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Fast-Convergence Digital Signal Processing for Coherent PON using Digital SCM
  • +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

It is foreseeable that the 100 Gb/s/λ and beyond passive optical network (PON) will be required in future optical access networks to meet the explosive growth of data traffic. The coherent optical systems could be a promising solution for the future beyond 100G PON. Coherent PON using digital subcarrier multiplexing (DSCM) can provide flexible bandwidth allocation to a large number of access subscribers by dividing subcarriers of the DSCM signal into time slots for time-and-frequency division multiple access. When the optical network unit is allocated a new subcarrier, digital signal processing (DSP) should converge fast in the allocated time slot to ensure a low handoff latency for real-time bandwidth allocation. However, the traditional coherent DSP is hard to realize fast convergence due to blind and complex algorithms. In this paper, we design a specific training sequence (TS) structure and propose data-aided DSP to achieve fast convergence for coherent PON. The feasibility of the proposed scheme is experimentally verified in an  8 Gbaud/SC×8 SCs 400 Gb/s-net-rate coherent PON using DSCM with 16 quadrature amplitude modulation. The experimental results show that fast convergence is jointly realized by the proposed TS structure and data-aided DSP using a 416-symbol TS with a 52 ns duration. The receiver sensitivity at the 20% soft-decision forward error correction limit is approximately −27 dBm and an optical power budget of about 35.5 dB is achieved with a booster amplifier.
15 Jul 2023Published in Journal of Lightwave Technology volume 41 issue 14 on pages 4635-4643. 10.1109/JLT.2023.3243828