Long-distance coherent repeatered transmission of multivalue modulated optical signals

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K06424
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Communication/Network engineering
• Research Institution: Wakayama University
• Principal Investigator: Matsumoto Masayuki 和歌山大学, システム工学部, 教授 (10181786)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 光ファイバ通信 / コヒーレント光通信 / 光位相共役 / 光信号再生

Outline of Final Research Achievements

This study proposes a simple scheme for extending transmission distance of multivalued optical signals without resorting to high-speed analog-to-digital conversion and large-scale digital signal processing. The scheme uses an opto-electrical signal regenerator consisting of optical homodyne detection together with analog electrical signal processing and an intradyne opto-electrical signal phase conjugator in combination.
In this project, a novel method of generating optically phase-locked local oscillator light for homodyne detection is proposed and studied, and dispersion and nonlinearity compensation performance of an indradyne opto-electrical signal conjugator is demonstrated.

Free Research Field

光通信工学

Academic Significance and Societal Importance of the Research Achievements

基幹伝送系に導入が進みつつあるデジタルコヒーレント光伝送方式は、分散補償などの信号処理を電気領域において柔軟に行えるという利点をもつ一方、信号処理遅延や消費電力が大きいという欠点をもつ。伝送路中に複数回設置されることになる信号再生中継装置においてこの方式を採用する場合、これらの欠点が問題となる。本研究では、高速アナログ―デジタル変換や大規模のデジタル信号処理に頼らない、シンプルな信号再生中継装置の実現を目指した。