Super-Nyquist WDM technique for high-order QAM signals

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630161
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electron device/Electronic equipment
• Research Institution: Osaka University
• Principal Investigator: Igarashi Koji 大阪大学, 工学(系)研究科(研究院), 准教授 (80436534)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 超大容量伝送 / スペクトル整形 / 信号処理 / 波長多重

Outline of Final Research Achievements

We numerically and experimentally evaluated performance of polybinary shaping for optical high-order quadrature amplitude modulated signals in the Super-Nyquist wavelength-division multiplexed (WDM) system, in which WDM spacing is smaller than the baudrate of the signal, resulting in the extremely high spectral efficiency. The polybinary shaping technique is effective for optimization between spectral efficiency and required signal-to-noise ratio corresponding to the target transmission lenght. In addition, we applied the Super-Nyquist WDM technique to space-division multiplexed fiber transmission. The trasnmission capacity over 2 Pbeit/s was achieved for the first time, and the record spectral efficiency of 456 bit/s/Hz was achieved.

Free Research Field

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