Single Wavelength 200 Gbit/s Downlink Optical Access System based on VDFE-RLS

HE Ting; LI Xiang; LI Jie; LUO Ming

doi:10.13756/j.gtxyj.2024.230136

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Single Wavelength 200 Gbit/s Downlink Optical Access System based on VDFE-RLS

更新时间：2024-02-19

- Single Wavelength 200 Gbit/s Downlink Optical Access System based on VDFE-RLS
- Study on Optical Communications Issue 1, Pages: 23013601-23013607(2024)
- 作者机构：
  
  1.中国地质大学　机械与电子信息学院，武汉　430074
  2.中国信息通信科技集团有限公司　光纤通信技术和网络全国重点实验室，武汉　430074
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2024.230136
  CLC： TN915.6
- Published：10 February 2024，
  
  Received：24 August 2023，
  
  Revised：11 September 2023，
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何婷，李响，李婕，等. 基于VDFE-RLS均衡器的单波长200 Gbit/s光接入系统[J]. 光通信研究，2024(1)：230136.

He T, Li X, Li J, et al. Single Wavelength 200 Gbit/s Downlink Optical Access System based on Volterra Decision Feedback Equalizer [J]. Study on Optical Communications，2024(1)：230136.
何婷，李响，李婕，等. 基于VDFE-RLS均衡器的单波长200 Gbit/s光接入系统[J]. 光通信研究，2024(1)：230136. DOI： 10.13756/j.gtxyj.2024.230136.

He T, Li X, Li J, et al. Single Wavelength 200 Gbit/s Downlink Optical Access System based on Volterra Decision Feedback Equalizer [J]. Study on Optical Communications，2024(1)：230136. DOI： 10.13756/j.gtxyj.2024.230136.

摘要

【目的】

高速无源光接入网络中存在光纤色散、非线性损伤和带宽限制等问题，导致传统强度调制和直接检测技术的功率预算损失较高，难以满足高速无源光接入网络的要求。

【方法】

为了更好地提升强度调制和直接检测光接入系统的速率和性能，文章在Volterra判决反馈均衡器（VDFE）的基础上，研究了基于递推最小二乘估计（RLS）算法的VDFE-RLS信道均衡方法。该均衡器采用RLS算法对其中的抽头系数进行更新。该均衡器包含了一、二、三阶Volterra级数，其中一阶Volterra级数对线性损伤进行补偿，二阶和三阶Volterra级数能够对非线性损伤进行补偿。文章将该均衡器应用于经过20 km传输后的单波长为200 Gbit/s的O波段强度调制和直接检测技术的下行光接入系统中。

【结果】

实验结果表明，RLS算法相比传统的最小均方（LMS）算法在均衡器中表现出来的性能更好。此外，VDFE-RLS可以实现>29 dB的功率预算。VDFE-RLS相比于传统的基于Volterra的前馈均衡器（VFFE），当VDFE-RLS和VFFE-RLS均衡器长度相同时，可以实现2.2 dB功率预算的提升。当VDFE-RLS的均衡器长度为VFFE-RLS的一半时，前者相比后者仍可以提升0.5 dB的功率预算。

【结论】

文章所述系统相比其他传统系统在能够缩短均衡器长度的同时，能提高系统的功率预算，还能最终恢复出准确度较高的信号。

Abstract

【Objective】

Optical fiber dispersion

nonlinear impairments

and bandwidth limitation in high-speed passive optical access networks result in significant power budget loss with traditional intensity modulation and direct detection schemes

failing to meet the requirements of high-speed passive optical access networks.

【Methods】

In order to enhance the rate and performance of the intensity modulation and direct detection optical access system

this study explores the channel equalization method of VDFE-RLS based on Recursive Least Squares (RLS) algorithm

building upon the Volterra Decision Feedback Equalizer (VDFE)

This equalizer uses RLS algorithm to update its tap coefficients. It includes a three-order Volterra series

allowing it to compensate for both linear and nonlinear impairments. VDFE-RLS is applied to the downlink optical access system with a single wavelength of 200 Gbit/s based on O-band intensity modulation and direct detection scheme after 20 km transmission.

【Results】

The experimental results show that the RLS outperforms the conventional Least Mean Square (LMS) algorithm in the equalization process. Moreover

VDFE-RLS achieves a power budget greater than 29 dB. When the length of the equalizer is the same

VDFE-RLS can increase the power budget by 2.2 dB compared with the conventional Volterra Feed Forward Equalization (VFFE)-RLS equalizer. When the length of VDFE-RLS equalizer is half that of VFFE-RLS

the VDFE-RLS can increase the power budget by 0.5 dB compared with the VFFE-RLS equalizer.

【Conclusion】

Compared with other traditional methods

the proposed method can shorten the length of the equalizer and increase the power budget of the system

ultimately restoring signals with better performance.

关键词

Volterra判决反馈均衡器递推最小二乘估计Volterra级数自适应滤波算法

Keywords

VDFERLSVolterra seriesadaptive filtering algorithms

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