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arXiv · 2608.17419

Fiber Nonlinearity Compensation of Coherent Signals Using Deep Photonic Reservoir Computer

Yi-Wei Shen·Rui-Qian Li·Zheng-Can Sun·Xing Li·Xinyu Liu·Shanshan Yu·Cheng Wang
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Abstract

Photonic reservoir computer (PRC) is a promising optical computing framework for high-speed optical signal processing, and various reports have shown its functionality of linear equalization for intensity-modulation direct-detection communication links. However, coherent communication links suffer more from nonlinear impairment, whereas its nonlinear equalization is very challenging. Here we demonstrate the nonlinear equalization of coherent 16-level quadrature amplitude modulation (16-QAM) signals using a deep PRC in experiment. The deep PRC consists of cascading injection-locked semiconductor lasers with optical feedback loops. For 16-QAM signals with a transmission rate of 240 Gbps and a launch power of 12 dBm, the single-channel PRC with 3 hidden layers raises the Q factor by as high as 0.58 dB, while the dual-channel PRC with 2 hidden layers raises the Q factor by 0.55 dB. In addition, we prove that the deep PRC is able to equalize 16-QAM signals of different launch powers and transmission distances.

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Yi-Wei Shen, Rui-Qian Li, Zheng-Can Sun, Xing Li, Xinyu Liu, Shanshan Yu, Cheng Wang. 2026-08-18. Fiber Nonlinearity Compensation of Coherent Signals Using Deep Photonic Reservoir Computer. https://arxiv.org/abs/2608.17419

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