Study on precise optical phase control technique by employing a wideband optical voltage controlled oscillator for coherent optical communication

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630168
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Communication/Network engineering
• Research Institution: Tohoku University
• Principal Investigator: KASAI KEISUKE 東北大学, 電気通信研究所, 助教 (80534495)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 信号処理 / 光PLL / 音響光学変調器 / コヒーレント光通信

Outline of Final Research Achievements

With the aim of applying to ultra-multilevel coherent optical communication, I have developed a wideband, narrow linewidth optical voltage controller (OVCO) by using an acousto-optic modulator (AOM) and a narrow linewidth laser. By employing a InP-based AOM, I have realized a wideband OVCO with a 0.1 dB-frequency response bandwidth of ±2.5 MHz. With an optical phase-locked loop (PLL) circuit consisting of the present OVCO and a 1.5 um narrow linewidth fiber laser, which enables us to realize carrier phase synchronization between the transmitted data and the LO signal, I have successfully transmitted a 120 Gbit/s 64 QAM data over 150 km. This is the first time coherent transmission with an AOM-based OVCO-PLL system.

Free Research Field

光通信工学