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Fast-Convergence Burst-Mode Digital Signal Processing for Coherent Passive Optical Networks
  • +11
  • Haide Wang ,
  • Ji Zhou ,
  • Zhenping Xing ,
  • Qiguang Feng ,
  • Kuo Zhang ,
  • Keshuang Zheng ,
  • Xi Chen ,
  • Tao Gui ,
  • Liangchuan Li ,
  • Jianrui Zeng ,
  • Jinyang Yang ,
  • Weiping Liu ,
  • Changyuan Yu ,
  • Zhaohui Li
Haide Wang
College of Information Science and Technology, College of Information Science and Technology

Corresponding Author:[email protected]

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Zhenping Xing
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Qiguang Feng
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Kuo Zhang
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Keshuang Zheng
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Liangchuan Li
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Jianrui Zeng
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Jinyang Yang
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Weiping Liu
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Changyuan Yu
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Zhaohui Li
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Abstract

Optical access networks have been evolving to meet the explosive growth of data traffic. It is foreseeable that the 100Gb/s/λ and beyond passive optical network (PON) will be required in future optical access networks. Coherent optical communication is a promising solution for the future beyond 100G PON. However, the traditional digital signal processing (DSP) for coherent optical communication is difficult to realize fast convergence due to blind and complex algorithms. In this paper, we design a specific preamble structure and propose a burst-mode DSP to achieve fast convergence for the coherent PON. For verifying the feasibility of the proposed scheme, point-to-multi-point (P2MP) coherent PON is experimentally built up based on digital subcarrier multiplexing (DSCM), which is a kind of frequency division multiple access. When the allocated frequency of the optical network unit is suddenly changed, the DSP should converge fast to ensure a low handoff latency. In P2MP coherent PON, the proposed specific preamble structure and burst-mode DSP jointly implement the fast convergence using a short preamble with only 416 symbols. The experimental results show that the 8-Gbaud/SC×8-SCs 400Gb/s-net-rate coherent PON in burst-mode detection achieves the receiver sensitivity of approximately −27dBm at the 20% soft-decision forward error correction limit and approximately 35.5dB optical power budget with an optical pre-amplifier.
15 Jul 2023Published in Journal of Lightwave Technology volume 41 issue 14 on pages 4635-4643. 10.1109/JLT.2023.3243828