Optical Subcarrier Processing for Nyquist SCM Signals using Four-Wave Mixing with Coherent Pumps

2021 Fiscal Year Final Research Report

• Project/Area Number: 18K04152
• 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: The University of Aizu (2020-2021); Tokai University (2018-2019)
• Principal Investigator: Lu Guo-Wei 会津大学, コンピュータ理工学部, 上級准教授 (30599709)
• Co-Investigator(Kenkyū-buntansha): 千葉 明人 群馬大学, 大学院理工学府, 助教 (30435789) ; 坂本 高秀 国立研究開発法人情報通信研究機構, ネットワークシステム研究所ネットワーク基盤研究室, 主任研究員 (70392727)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Keywords: optical communications / four-wave mixing / nonlinear optics

Outline of Final Research Achievements

The main research output of this project could be summarized below. (a) subcarrier multicast and data aggregation with coherent detections; (b) synthesis of high-order quadrature-amplitude modulation (QAM) subcarrier from input low-order QAM twin-SSBs by coherent superposition with direct detection. In addition, a specific algorithm named hierarchical blind phase search was proposed and developed to cope with the imperfect phase rotation in the coherent superposition process. In both cases, error-free operations and clear constellations were experimentally demonstrated for the synthesized high-order subcarrier with either coherent or direct detection, verifying the proposed scheme.

Free Research Field

Optical Communications

Academic Significance and Societal Importance of the Research Achievements

The proposed processing schemes would be helpful for effectively managing the subcarrier granularity in subcarrier multiplexing systems, offering a flexible and efficient spectrum management, enabling the adaptive cross-connection in in-band level, and eventually realizing agile optical networks.