COMMUNICATIONS   Vol. E104B ( 12 ) page: 1514 - 1523   2021.12

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  3. Design and verification of a LO bank enabled by fixed-wavelength lasers and fast tunable silicon ring filters for creating large scale optical switches

    Matsumoto Ryosuke, Konoike Ryotaro, Matsuura Hiroyuki, Suzuki Keijiro, Inoue Takashi, Mori Yojiro, Ikeda Kazuhiro, Namiki Shu, Sato Ken-Ichi

    OPTICS EXPRESS   Vol. 29 ( 24 ) page: 39930 - 39945   2021.11

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    Language:Japanese  

    DOI: 10.1364/OE.439469

    Web of Science

  4. Design and control of highly spectrally efficient photonic networks enabled by fiber-granular routing on overlaid ring-shaped topologies

    Shiraki Ryuta, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi, Monti Paolo

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   Vol. 13 ( 11 ) page: 233 - 243   2021.11

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    Language:Japanese  

    DOI: 10.1364/JOCN.428571

    Web of Science

  5. High-port-count optical circuit switches for intra-datacenter networks [Invited Tutorial]

    Mori Yojiro, Sato Ken-Ichi

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   Vol. 13 ( 8 ) page: D43 - D52   2021.8

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    Language:Japanese  

    DOI: 10.1364/JOCN.425929

    Web of Science

  6. Scalable and Fast Optical Circuit Switch Based on Colorless Coherent Detection: Design Principle and Experimental Demonstration

    Matsumoto Ryosuke, Inoue Takashi, Konoike Ryotaro, Matsuura Hiroyuki, Suzuki Keijiro, Mori Yojiro, Ikeda Kazuhiro, Namiki Shu, Sato Ken-ichi

    JOURNAL OF LIGHTWAVE TECHNOLOGY   Vol. 39 ( 8 ) page: 2263 - 2274   2021.4

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    Language:Japanese  

    DOI: 10.1109/JLT.2021.3050734

    Web of Science

  7. Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM Networks

    Okamura Kazuya, Mori Yojiro, Hasegawa Hiroshi

    IEEE PHOTONICS JOURNAL   Vol. 13 ( 2 )   2021.4

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  8. Evaluation of low-complexity digital coherent receivers for short-reach transmission systems

    Kuno Takuma, Mori Yojiro, Hasegawa Hiroshi

    METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS IV   Vol. 11712   2021

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    Language:Japanese  

    DOI: 10.1117/12.2577542

    Web of Science

  9. Design and Performance Evaluation of Resilient Optical Path Networks That Adopt Spatially-Jointed Flexible Waveband Routing

    Munakata Ryuji, Mori Yojiro, Subramaniam Suresh, Jinno Masahiko, Hasegawa Hiroshi

    2021 INTERNATIONAL CONFERENCE ON OPTICAL NETWORK DESIGN AND MODELLING (ONDM)     2021

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    Language:Japanese  

    Web of Science

  10. Experimental Evaluation of Optical Cross-Connects with Flexible Waveband Routing Function for SDM Networks

    Kuno Takuma, Mori Yojiro, Subramaniam Suresh, Jinno Masahiko, Hasegawa Hiroshi

    2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)     2021

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    Language:Japanese  

    Web of Science

  11. Estimation for IQ skew of A Transmitter in Digital Coherent Communication Systems

    Tsuchida Naoki, Kuno Takuma, Mori Yojiro, Hasegawa Hiroshi

    2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)     2021

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  12. Assessment of Optical Node Architectures for Building Next Generation Large Bandwidth Networks

    Ganbold Mungun-Erdene, Yasuda Takuma, Mori Yojiro, Hasegawa Hiroshi, Inuzuka Fumikazu, Hirano Akira, Sato Ken-ichi

    IEICE TRANSACTIONS ON COMMUNICATIONS   Vol. E103B ( 6 ) page: 679 - 689   2020.6

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  13. Transmission-Quality-Aware Online Network Design and Provisioning Enabled by Optical Performance Monitoring

    Kayano Keisuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Oda Shoichiro, Yoshida Setsuo, Hoshida Takeshi

    IEICE TRANSACTIONS ON COMMUNICATIONS   Vol. E103B ( 6 ) page: 670 - 678   2020.6

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  14. Design of seamlessly and limitlessly expandable OXC and verification tests on its versatile applicability

    Hashimoto Ryota, Mori Yojiro, Hasegawa Hirioshi, Sato Ken-ichi

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   Vol. 12 ( 5 ) page: 99 - 108   2020.5

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    Language:Japanese  

    DOI: 10.1364/JOCN.384140

    Web of Science

  15. Wavelength-Division Demultiplexing Enhanced by Silicon-Photonic Tunable Filters in Ultra-Wideband Optical-Path Networks

    Mori Yojiro, Honda Eiji, Shiraki Ryuta, Suzuki Keijiro, Matsuura Hiroyuki, Kawashima Hitoshi, Namiki Shu, Ikeda Kazuhiro, Sato Ken-Ichi

    JOURNAL OF LIGHTWAVE TECHNOLOGY   Vol. 38 ( 5 ) page: 1002 - 1009   2020.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/JLT.2019.2947709

    Web of Science

  16. Architecture and Design of Coarse/Fine Hybrid Granular Routing Optical Networks

    Ito Yusaku, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    IEICE TRANSACTIONS ON COMMUNICATIONS   Vol. E103B ( 2 ) page: 118 - 129   2020.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transcom.2019EBP3026

    Web of Science

  17. Scalable and Fast Optical Circuit Switch Created with Silicon-Photonic Tunable-Filter-based Local Oscillator Bank and Colorless Coherent Detection

    Matsumoto Ryosuke, Inoue Takashi, Konoike Ryotaro, Matsuura Hiroyuki, Suzuki Keijiro, Mori Yojiro, Ikeda Kazuhiro, Namiki Shu, Sato Ken-ichi

    2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)     2020

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    Language:Japanese  

    Web of Science

  18. Resource Assignment based on Core-State Value Evaluation to Handle Crosstalk and Spectrum Fragments in SDM Elastic Optical Networks

    Wang Yang, Mori Yojiro, Hasegawa Hiroshi

    2020 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2020)     2020

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    Language:Japanese  

    Web of Science

  19. Low-Complexity DSP Configuration for Short-Reach Transmission Systems

    Kuno Takuma, Mori Yojiro, Hasegawa Hiroshi

    2020 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2020)     2020

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    Language:Japanese  

    Web of Science

  20. Large-Scale Optical Switch Architectures for Intra-Datacentre Networks

    Mori Yojiro, Sato Ken-ichi

    2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)     2020

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  21. Large-Scale and Fast Optical Circuit Switch for Coherent Detection Using Tunable Local Oscillators Formed with Wavelength Bank and Widely-Tunable Silicon Ring Filters

    Matsumoto Ryosuke, Konoike Ryotaro, Matsuura Hiroyuki, Suzuki Keijiro, Inoue Takashi, Mori Yojiro, Ikeda Kazuhiro, Namiki Shu, Sato Ken-ichi

    2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)     2020

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  22. Joint Pre-emphasis and Partial-response Coding for Spectrum Narrowing Caused by Repeated Optical-node Traversal in Ultra-dense WDM Networks

    Okamura Kazuya, Mori Yojiro, Hasegawa Hiroshi

    2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)     2020

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    Language:Japanese  

    Web of Science

  23. High-Throughput Optical Circuit Switch for Intra-Datacenter Networks Based on Spatial Super-Channels

    Honda Eiji, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)     2020

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    Language:Japanese  

    Web of Science

  24. A 2.15 Pbps Throughput Optical Cross-Connect with Flexible Waveband Routing

    Kuno Takuma, Mori Yojiro, Hasegawa Hiroshi

    2020 IEEE 8TH INTERNATIONAL CONFERENCE ON PHOTONICS (ICP)     2020

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    Language:Japanese  

    Web of Science

  25. Demonstration of 4.3 Pbps Optical Circuit Switching for Intra-Datacentre Networks Based on Spatial Super-Channels

    Honda Eiji, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)     2020

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  26. Dynamically Controlled Flexible-Grid Networks Based on Semi-Flexible Spectrum Assignment and Network-StateValue Evaluation

    Shiraki Ryuta, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi

    2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)     2020

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    Language:Japanese  

    Web of Science

  27. Evaluation of Optical Circuit Switches for SDM-Based Intra-Datacenter Networks

    Honda Eiji, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2020 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2020)     2020

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    Language:Japanese  

    Web of Science

  28. High-Throughput and High-Port-Count Optical Cross-Connents Using Flexible Waveband Routing

    Kuno Takuma, Mori Yojiro, Subramaniam Suresh, Jinno Masahiko, Hasegawa Hiroshi

    2020 INTERNATIONAL CONFERENCE ON OPTICAL NETWORK DESIGN AND MODELING (ONDM)     2020

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  29. Quasi-Nyquist WDM networks using receiver-side quadrature duo-binary/quaternary spectrum shaping

    Okamura Kazuya, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS III   Vol. 11308   2020

  30. Low-Complexity Digital Coherent Receivers for Short-Reach Transmission Systems

    Kuno Takuma, Mori Yojiro, Hasegawa Hiroshi

    2020 IEEE PHOTONICS CONFERENCE (IPC)     2020

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  31. Highly spectrally efficient metro networks that adopt fiber-level granular routing on overlaid line-/ring-shaped virtual topologies

    Shiraki Ryuta, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Monti Paolo

    METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS III   Vol. 11308   2020

  32. Design and evaluation of quasi-Nyquist WDM networks utilizing widely deployed wavelength-selective switches

    Shiraki Ryuta, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    OPTICS EXPRESS   Vol. 27 ( 13 ) page: 18549 - 18560   2019.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1364/OE.27.018549

    Web of Science

  33. Assessment of Node-and Link-Level Blocking and Creating Cost-Effective Networks in the Era of Large Bandwidth Services

    Yamakami Shuhei, Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Inuzuka Fumikazu, Hirano Akira

    IEICE TRANSACTIONS ON COMMUNICATIONS   Vol. E102B ( 3 ) page: 510-521   2019.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transcom.2018EBP3140

    Web of Science

  34. Highly Dense Elastic Optical Networks Enabled by Grouped Routing With Distance-Adaptive Modulation

    Kayano Keisuke, Yamaoka Shuhei, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    IEEE PHOTONICS TECHNOLOGY LETTERS   Vol. 31 ( 4 ) page: 295-298   2019.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/LPT.2019.2892506

    Web of Science

  35. Design and Evaluation of Optical Circuit Switches for Intra-Datacenter Networking

    Mori Yojiro, Ganbold Mungun-Erdene, Sato Ken-ichi

    JOURNAL OF LIGHTWAVE TECHNOLOGY   Vol. 37 ( 2 ) page: 330-337   2019.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/JLT.2019.2891209

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  36. Feasibility Test of Large-Scale (1,424x1,424) Optical Circuit Switches Utilizing Commercially Available Tunable Lasers

    Honda Eiji, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2019 24TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) AND 2019 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING AND COMPUTING (PSC)     2019

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    Language:Japanese  

    Web of Science

  37. Evaluation of WSS Characteristics in Highly Dense WDM Networks

    Okamura Kazuya, Yamaoka Shuhei, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2019 24TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) AND 2019 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING AND COMPUTING (PSC)     2019

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    Language:Japanese  

    Web of Science

  38. Digital post-processing against inline spectrum narrowing caused by optical node traversals

    Yamaoka Shuhei, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    IEICE COMMUNICATIONS EXPRESS   Vol. 8 ( 4 ) page: 93-98   2019

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/comex.2018XBL0162

    Web of Science

  39. Design of and Resiliency Enhancement in Coarse/Fine Hybrid Granular Routing Optical Networks Based on Iterative Path-Pair-Loop Inflation

    Itakura Keisuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2019 15TH INTERNATIONAL CONFERENCE ON THE DESIGN OF RELIABLE COMMUNICATION NETWORKS (DRCN 2019)     page: 11-15   2019

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    Web of Science

  40. Demonstration of Quasi-Nyquist WDM Networks Using Widely Deployed Wavelength-Selective Switches

    Shiraki Ryuta, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2019

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    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  41. Effectiveness of transmission-quality-aware online network design and provisioning enabled through optical performance monitoring

    Kayano Keisuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Oda Shoichiro, Yoshida Setsuo, Hoshida Takeshi

    IEICE COMMUNICATIONS EXPRESS   Vol. 8 ( 4 ) page: 81-86   2019

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/comex.2018XBL0157

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  42. Verification of High Performance and Wide Applicability of Seamlessly Expandable and Limitless OXC

    Hashimoto Ryota, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2019

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  43. Novel Network Architecture Enabling Quasi-Nyquist Wavelength-Division Multiplexing

    Shiraki Ryuta, Yamaoka Shuhei, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS II   Vol. 10946   2019

  44. A Large-Scale Optical Circuit Switch Using Fast Wavelength-Tunable and Bandwidth-Variable Filters

    Ganbold Mungun-Erdene, Nagai Hiroki, Mori Yojiro, Suzuki Keijiro, Matsuura Hiroyuki, Tanizawa Ken, Ikeda Kazuhiro, Namiki Shu, Kawashima Hitoshi, Sato Ken-ichi

    IEEE PHOTONICS TECHNOLOGY LETTERS   Vol. 30 ( 16 ) page: 1439-1442   2018.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/LPT.2018.2852328

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  45. Design and Verification of Large-Scale Optical Circuit Switch Using ULCF AWGs for Datacenter Application

    Nagai H., Mori Y., Hasegawa H., Sato K.

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   Vol. 10 ( 7 ) page: B82-B89   2018.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1364/JOCN.10.000B82

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  46. First Demonstration of Subsystem-Modular Optical Cross-Connect Using Single-Module 6 x 6 Wavelength-Selective Switch Invited Reviewed

    Hashimoto Ryota, Yamaoka Shuhei, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi, Yamaguchi Keita, Seno Kazunori, Suzuki Kenya

    JOURNAL OF LIGHTWAVE TECHNOLOGY   Vol. 36 ( 7 ) page: 1435 - 1442   2018.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/JLT.2018.2800082

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  47. Spectrally Efficient and Highly Resilient Grouped Routing Network Enhanced with Optical Performance Monitoring

    Kayano Keisuke, Saito Hiroshi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Oda Shoichiro, Yoshida Setsuo, Hoshida Takeshi

    2018 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)     page: .   2018

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  48. Demonstration of 153.6-Tbps Throughput from 1,536x1,536 Optical Switch with Uniform-Loss and Cyclic-Frequency AWGs

    Nagai Hiroki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS   Vol. 10560   2018

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1117/12.2288268

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  49. Assessment of optical cross-connect architectures for the creation of next generation optical networks

    Ganbold Mungun-Erdene, Yasuda Takuma, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)     page: .   2018

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  50. Architecture and Design of Quasi-Nyquist WDM Networks with Flexible Grid Granular Switching

    Shiraki Ryuta, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2018 PHOTONICS IN SWITCHING AND COMPUTING (PSC)     page: .   2018

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  51. A New Framework for Nation-Wide Networking in Future Datacenter-Traffic Centric Era

    Kayano Keisuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Inuzuka Fumikazu, Hirano Akira

    2018 PHOTONICS IN SWITCHING AND COMPUTING (PSC)     page: .   2018

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  52. Fragmentation-Minimized Transponder Upgrading Employing Channel Bandwidth Aligned Slot Allocation in Flexible Grid Optical Networks

    Hasegawa Hiroshi, Yasuda Takuma, Mori Yojiro, Sato Ken-ichi

    2018 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)     page: .   2018

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  53. Large-Scale Optical Circuit Switch Architecture for Intra-Datacenter Networking

    Mori Yojiro, Sato Ken-ichi

    2018 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)     page: .   2018

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    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  54. Large-scale optical node architecture enabling spectral-efficiency maximization in ultra-dense WDM networks

    Yamaoka Shuhei, Hashimoto Ryota, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS   Vol. 10560   2018

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1117/12.2288270

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  55. Next-Generation ROADM Employing Bandwidth-Adaptive Silicon-Photonic Filters for Flexible Drop Operation

    Mori Yojiro, Ueda Koh, Suzuki Keijiro, Matsuura Hiroyuki, Tanizawa Ken, Ikeda Kazuhiro, Namiki Shu, Kawashiwa Hitoshi, Sato Ken-ichi

    2018 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)     page: .   2018

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  56. Spectral Utilization Efficient Coarse Granular Routing Optical Networks with Resiliency against Multiple Failures

    Ishikawa Tomohiro, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2018 21ST CONFERENCE ON INNOVATION IN CLOUDS, INTERNET AND NETWORKS AND WORKSHOPS (ICIN)     page: .   2018

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  57. Fast Optical Circuit Switch Using Monolithically Integrated Silicon-Photonic Space Switch and Wavelength-Tuneable Filter

    Mori Yojiro, Ganbold Mungun-Erdene, Shiraki Ryuta, Suzuki Keijiro, Matsuura Hiroyuki, Kawashima Hitoshi, Namiki Shu, Ikeda Kazuhiro, Sato Ken-ichi

    2018 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     2018

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  58. Novel Demodulation Framework Based on Quadrature Duo-Binary/Quaternary/Octernary Spectrum Shaping and MLSE for Mitigating Spectrum Narrowing Caused by Node Traversals

    Yamaoka Shuhei, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2018 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     2018

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  59. Spectral Efficiency Maximization of Grouped Routing Optical Networks With Shared Protection Reviewed

    Ishikawa Tomohiro, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   Vol. 9 ( 10 ) page: 864 - 875   2017.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1364/JOCN.9.000864

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  60. Fast Optical Circuit Switch for Intra-Datacenter Networking Invited Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Matsuura Hiroyuki, Ishii Kiyo, Kuwatsuka Haruhiko, Namiki Shu, Watanabe Toshio, Sato Ken-ichi

    IEICE TRANSACTIONS ON COMMUNICATIONS   Vol. E100B ( 10 ) page: 1740 - 1746   2017.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transcom.2017OBI0002

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  61. Large-Scale Optical Node Utilizing M x M WSSs Optimally Configured for Traffic Distribution Reviewed

    Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi

    IEEE PHOTONICS TECHNOLOGY LETTERS   Vol. 29 ( 16 ) page: 1293 - 1296   2017.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/LPT.2017.2707474

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  62. Highly reliable and large-scale subsystem-modular optical cross-connect Reviewed

    Yamakami Shuhei, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi

    OPTICS EXPRESS   Vol. 25 ( 15 ) page: 17982 - 17994   2017.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1364/OE.25.017982

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  63. Compact OXC architecture, design and prototype development for flexible waveband routing optical networks Reviewed

    Ishikawa Tomohiro, Mori Yojiro, Hasegawa Hiroshi, Subramaniam Suresh, Sato Ken-ichi, Moriwaki Osamu

    OPTICS EXPRESS   Vol. 25 ( 14 ) page: 15838 - 15853   2017.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1364/OE.25.015838

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  64. Large-Scale Optical Switch Utilizing Multistage Cyclic Arrayed-Waveguide Gratings for Intra-Datacenter Interconnection Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    IEEE PHOTONICS JOURNAL   Vol. 9 ( 1 )   2017.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/JPHOT.2016.2635384

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  65. Algorithm for Raising OXC Port Count to Meet Traffic Growth at Minimum Cost Invited Reviewed

    Sato Kosuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   Vol. 9 ( 2 ) page: A263 - A270   2017.2

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    DOI: 10.1364/JOCN.9.00A263

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  66. Tipping Point for the Future Scalable OXC: What Size M x M WSS Is Needed? Invited Reviewed

    Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   Vol. 9 ( 1 ) page: A18 - A25   2017.1

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    DOI: 10.1364/JOCN.9.000A18

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  67. Impairment Mitigation in Non-Coherent Optical Transmission Enabled with Machine Learning for Intra-Datacenter Networks Reviewed

    Ito Keisuke, Niwa Masaki, Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    NEXT-GENERATION OPTICAL NETWORKS FOR DATA CENTERS AND SHORT-REACH LINKS IV   Vol. 10131   2017

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    DOI: 10.1117/12.2253456

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  68. Highly Reliable Large-Scale Optical Cross-Connect Architecture Utilizing MxM Wavelength-Selective Switches Reviewed

    Yamakami Shuhei, Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2017

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  69. Dynamic Control of Coarse/Fine Hybrid Granular Routing Optical Networks Reviewed

    Ito Yusaku, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2017

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  70. Optical Tunable Filter for Gridless ROADM Reviewed

    Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2017

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  71. Silicon Photonics C-Band Tunable Filter for Large-Scale Optical Circuit Switches Reviewed

    Suzuki Keijiro, Tanizawa Ken, Suda Satoshi, Matsuura Hiroyuki, Ikeda Kazuhiro, Mori Yojiro, Sato Ken-ichi, Namiki Shu, Kawashima Hitoshi

    2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)     page: .   2017

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  72. Novel Intra- and Inter-Datacenter Converged Network Exploiting Space- and Wavelength-Dimensional Switches Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2017

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  73. Network expansion strategy for elastic optical networks that considers channel capacity upgrades Reviewed

    Yasuda Takuma, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS IX   Vol. 10129   2017

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    DOI: 10.1117/12.2250489

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  74. Novel Laser-Linewidth Measurement Based on Three-Wave Interference Using Digital Coherent Receiver

    Yamaoka Shuhei, Mori Yojiro, Sato Ken-ichi

    2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)     page: .   2017

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  75. First Demonstration of Subsystem-Modular Optical Cross-Connect Using Single-Module 6x6 WSS

    Hashimoto Ryota, Yamaoka Shuhei, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Yamaguchi Keita, Seno Kazunori, Suzuki Kenya

    43RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC 2017)     page: .   2017

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  76. Large-Scale Optical Circuit Switch Architecture for Intra-Datacentre Networking

    Mori Yojiro, Ueda Koh, Hasegawa Hiroshi, Sato Ken-ichi

    2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)     page: .   2017

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  77. Joint Pre-, Inline-, and Post-Compensation of Spectrum Narrowing Caused by Traversing Multiple Optical Nodes

    Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    43RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC 2017)     2017

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  78. Dynamic Router Performance Control Utilizing Support Vector Machines for Energy Consumption Reduction Reviewed

    Kawase Hiroshi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-chi

    IEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENT   Vol. 13 ( 4 ) page: 860-870   2016.12

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    DOI: 10.1109/TNSM.2016.2605640

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  79. Survivable Grouped Routing Optical Networks with Dedicated Path Protection Reviewed

    Hasegawa Hiroshi, Mori Yojiro, Sato Ken-ichi

    IEICE TRANSACTIONS ON COMMUNICATIONS   Vol. E99B ( 7 ) page: 1435-1444   2016.7

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    DOI: 10.1587/transcom.2015EBP3482

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  80. Novel Optical-Node Architecture Utilizing Asymmetric-Multiport Wavelength-Selective Switches Invited Reviewed

    Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    IEEE PHOTONICS JOURNAL   Vol. 8 ( 2 )   2016.4

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    DOI: 10.1109/JPHOT.2016.2547838

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  81. Large-Scale and Simple-Configuration Optical Switch Enabled by Asymmetric-Port-Count Subswitches Invited Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    IEEE PHOTONICS JOURNAL   Vol. 8 ( 2 )   2016.4

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    DOI: 10.1109/JPHOT.2016.2529842

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  82. Highly spectral efficient networks based on grouped optical path routing Reviewed

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    OPTICS EXPRESS   Vol. 24 ( 6 ) page: 6213-6228   2016.3

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    DOI: 10.1364/OE.24.006213

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  83. Large-Scale Optical-Switch Prototypes Utilizing Cyclic Arrayed-Waveguide Gratings for Datacenters Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi, Watanabe Toshio

    JOURNAL OF LIGHTWAVE TECHNOLOGY   Vol. 34 ( 2 ) page: 608-617   2016.1

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    DOI: 10.1109/JLT.2015.2489221

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  84. Recent Progress in Large-scale Optical Switches for Intra-datacenter Interconnection Invited Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi

    2016 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS)     page: 2369-2373   2016

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  85. Spectral Efficient Grouped Routing Network that Applies Dynamic Optical Path Grooming Reviewed

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)     page: .   2016

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  86. Experimental Demonstration of 2,160x2,160 Optical Circuit Switch for Intra-datacenter Networking Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Matsuura Hiroyuki, Ishii Kiyo, Kuwatsuka Haruhiko, Namiki Shu, Sato Ken-ichi

    2016 IEEE PHOTONICS CONFERENCE (IPC)     page: 61-62   2016

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  87. Real-time Optical Path Control Method That Utilizes Multiple Support Vector Machines for Traffic Prediction Reviewed

    Kawase Hiroshi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS VIII   Vol. 9773   2016

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    DOI: 10.1117/12.2209463

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  88. Algorithm for raising OXC port count to meet traffic growth at minimum-cost Reviewed

    Sato Kosuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2016

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  89. Highly Reliable and Cost-Effective Large-Scale Optical Cross-Connect Architecture Reviewed

    Yamakami Shuhei, Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2016 IEEE PHOTONICS CONFERENCE (IPC)     page: 558-559   2016

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  90. Demonstration of 720x720 Optical Fast Circuit Switch for Intra-Datacenter Networks Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Matsuura Hiroyuki, Ishii Kiyo, Kuwatsuka Haruhiko, Namiki Shu, Sato Ken-ichi

    NEXT-GENERATION OPTICAL NETWORKS FOR DATA CENTERS AND SHORT-REACH LINKS III   Vol. 9775   2016

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    DOI: 10.1117/12.2211998

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  91. Tipping point for the future scalable OXC -What size MxM WSS is needed?- Reviewed

    Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2016

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  92. Low-Loss and Large-Scale Optical Switch Utilizing Asymmetric-Port-Count Cyclic AWGs Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Moriwaki Osamu

    2016 IEEE 6TH INTERNATIONAL CONFERENCE ON PHOTONICS (ICP)     page: .   2016

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  93. Spectrum Utilization Maximization in Coarse Granular Optical Routing Networks that Employ Fine Granular Shared Protection Reviewed

    Ishikawa Tomohiro, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi

    PROCEEDINGS OF THE 2016 12TH INTERNATIONAL CONFERENCE ON THE DESIGN OF RELIABLE COMMUNICATION NETWORKS (DRCN 2016)     page: 79-86   2016

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  94. Hardware Scale Analysis and Prototype Development of Flexible Waveband Routing OXCs Reviewed

    Ishikawa Tomohiro, Niwa Masaki, Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Subramaniam Suresh, Sato Ken-ichi, Moriwaki Osamu

    2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)     page: .   2016

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  95. Demonstration of 1,440x1,440 Fast Optical Circuit Switch for Datacenter Networking Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Matsuura Hiroyuki, Ishii Kiyo, Kuwatsuka Haruhiko, Namiki Shu, Watanabe Toshio, Sato Ken-ichi

    2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)     page: .   2016

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  96. Polarization-Independent C-Band Tunable Filter Based on Cascaded Si-Wire Asymmetric Mach-Zehnder Interferometer Reviewed

    Suzuki Keijiro, Tanizawa Ken, Suda Satoshi, Matsuura Hiroyuki, Ikeda Kazuhiro, Mori Yojiro, Sato Ken-ichi, Namiki Shu, Kawashima Hitoshi

    2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)     page: .   2016

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  97. Demonstration of Virtual Direct Link Optical Networks Reviewed

    Ito Yusaku, Niwa Masaki, Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2016 IEEE PHOTONICS CONFERENCE (IPC)     page: 552-553   2016

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  98. Highly Spectral Efficient Elastic Optical Network Employing Grouped Optical Path Routing Reviewed

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2016

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  99. Cycle-Slip-Tolerant Decision-Boundary Creation with Machine Learning Reviewed

    Kawase Hiroshi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2016 IEEE 6TH INTERNATIONAL CONFERENCE ON PHOTONICS (ICP)     page: .   2016

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  100. Architecture and Design of Optical Path Networks Utilizing Waveband Virtual Links Reviewed

    Ito Yusaku, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS VIII   Vol. 9773   2016

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    DOI: 10.1117/12.2209466

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  101. Experimental verification of highly scalable OXC that consists of subsystem-modular express-switch part and multicast-switch-based add/drop part enabling total throughput of 314 Tbps Reviewed

    Takashina Shoichi, Ishida Hiroto, Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    OPTICS EXPRESS   Vol. 23 ( 11 ) page: 14796-14805   2015.6

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    DOI: 10.1364/OE.23.014796

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  102. Wavelength-Tunable Filters Utilizing Arrayed Waveguide Gratings for Colorless/Directionless/Contentionless Optical Signal Drop in ROADMs Reviewed

    Takashina Shoichi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-Ichi, Watanabe Toshio

    IEEE PHOTONICS JOURNAL   Vol. 7 ( 1 )   2015.2

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    DOI: 10.1109/JPHOT.2015.2400397

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  103. Novel Network Control Scheme that Can Substantially Reduce Link and Node Costs Simultaneously Reviewed

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    ECOC 2015 41ST EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION     page: .   2015

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  104. Large-Scale Optical Switch with Simplified Sub-Switch Connections for Datacenter Application Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    2015 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)     page: 351-353   2015

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  105. Experimental Demonstration of Multi-Granular Optical-Path Network Utilizing Wavelength/Waveband-Selective Switches Reviewed

    Ueda Koh, Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Miyazawa Takaya, Harai Hiroaki

    2015 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC)     page: .   2015

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  106. Demonstration of Large-Port-Count and Compact ROADM that Exhibits Virtual-C/D/C Performance Reviewed

    Takashina Shoichi, Ishida Hiroto, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2015

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  107. Impairment-aware Optical Multicast Tree Design with Modulation Format Optimization Reviewed

    Deb Soubhik, Hasegawa Hiroshi, Mori Yojiro, Sato Ken-ichi

    2015 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)     page: 250-252   2015

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  108. Shared Protected Grouped Optical Path Routing Network Design Employing Iterative Path Group Relocation Reviewed

    Ishikawa Tomohiro, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2015 7TH INTERNATIONAL WORKSHOP ON RELIABLE NETWORKS DESIGN AND MODELING (RNDM) PROCE4EDINGS     page: 78-84   2015

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  109. A novel optical path routing network that combines coarse granularity optical multicast with fine granularity add/drop and block Reviewed

    Soares Mauro M., Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS VII   Vol. 9388   2015

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    DOI: 10.1117/12.2078561

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  110. Resilient Grouped Routing Optical Networks With Finely Granular Protection Reviewed

    Hasegawa Hiroshi, Mori Yojiro, Sato Ken-ichi

    2015 INTERNATIONAL CONFERENCE ON OPTICAL NETWORK DESIGN AND MODELING (ONDM)     page: 134-139   2015

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  111. Highly Scalable and Compact ROADM Architecture that Exploits MxN Wavelength-Selective Switches Reviewed

    Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2015 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)     page: 127-129   2015

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  112. Residual Capacity Aware Dynamic Control of GRE-based Routing Optical Path Networks under Traffic Growth Model Reviewed

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2015

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  113. Wavelength Path Signalling for WSS/WBSS Combined Optical Switches in Hierarchical Optical Networks Reviewed

    Miyazawa Takaya, Hirayama Takahiro, Harai Hiroaki, Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2015 17th International Conference on Transparent Optical Networks (ICTON)     page: .   2015

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  114. Large-Scale Optical-switch Prototype Compactly Implemented with Novel Functional Configuration Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2015

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  115. Wavelength-tunable Filter Utilizing Non-cyclic Arrayed Waveguide Grating to Create Colorless/Directionless/Contentionless ROADMs Reviewed

    Niwa Masaki, Takashina Shoichi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS VII   Vol. 9388   2015

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    DOI: 10.1117/12.2078522

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  116. Evaluation of Frequency Utilization Enhancement with Transmission-Characteristics-Aware Grouped Optical Path Routing Reviewed

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Tanaka Takafumi

    2015 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS)     page: 256-258   2015

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  117. In-Band Estimation of Optical Signal-to-Noise Ratio From Equalized Signals in Digital Coherent Receivers Reviewed

    Faruk Md Saifuddin, Mori Yojiro, Kikuchi Kazuro

    IEEE PHOTONICS JOURNAL   Vol. 6 ( 1 )   2014.2

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    DOI: 10.1109/JPHOT.2014.2304557

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  118. Photonic networks that exploit digital coherent technologies Invited Reviewed

    Mori Yojiro, Sato Ken-ichi

    OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS VI   Vol. 9008   2014

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    DOI: 10.1117/12.2038657

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  119. Enhancement of Fiber Frequency Utilization by Employing Grouped Optical Path Routing Reviewed

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2014

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  120. Low-loss and Low-power-consumption Wavelength Tunable Filter Enabling Colorless/Directionless/Contentionless Optical Drop in ROADMs Reviewed

    Takashina Shoichi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     page: .   2014

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  121. Estimation of OSNR for Nyquist-WDM Transmission Systems Using Statistical Moments of Equalized Signals in Digital Coherent Receivers Reviewed

    Faruk Md. Saifuddin, Mori Yojiro, Kikuchi Kazuro

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2014

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  122. Low Crosstalk Wavelength Tunable Filter that Utilizes Symmetric and Asymmetric Mach-Zehnder Interferometers Reviewed

    Takashina Shoichi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2014

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  123. Fiber-nonlinearity Limitation of Transmission Distances in Ultra-dense Gridless Photonic Networks Reviewed

    Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2014

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  124. A 204.8 Tbps Throughput 64x64 Optical Cross-Connect Prototype that Allows C/D/C Add/Drop Reviewed

    Takaha Kensuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)     page: .   2014

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  125. Novel Large-port-count Optical-switch Architecture for Optical Interconnection in Datacenter Reviewed

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     page: .   2014

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  126. Verification of High Frequency Spectrum Utilization in Grouped Optical Path Routing Networks under Traffic Growth Scenario Reviewed

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     page: .   2014

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  127. Dual-Stage Decision-Directed Phase Estimator Enabling Perfect Frequency-Offset Elimination in Digital Coherent Optical Receivers Reviewed

    Mori Yojiro, Kikuchi Kazuro

    2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC)     page: .   2013

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  128. Novel configuration of finite-impulse-response filters tolerant to carrier-phase fluctuations in digital coherent optical receivers for higher-order quadrature amplitude modulation signals Reviewed

    Mori Yojiro, Zhang Chao, Kikuchi Kazuro

    OPTICS EXPRESS   Vol. 20 ( 24 ) page: 26236-26251   2012.11

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    DOI: 10.1364/OE.20.026236

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  129. Bit-error Rate Performance of Nyquist Wavelength-Division Multiplexed Quadrature Phase-Shift Keying Optical Signals Reviewed

    Igarashi Koji, Mori Yojiro, Katoh Kazuhiro, Kikuchi Kazuro

    2011 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION (OFC/NFOEC) AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE     page: .   2011

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  130. Second-Order PMD Monitoring from Adaptive FIR-Filter Tap Coefficients in a Digital Coherent Receiver Reviewed

    Faruk Md. Saifuddin, Mori Yojiro, Zhang Chao, Igarashi Koji, Kikuchi Kazuro

    2011 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION (OFC/NFOEC) AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE     page: .   2011

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  131. Multi-impairment monitoring from adaptive finite-impulse-response filters in a digital coherent receiver Reviewed

    Faruk Md. Saifuddin, Mori Yojiro, Zhang Chao, Igarashi Koji, Kikuchi Kazuro

    OPTICS EXPRESS   Vol. 18 ( 26 ) page: 26929-26936   2010.12

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  132. Multi-Impairments Monitoring from the Equalizer in a Digital Coherent Optical Receiver Reviewed

    Faruk Md. Saifuddin, Mori Yojiro, Zhang Chao, Kikuchi Kazuro

    2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2     page: .   2010

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  133. Ultrafast Digital Coherent Receiver Based on Parallel Processing of Decomposed Frequency Subbands Reviewed

    Zhang Chao, Mori Yojiro, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2     page: .   2010

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  134. Proper Polarization Demultiplexing in Coherent Optical Receiver using Constant Modulus Algorithm with Training Mode Reviewed

    Faruk Md. Saifuddin, Mori Yojiro, Zhang Chao, Kikuchi Kazuro

    2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC)     page: 768-769   2010

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    Language:English  

    Web of Science

  135. Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver Reviewed

    Mori Yojiro, Zhang Chao, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    OPTICS EXPRESS   Vol. 17 ( 3 ) page: 1435-1441   2009.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1364/OE.17.001435

    Web of Science

  136. Demodulation of 1.28-Tbit/s Polarization-multiplexed 16-QAM Signals on a Single Carrier with Digital Coherent Receiver Reviewed

    Zhang Chao, Mori Yojiro, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    OFC: 2009 CONFERENCE ON OPTICAL FIBER COMMUNICATION, VOLS 1-5     page: 2059-+   2009

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    Language:English  

    Web of Science

  137. Phase-noise tolerance of optical 16-QAM signals demodulated with decision-directed carrier-phase estimation Reviewed

    Mori Yojiro, Zhang Chao, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    OFC: 2009 CONFERENCE ON OPTICAL FIBER COMMUNICATION, VOLS 1-5     page: 2517-+   2009

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    Language:English  

    Web of Science

  138. 200-km transmission of 100-Gbit/s 32-QAM Dual-Polarization Signals using a Digital Coherent Receiver Reviewed

    Mori Yojiro, Zhang Chao, Usui Masatoshi, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    2009 35TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     page: .   2009

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    Language:English  

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  139. Ultrafast Operation of Digital Coherent Receivers Using Their Time-Division Demultiplexing Function Reviewed

    Zhang Chao, Mori Yojiro, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    JOURNAL OF LIGHTWAVE TECHNOLOGY   Vol. 27 ( 1-4 ) page: 224-232   2009

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/JLT.2008.2010333

    Web of Science

  140. Transmission of 160-Gbit/s QPSK Signals on a Single Carrier over 1,000 km using Digital Coherent Receivers Reviewed

    Zhang Chao, Mori Yojiro, Usui Masatoshi, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    2009 35TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     page: .   2009

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    Language:English  

    Web of Science

  141. Decision-feedback Carrier-phase Estimation for Digital Coherent Optical Receivers Reviewed

    Mori Yojiro, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    2008 JOINT CONFERENCE OF THE OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE AND THE AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY, VOLS 1 AND 2     page: 159-+   2008

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    Web of Science

  142. Demodulation of 320-Gbit/s optical quadrature phase-shift keying signal with digital coherent receiver having time-division demultiplexing function Reviewed

    Kikuchi Kazuro, Igarashi Koji, Mori Yojiro, Zhang Chao

    2008 CONFERENCE ON OPTICAL FIBER COMMUNICATION/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-8     page: 2511-+   2008

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    Web of Science

  143. Transmission of 40-Gbit/s 16-QAM Signal over 100-km Standard Single-mode Fiber using Digital Coherent Optical Receiver Reviewed

    Mori Yojiro, Zhang Chao, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     page: .   2008

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    Language:English  

    Web of Science

  144. Demodulation of 480-Gbit/s 8PSK OTDM Signal with Digital Coherent Receiver Reviewed

    Zhang Chao, Mori Yojiro, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    2008 34TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)     page: .   2008

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    Language:English  

    Web of Science

  145. Unrepeated 200-km Transmission of 40-Gbit/s 16-QAM Signals using Digital Coherent Optical Receiver Reviewed

    Mori Yojiro, Zhang Chao, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    2008 JOINT CONFERENCE OF THE OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE AND THE AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY, VOLS 1 AND 2     page: 666-+   2008

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Presentations 44

  1. Periodic Expansions of Grouped Routing Optical Networks

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    Event date: 2017.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  2. Survivable Grouped Routing Optical Networks

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    Event date: 2017.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  3. Large-Scale Optical Node Architecture in Ultra-Dense WDM Networks

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    Event date: 2017.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  4. Evaluation of large-scale optical cross-connect architectures for creating next generation optical networks cost-effectively

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    Event date: 2017.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  5. Periodic Expansions of Coarse Granular Routing Optical Networks Invited

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    Event date: 2016.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  6. Spectral-Efficiency Maximization using Subcarrier-Multiplexed Signals Defined Adaptively to Distance and Hop Count

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  7. Highly Resilient Optical Cross-Connect Architecture

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  8. Evaluation of Router Power Reduction By Processing Speed Control Utilizing Support Vector Machines

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  9. B-10-20 Highly Reliable Subsystem-Modular Optical Cross-Connect Architecture

    Yamakami Shuhei, Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  10. B-10-75 Large-Scale Optical Node Architecture Utilizing MxM Wavelength-Selective Switches

    Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  11. B-10-21 Node-degree dependency of routing performance of subsystem-modular OXC

    Ito Keisuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  12. Protected Coarse Granular Routing Optical Networks

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    Event date: 2016.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  13. Novel Optical Network Architecture that Achieves Link Capacity Enhancement and Node Hardware Reduction

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    Event date: 2016.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  14. Invited Talk : Report on ECOC2015 : Core Transmission Invited

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    Event date: 2015.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  15. Evaluation of Router Power Reduction By Processing Speed Control Utilizing Support Vector Machines

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  16. Dynamic Control of Large Scale Optical Path Networks Utilizing Grouped Routing Optical Virtual Links

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  17. B-12-8 1600x1600 optical switch enabled by highly dense wavelength routing International conference

    Ueda Koh, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi, Watanabe Toshio

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  18. B-12-9 Large-Scale Optical Node Exploiting MxN Wavelength-Selective Switches

    Niwa Masaki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  19. B-12-17 Periodic Fiber Expansion in Grouped Optical Path Routing Networks

    Terada Yuki, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ich

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  20. B-12-16 Dynamic Optical Path Capacity Adaptation Employing Support Vector Machines

    Kawase Hiroshi, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  21. B-12-14 An Optical Path Network Architecture Employing Waveband Virtual Links

    Ito Yusaku, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  22. B-12-13 Design of Protected Optical Path Networks that consist of Modular Growth Capable OXC Nodes under Traffic Growth Condition

    Sato Kosuke, Mori Yojiro, Hasegawa Hiroshi, Sato Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  23. Report on OFC2015 : Optical Networks Invited

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    Event date: 2015.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  24. Experimental Demonstration of Wavelength Path Signaling for WSS/WBSS Combined Optical Switches in Hierarchical Optical Networks International conference

    MIYAZAWA Takaya, HIRAYAMA Takahiro, HARAI Hiroaki, UEDA Koh, MORI Yojiro, HASEGAWA Hiroshi, SATO Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    Hierarchical optical networks will be a viable solution in creating large-scale core and metro-ring networks of the future. The networks control optical network resources in granularity of both wavelength and waveband that consists of a fixed number of wavelengths; thereby, they can reduce signaling processing load and efficiently create virtual private networks. Meanwhile, as the network scale increases, multi-stage optical switch architecture is effective in reducing hardware scale and cost. In this paper, we develop a distributed wavelength path control plane for large-degree, hierarchical optical networks that consist of OCS nodes made by multi-stage wavelength selective switches (WSSs) and waveband selective switches (WBSSs). Along with the wavelength path signaling, optical switch control functions configure both WBSSs and WSSs. Accordingly, we need to develop optical switch control mechanism so that end-to-end wavelength path establishment/release can correctly configure WBSSs. As experimental results, we show that a wavelength path is successfully established/released.

  25. Fiber Frequency Utilization Enhancement Attained with Grouped Routing Optical Networking Technology

    TERADA Yuki, MORI Yojiro, HASEGAWA Hiroshi, SATO Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    Wide deployment of photonic networks that use WSS-based ROADM nodes causes substantial increase in the number of WSSs traversed by an optical path. This results in a severe impairment by the filter narrowing effect of WSSs. In this paper, we propose a novel frequency assignment and switching strategy named Grouped Routing that can greatly reduce the deficiency stemming from filter narrowing. The proposed Grouped Routing divides the available frequency range for optical paths into several sub-bands. Guard-bands are only inserted between the sub-bands and switching at each node is done with the sub-bands granularity. These sub-bands define pipes that connect nodes on their ways and works as virtual fibers. The omission of guard-band within the pipes can be possible by optimization of spectrum allocation within each band. Numerical experiments demonstrate that the spectral efficiency of the proposed networks is improved by 30%.

  26. B-12-14 Shared Protected Coarse Granular Optical Path Routing Network Design Employing Iterative Relocation

    Ishikawa Tomohiro, Mori Yojiro, Hasegawa Hiroshi, Sato Kenichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2015.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  27. Invited Talk : Report on ECOC2014 : Point-To-Point Transmission Systems Invited

    MORI Yojiro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2014.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    This paper reports the topics of point-to-point transmission, which were presented in ECOC2014 held in Cannes, France, during September 21 to 25, 2014.

  28. Optimum Design Method for Optical Switches Employing Cyclic Arrayed Waveguide Gratings

    UEDA Koh, MORI Yojiro, HASEGAWA Hiroshi, SATO Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    With the rise of novel services such as cloud computing and parallel computing, intra-datacenter traffic is growing rapidly and as a result optical switches that can process such large traffic volume with low latency and low power consumption will play a key role. For optical switches used in datacenter, high-speed switching and port-count scalability are required. Among various optical-switch configurations, a combination of delivery-and-coupling switches and wavelength-routing switches that utilize cyclic arrayed waveguide gratings was proposed. However, the maximum port count of the switch has not yet been discussed quantitatively. In this paper, we clarify the power budgets necessary for two sub-switch parts through numerical evaluations. Based on the simulation results, we optimally allocate the power budget to the two sub-switches and maximize the total switch scale under the practical condition.

  29. Fiber Frequency Utilization Enhancement Attained with Grouped Routing Optical Networking Technology

    TERADA Yuki, MORI Yojiro, HASEGAWA Hiroshi, SATO Ken-ichi

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2014.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    Wide deployment of photonic networks that use WSS-based ROADM nodes causes substantial increase in the number of WSSs traversed by an optical path. This results in a severe impairment by the filter narrowing effect of WSSs. In this paper, we propose a novel frequency assignment and switching strategy named Grouped Routing that can greatly reduce the deficiency stemming from filter narrowing. The proposed Grouped Routing divides the available frequency range for optical paths into several sub-bands. Guard-bands are only inserted between the sub-bands and switching at each node is done with the sub-bands granularity. These sub-bands define pipes that connect nodes on their ways and works as virtual fibers. The omission of guard-band within the pipes can be possible by optimization of spectrum allocation within each band. Numerical experiments demonstrate that the spectral efficiency of the proposed networks is improved by 30%.

  30. B-10-36 Perfect Elimination of Frequency Offset in Digital Coherent Receivers

    MORI Yojiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2012.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  31. B-10-51 Crosstalk Tolerance of Coherent Optical Receivers

    HIRAOKA Daiki, MORI Yojiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  32. B-10-60 Compensation Technique for the Kerr Effect in Digital Coherent Receivers

    MORI Yojiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  33. Novel configuration of FIR filters adapted by the decision-directed LMS algorithm in digital coherent optical receivers

    MORI Yojiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2011.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    We propose a novel configuration of finite-impulse-response (FIR) filters adapted by the decision-directed least-mean-square (DD-LMS) algorithm in digital coherent optical receivers, which enables stable operation under fast carrier-phase fluctuations. Computer simulations show that our scheme is more tolerant to phase noise and the frequency offset compared to the conventional scheme. Such theoretical predictions are also validated experimentally.

  34. B-10-35 Bit-error rates characteristics of Nyquist wavelength-division multiplexed QPSK optical signals

    IGARASHI Koji, MORI Yojiro, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2011.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  35. Ultrafast digital coherent receiver based on subband technique

    ZHANG Chao, MORI Yojiro, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2010.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    The maximum symbol rate at which a digital coherent receiver can process is strictly limited by the operation speed of analog-to-digital converters. This speed limitation can be overcome by parallelization of the signal in advance of electronic analog-to-digital conversion. We have demonstrated that ultrafast optical multilevel-coded signals can be effectively demodulated with parallel optical time sampling. On the other hand, parallelization of the optical signal can also be conducted in the frequency domain. In this case, it is effective to divide signals into multiple subbands. In this article, we propose a digital coherent receiver having the subbanding function and investigate characteristics of such a receiver with computer simulations and experiments.

  36. Ultrafast digital coherent receiver based on subband technique

    ZHANG Chao, MORI Yojiro, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2010.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    The maximum symbol rate at which a digital coherent receiver can process is strictly limited by the operation speed of analog-to-digital converters. This speed limitation can be overcome by parallelization of the signal in advance of electronic analog-to-digital conversion. We have demonstrated that ultrafast optical multilevel-coded signals can be effectively demodulated with parallel optical time sampling. On the other hand, parallelization of the optical signal can also be conducted in the frequency domain. In this case, it is effective to divide signals into multiple subbands. In this article, we propose a digital coherent receiver having the subbanding function and investigate characteristics of such a receiver with computer simulations and experiments.

  37. B-10-76 Ultrafast Digital Coherent Receiver Based on Parallel Processing of Decomposed Frequency Subbands

    ZHANG Chao, MORI Yojiro, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2010.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  38. Nonlinear tolerance of Quadrature-Amplitude-Modulated signals in Digital Coherent Detection

    MORI Yojiro, ZHANG Chao, USUI Masatoshi, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2009.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    The use of multi-level modulation formats is one of the most effective ways of enhancing the spectral efficiency in optical fiber communication systems. Quadrature amplitude modulation (QAM) is the best candidate among various modulation formats, because we can minimize the power penalty due to the increase in the level of modulation. However, such QAM signals require higher power to maintain the symbol distance on the complex plane. In contrast, the maximum optical power that can be launched into the fiber is strictly limited by fiber nonlinearity. In this paper, we demonstrate 1,000-km transmission of 1 -and 3-ch 40-Gbit/s 16-QAM signals, and investigate the impact of nonlinear effects in such a system.

  39. Transmission of 160-Gbit/s QPSK signals on a single carrier over 1,000km using digital coherent receivers

    ZHANG Chao, MORI Yojiro, USUI Masatoshi, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2009.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    The maximum symbol rate that a digital coherent receiver can process is strictly limited by the operation speed of analog-to-digital converters (ADCs). This limitation can be overcome by employing a local oscillator (LO) pulsed at a subharmonic frequency of the symbol rate, which can perform time-division demultiplexing of the signal. In this paper, we demonstrate 1,000-Km transmission of a 80-Gsymbol/s (160Gbit/s) QPSK signal using such a receiver. We successfully demodulate the 160Gbit/s QPSK signal with a bit-error rate (BER) under the forward-error correction (FEC) threshold, and confirm its applicability to long-haul transmission systems.

  40. B-10-72 Demodulation of 480-Gbit/s OTDM-8PSK Signal with Digital Coherent Receiver

    ZHANG Chao, MORI Yojiro, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2008.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  41. B-10-71 Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver

    Mori Yojiro, Zhang Chao, Igarashi Koji, Katoh Kazuhiro, Kikuchi Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2008.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  42. Transmission of 10-Gsymbol/s 16-QAM Signals using Digital Coherent Optical Receiver

    MORI Yojiro, ZHANG Chao, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2008.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    The use of multilevel modulation formats is one of the most effective ways of enhancing the spectral efficiency in optical communication systems. Quadrature amplitude modulation (QAM) is the best candidate among various modulation formats, because we can minimize the power penalty due to the increase in the level of modulation. On the other hand, the digital coherent receiver can demodulate any multi-level coded optical signals without relying upon a complicated optical phase-locked loop. In this paper, using such a digital coherent optical receiver, we demonstrate transmission of a 10-Gsymbol/s 16-QAM signal over a 100-km standard single-mode fiber.

  43. Ultrafast Operation of Digital Coherent Receivers Using Their Optical Time-Division Demultiplexing Function

    ZHANG Chao, MORI Yojiro, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2008.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    The digital coherent receiver realizes phase synchronization in the digital domain and can demodulate any multilevel coded optical signals. However, the maximum symbol rate processed by such receiver is limited by the speed of electric ADCs and DSP. Although real-time operation at 10 Gsymbol/s using a digital coherent receiver has recently been demonstrated, it is still difficult to increase the symbol rate beyond 40 Gsymbol/s. In order to cope with this difficulty, we propose a novel scheme, which employs an LO pulsed at the subharmonic frequency of the symbol rate, enabling optical time-division demultiplexing of the signal at the digital coherent receiver. We demonstrate that the new type of digital coherent receiver operating at 10 Gsymbol/s can demodulate the aggregate symbol rate of 160 Gsymbol/s.

  44. B-10-99 Carrier-phase estimation using adaptive equalization in digital coherent optical receivers

    MORI Yojiro, IGARASHI Koji, KATOH Kazuhiro, KIKUCHI Kazuro

    The Institute of Electronics, Information and Communication Engineers 

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    Event date: 2008.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

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Research Project for Joint Research, Competitive Funding, etc. 2

  1. 次世代ディジタルコヒーレント光ファイバ通信技術の研究開発

    2020.2 - 2021.3

    戦略的情報通信研究開発推進事業(SCOPE) 

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    Grant type:Competitive

  2. 適応制御による長距離且つ大容量フォトニックネットワーク

    2017.4 - 2019.3

KAKENHI (Grants-in-Aid for Scientific Research) 5

  1. 適応制御による超高密度フォトニックネットワークの研究

    2018.4 - 2021.3

    科学研究費補助金 

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    Authorship:Principal investigator 

  2. Highly spectrally efficient photonic networks based on adaptive control

    Grant number:18K13756  2018.4 - 2021.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Mori Yojiro

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    Authorship:Principal investigator 

    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    The amount of data traffic handled by photonic networks is increasing exponentially. Therefore, the capacity of photonic networks needs to be increased. To realize high-capacity networks, it is desirable to introduce ultra-dense wavelength division multiplexing technologies to photonic networks. In such systems, however, the signal quality deteriorates due to spectral narrowing at each optical node, so the transmission distance and the number of node hops are strictly limited. In this research, we achieved a significant improvement in frequency-utilization efficiency based on spectral narrowing compensation, detailed analysis of transmission characteristics, and adaptive network control in ultra-dense wavelength division multiplexing.

  3. データセントリック新世代光ネットワーキングの研究

    2014.5 - 2019.3

    科学研究費補助金  基盤研究(S)

    佐藤健一

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    Authorship:Coinvestigator(s) 

  4. Development of new-generation data-centric optical networks

    Grant number:26220905  2014.5 - 2019.3

    Sato Ken-ichi

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    Authorship:Coinvestigator(s) 

    Making the best use of cutting-edge technologies such as; next-generation spatial division multiplexing on multiple-core fibers, scalable node architectures, advanced optical transmission that can maximally utilize frequency resources of fibers, and network architectures that enable transparent and seamless operations of national-wide and metro-area networks where transmission impairment is substantially reduced, we have achieved substantial network capacity enhancement, high energy efficiency, and excellent frequency utilization in photonic networks where routing operations are effectively conducted in the optical domain. Metrics in each technology, i.e. spatial multiplexing degree, maximum number of nodes that can be traversed by an optical path, maximum fiber degree of node, and frequency utilization efficiency has been substantially expanded so that they exceed the original target values. The product of the metrics yields 2,400 times of the present product value.

  5. フォトニックネットワークにおける伝送限界の追究

    2014.4 - 2016.3

    科学研究費補助金  若手研究(B)

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    Authorship:Principal investigator 

    世界的に増加し続ける光ファイバ通信需要に対応するために,フォトニックネットワークの大規模化および大容量化は早急に達成しなければならない.しかし,光信号の伝送可能な距離および容量は光ファイバの持つ非線形効果によって厳しく制限される.これまで光ノードを経由しない二地点間伝送システムの非線形伝送限界が示されてきたが,光ノードを用いたフォトニックネットワークの伝送限界は未だ明らかでない.このようなシステムの伝送距離および伝送容量は光ノードにおける光フィルタの不完全性がスペクトル狭窄やクロストークを引き起こすため,二地点間伝送システムより厳しく制限される.本研究は,非線形現象および光ノードの影響を同時に考慮することで伝送距離および伝送容量の真の限界を追究するものであり,高機能かつ高性能なフォトニックネットワークを実現するための基礎研究として位置づけられる.

Industrial property rights 3

  1. 光受信装置および光受信装置における光シンボルラベル識別法

    森洋二郎,佐藤健一,長谷川浩,川瀬弘嗣

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    Application no:2016-048519  Date applied:2016.3

    Country of applicant:Domestic  

  2. 光クロスコネクト装置および光クロスコネクト装置の増設方法

    佐藤健一,長谷川浩,森洋二郎,佐藤晃輔

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    Application no:2016-044823  Date applied:2016.3

    Country of applicant:Domestic  

  3. 光スイッチ

    佐藤健一,長谷川浩,森洋二郎,上田恒

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    Application no:2016-015710  Date applied:2016.1

    Country of applicant:Domestic  

 

Teaching Experience (On-campus) 2

  1. 電気・電子工学実験

    2018

  2. 離散数学及び演習

    2018