An Improved EEPN Compensation Algorithm in High-speed Coherent Optical Communication

LIU Qun

doi:10.13756/j.gtxyj.2025.240093

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An Improved EEPN Compensation Algorithm in High-speed Coherent Optical Communication

更新时间：2025-10-15

- An Improved EEPN Compensation Algorithm in High-speed Coherent Optical Communication
- Study on Optical Communications Issue 5, (2025)
- 作者机构：
  
  四川财经职业学院　信息学院，成都　610101
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2025.240093
  CLC： TN929.11
- Received：14 May 2024，
  
  Revised：2024-06-11，
  
  Published：10 October 2025
- 稿件说明：
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刘群. 高速相干光通信中一种改进的EEPN补偿算法[J]. 光通信研究，2025(5): 240093.

Liu Q. An Improved EEPN Compensation Algorithm in High-speed Coherent Optical Communication[J]. Study on Optical Communications, 2025(5): 240093.
刘群. 高速相干光通信中一种改进的EEPN补偿算法[J]. 光通信研究，2025(5): 240093. DOI： 10.13756/j.gtxyj.2025.240093.

Liu Q. An Improved EEPN Compensation Algorithm in High-speed Coherent Optical Communication[J]. Study on Optical Communications, 2025(5): 240093. DOI： 10.13756/j.gtxyj.2025.240093.

摘要

【目的】

均衡增强相位噪声（EEPN）是限制高速相干光通信中传输距离提高的主要因素之一，为了减少EEPN的影响，进一步提高光传输距离，需要基于1/

（

表示频率）相位噪声模型对比EEPN效应对传输距离的影响。同时，为了减少EEPN代价，文章提出了一种改进的EEPN补偿算法，并进行了仿真对比。

【方法】

文章通过理论分析，给出了EEPN研究时1/

相位噪声模型的建模方法，并针对现有数字子载波联合的相位噪声补偿算法在大色散无收益的问题，提出了一种新颖的基于多子载波联合与色散走离对消的改进算法。文章利用Matlab仿真软件对比了不同1/

相位噪声模型下EEPN代价差异和改进方案的性能收益。

【结果】

结合理论分析和仿真对比不同1/

相位噪声曲线，结果表明，低频相位噪声越小、线宽越小，EEPN越低。改进的EEPN补偿算法在不同色散下均能看到明显的性能收益，在20 000和30 000 ps/nm下，性能收益分别在0.2和0.3 dB左右。

【结论】

除减少激光器线宽外，减少激光器低频相位噪声也是改善EEPN代价的一种有效方式，同时，改进的相位噪声估计方法克服了现有算法在大色散下无收益的问题，这对进一步提高光传输距离具有重大意义。

Abstract

【Objective】

Equalization Enhanced Phase Noise (EEPN) is one of the main factors limiting the increase in transmission distance in high-speed coherent optical communication. In order to reduce the impact of EEPN

it is necessary to compare the impact of EEPN effect on transmission distance based on a 1/

(

represents frequency) phase noise model. At the same time

in order to reduce the penalty of EEPN

an improved EEPN compensation algorithm was proposed and compared through simulation.

【Methods】

A modeling method for the 1/

phase noise model was proposed through theoretical analysis. To address the lack of benefit from existing digital subcarrier-combined phase-noise compensation algorithms under large accumulated dispersion

this paper proposes a novel enhanced scheme that jointly exploits multi-subcarrier cooperation and dispersion-walk-off cancellation. Matlab simulations are employed to compare the EEPN penalties under different 1/f phase-noise models and to quantify the performance gains of the proposed improvement.

【Results】

Combining theoretical analysis and simulation comparison of different 1/

phase noise curves

the results show that the smaller the low-frequency phase noise and line width

the lower the EEPN. The improved EEPN compensation algorithm shows significant performance benefits under different dispersion levels

with performance benefits of around 0.2 and 0.3 dB at 20 000 and 30 000 ps/nm.

【Conclusion】

In addition to reducing the linewidth of the laser

reducing the low-frequency phase noise of the laser is an effective way to reduce the penalty of EEPN. Meanwhile

the enhanced phase-noise estimation method overcomes the ineffectiveness of existing algorithms under high dispersion

offering significant potential for extending optical-transmission reach.

关键词

Keywords

references

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