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Studies on optical node with modulation format and wavelength channel number conversion technology for low latency in optical communication network

Research Project

Project/Area Number 19K14985
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 21020:Communication and network engineering-related
Research InstitutionThe University of Tokushima

Principal Investigator

KISHIKAWA Hiroki  徳島大学, 大学院社会産業理工学研究部(理工学域), 准教授 (00759722)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords光通信 / 変調方式 / 4相位相変調 / 16相直交振幅変調 / 遅延干渉計 / 相互偏波変調 / 8相直交振幅変調 / オンオフキーイング / 四光波混合 / 位相感応増幅 / 自己位相変調 / 利得飽和 / 4相位相シフトキーイング / 光通信ネットワーク / 低遅延
Outline of Research at the Start

情報通信技術の利活用が広まるに従い注目されるようになった問題にネットワークの遅延がある。次世代の移動通信方式である「5G」では遅延は1ミリ秒以下を目標とするが、これは無線区間のみにおける値であり、有線光通信ネットワークを介したサーバとのやりとりにかかる遅延時間は考慮されておらず、場合によっては往復通信で100ミリ秒程度の遅延が想定される。本研究では、ネットワーク間接続光ノードにおける処理遅延を1000分の1程度に低減するため、変調方式変換技術を確立することを目的とする。

Outline of Final Research Achievements

The objective of this research is to establish modulation format and wavelength channel number conversion technology to reduce the processing delay by a factor of about 1/1000 at the optical node connecting optical networks. Among several research themes, we have studied a conversion technique using optical signal processing techniques and electro-optic effects, especially for the conversion from quadrature phase-shift keying (QPSK) to 16-ary quadrature amplitude modulation (16QAM), which will be applied in future terabit-class transmission. The implementation method, conversion characteristics, and signal quality of the proposed method were clarified by computer simulation. The numerical target of the conversion characteristics is achieved with a delay time of less than 5 microseconds, and error-free optical signal transmission can be achieved by using the error correction technique.

Academic Significance and Societal Importance of the Research Achievements

光通信網のノードでは、到着光信号を電気信号に変換し、宛先識別、経路選択、衝突回避等を施し、電気信号を光信号に変換して送信するという手順をとるため、処理遅延が問題となる。本成果は、送受信機における光信号と電気信号の変換部を無くし、更に光学的に信号処理を行うことで遅延を低減するための要素技術である。従来法は高非線形ファイバ等の非線形光学効果を用いた制御が行われており、消費電力や装置の複雑化といった問題があったが、本成果は受動デバイスで構成する簡易な変換技術であり、省電力かつ高効率である点に特色がある。多くの産業で将来利用が期待される遠隔操作や自動操縦といった情報通信技術の活用が広がると期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2021 2020 2019

All Presentation (5 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Presentation] All-Optical Modulation Format Conversion From DQPSK to OOK Using Cross-Polarization Modulation2021

    • Author(s)
      Kouki Iwama, Hiroki Kishikawa, Nobuo Goto, Jun-ichi Fujikata
    • Organizer
      The Annual Conference of the IEEE Photonics Society (IPC2021), No.WC4.4, Online, Oct. 2021.
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Modulation Format Conversion for Flexible and Spectrally Efficient Transmission2020

    • Author(s)
      Hiroki Kishikawa and Nobuo Goto
    • Organizer
      25th OptoElectronics and Communications Conference 2020 (OECC2020), No.T2-3.1, Taipei, Oct. 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Simple DQPSK Receiver Based on Format Conversion From DQPSK to 4PAM by Using a Delay Line Interferometer and a Photo Detector2020

    • Author(s)
      Tomoki Amano, Hiroki Kishikawa and Nobuo Goto
    • Organizer
      25th OptoElectronics and Communications Conference 2020 (OECC2020), No.VP76, Taipei, Oct. 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Consideration of All-Optical Modulation Format Conversion from BPSK to QPSK in Free-Space Communication Using OAM Beam2019

    • Author(s)
      Kohshi Fujiwara, Hiroki Kishikawa and Nobuo Goto
    • Organizer
      24th MicroOptics Conference (MOC2019), Toyama, No.P-61, Toyama, Nov. 2019.
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Modulation Format Conversion Between QPSK, OOK and 8QAM Using Optical Nonlinear Effects2019

    • Author(s)
      Hiroki Kishikawa, Masaki Uetai and Nobuo Goto
    • Organizer
      24th MicroOptics Conference (MOC2019), Toyama, No.P-15, Toyama, Nov. 2019.
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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