Polarization manipulation for quality compensation of deteriorated advanced-modulation-format lightwave

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06050
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Communication/Network engineering
• Research Institution: Gunma University
• Principal Investigator: Chiba Akito 群馬大学, 大学院理工学府, 助教 (30435789)
• Co-Investigator(Kenkyū-buntansha): 呂 国偉 東海大学, 創造科学技術研究機構, 准教授 (30599709)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 偏光マニピュレーション

Outline of Final Research Achievements

In this project, we developed a technique to supress a residual carrier component within the modulated lightwave. By combining the linearly-polarized modulation lightwave with the unmodulated lightwave in perpendicular polarization, only polarizaion of the carrier can be selectively manipulated. Using the proposed technique, we achieved 20-dB suppression of parasitic carrier in a modulation lightwave. Also, this technique is further developed to suppress low-order optical sidebands, by applying bidirectional optical modulation into counterpropagating lightwaves. By the developed technique, we succeeded in suppressing the undesired sidebands with the degree of more than 32 dB during more than 8 hours. The paper reporting this scheme and the result is highlighted at "in Brief" on the beginning of the issue, and leads to two invited talks at international conferences.

Free Research Field

光工学