Optical coherent detection based on phase retrieval

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04384
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: National Institute of Information and Communications Technology
• Principal Investigator: Yoshida Yuki 国立研究開発法人情報通信研究機構, ネットワーク研究所フォトニックICT研究センター, 主任研究員 (50573036)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 光コヒーレント通信 / 位相回復 / 光信号品質評価

Outline of Final Research Achievements

Towards an ultra-compact coherent transceiver solution, a novel optical coherent detection technique only by using a high-speed photodetector array has been proposed based on the idea of phase retrieval (PR). The optical phase information is reconstructed computationally from the scattering pattern of the received signal via PR; neither a local light nor an optical hybrid is needed.
We developed a low-complexity and robust RR algorithm and demonstrated the carrier-less detection of optical QPSK, 16QAM, and OFDM signals experimentally. In addition, the proposed PR-based coherent detection has been adopted to the optical signal monitoring. The proposed single-pixel optical modulation analyzer was demonstrated experimentally with a 400Gbps DP-16QAM signal.

Free Research Field

光ファイバ通信

Academic Significance and Societal Importance of the Research Achievements

基幹系光ファイバ伝送システムでは，光の強度だけでなく位相にも情報をのせることで超高速伝送を実現するが，光位相情報の検出，すなわちコヒーレント受信には，高精度なレーザ光源や複雑な光集積回路が必要となる．本研究ではこうした複雑な光デバイスを廃し，計算的に光位相を検出する新たな受信方式を提案した．提案手法により，光コヒーレント受信機の小型・簡素化が期待でき，今後，光コヒーレント方式による超高速光伝送システムが，アクセス系など我々のより身近なところに応用するための要素技術となることが期待される．