Quantum Detection of Wavelength Division Multiplexing Optical Coherent Signals in Lossy Channels

A. Waseda, M. Sasaki, M. Takeoka, M. Fujiwara, M. Toyoshima, Hidema Tanaka
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引用次数: 11

Abstract

We numerically evaluate the wavelength division multiplexing (WDM) data transmission of coherent phase-shift keying (PSK) and quadrature amplitude modulation (QAM) signals in optical fiber communication and deep-space communication channels with conventional homodyne-based(dyne-type) detections and various quantum detection strategies. We show the quantitative gap between these detection strategies and especially in the quantum-limited region where the quantum noise seriously limits the transmission rate. For an extremely weak signal input power, there is a crucial gap between the capacity limit and the transmission rates of the WDM system with dyne-type detections. We show that this gap is filled by applying a collective square root detection (SRD) only for each channel, not necessary for quantum collective decoding among WDM channels.
损耗信道中波分复用光相干信号的量子检测
我们在光纤通信和深空通信信道中,采用传统的基于纯差的(达因型)检测和各种量子检测策略,对相干相移键控(PSK)和正交调幅(QAM)信号的波分复用(WDM)数据传输进行了数值评估。我们展示了这些检测策略之间的定量差距,特别是在量子限制区域,量子噪声严重限制了传输速率。对于极弱的信号输入功率,具有达因型检测的WDM系统的容量极限与传输速率之间存在着至关重要的差距。我们表明,通过仅对每个信道应用集体平方根检测(SRD)来填补这一空白,这对于WDM信道之间的量子集体解码是不必要的。
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