Fast-Convergence Digital Signal Processing for Coherent PON Using Digital SCM

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

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 100 G 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.

Original languageEnglish
Article number10042001
Pages (from-to)4635-4643
Number of pages9
JournalJournal of Lightwave Technology
Volume41
Issue number14
DOIs
Publication statusPublished - 15 Jul 2023

Keywords

  • Coherent passive optical network
  • data-aided algorithms
  • digital subcarrier multiplexing
  • fast-convergence digital signal processing
  • specific training sequence structure

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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