Decision region partition aided MLSE for O-band 65-Gbaud PAM-4 system over 40-km transmission with a severe bandwidth constraint

Maximum likelihood sequence estimation (MLSE) is an optimal solution to realize sequence detection in the digital signal processing (DSP) of short reach O-band intensity modulation/direct detection (IM/DD) systems with bandwidth limitation. However, traditional MLSE requires relatively high computat...

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Bibliographic Details
Published in:Optics letters 2022-09, Vol.47 (17), p.4387-4390
Main Authors: Ni, Weihao, Li, Fan, Yin, Mingzhu, Chen, Zhiwei, Wang, Wei, Zou, Dongdong, Cai, Yi, Sui, Qi, Li, Zhaohui
Format: Article
Language:English
Subjects:
Bandwidths
Complexity
Digital signal processing
Maximum likelihood estimation
Optical interconnects
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Summary:Maximum likelihood sequence estimation (MLSE) is an optimal solution to realize sequence detection in the digital signal processing (DSP) of short reach O-band intensity modulation/direct detection (IM/DD) systems with bandwidth limitation. However, traditional MLSE requires relatively high computational complexity for short reach optical interconnect. Although the computational complexity of single-symbol sequence detection is quite low, the capability of combating with the inter symbol interference (ISI) is inadequate. To combine the low computational complexity of single-symbol sequence detection with the high reliability of multi-symbol sequence detection in MLSE, decision region partition aided MLSE (DRP-MLSE) is proposed and verified with 60-Gbaud and 65-Gbaud PAM-4 IM/DD systems over 40-km single-mode fiber (SMF) transmission. The experimental results show that the DRP-MLSE can realize similar performance of conventional MLSE with negligible penalty and significantly lower computational complexity.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.469838