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A mean-removal multipath interference estimation scheme for optical interconnection

delete2025-12-04
delete0
PRE
AI
J
Jun Ming
董
董泽 (Ze Dong) *
S
Shaonan Liu
H
Hailian He
Y
Yucai Tian
Y
Yujia Mu
R
Rui Wang
Y
Yuyao Wen
Z
Zhipei Li
R
Ran Gao
X
Xiangjun Xin
DOI：10.1016/j.optlastec.2025.114275delete
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Abstract

Abstract

En 中文
We propose and experimentally validate a mean-removal multipath interference estimation (MRME) scheme in intensity-modulation direct-detection 4-level pulse amplitude modulation (PAM4) optical interconnection. Departing from classical decision-directed least mean square (DD-LMS) methods of restricted efficacy in multipath interference (MPI) compensating due to inaccurate symbol decision influenced by instantaneous amplitude fluctuation, the proposed MRME scheme suppresses such amplitude fluctuation by using a simple sliding window based on symbol averaging. By leveraging symbol fluctuation characteristic, this offset extraction mechanism achieves superior MPI robustness compared to adaptively equalized schemes, delivering enhanced convergence behaviour in MPI equalization. Experimental validation demonstrates 120-Gb/s PAM4 interconnection over 2-km standard single-mode fiber, yielding a signal-to-interference power ratio (SIPR) gain of up to 4.1 dB at the feedforward error correction limit (BER = 3.8 × 10−3) compared to the biased-DD-LMS scheme.

Journal

O
optics & laser technology
IF:
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Papers:
880
Citations:
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