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

Weihao Ni; Fan Li; Mingzhu Yin; Zhiwei Chen; Wei Wang; Dongdong Zou; Yi Cai; Qi Sui; Zhaohui Li; Zhaohui Li

doi:10.1364/OL.469838

Optics Letters
Vol. 47,
Issue 17,
pp. 4387-4390
(2022)
•https://doi.org/10.1364/OL.469838

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

Weihao Ni, Fan Li, Mingzhu Yin, Zhiwei Chen, Wei Wang, Dongdong Zou, Yi Cai, Qi Sui, and Zhaohui Li

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Weihao Ni, Fan Li, Mingzhu Yin, Zhiwei Chen, Wei Wang, Dongdong Zou, Yi Cai, Qi Sui, and Zhaohui Li, "Decision region partition aided MLSE for O-band 65-Gbaud PAM-4 system over 40-km transmission with a severe bandwidth constraint," Opt. Lett. 47, 4387-4390 (2022)

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Table of Contents Category
- Fiber Optics and Optical Communications
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About this Article
History
- Original Manuscript: July 6, 2022
- Revised Manuscript: July 29, 2022
- Manuscript Accepted: August 4, 2022
- Published: August 23, 2022

Abstract

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.

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	Conventional MLSE	DRP-MLSE	Reduction Percentage
Total number of multiplications	$N \times L \times 4^{L + 1}$	$P \times N \times L \times 2^{L + 1}$	$1 - P / 2^{L + 1}$
Total number of additions	$N \times (L + 2) \times 4^{L + 1}$	$P \times N \times (L + 2) \times 2^{L + 1}$	$1 - P / 2^{L + 1}$
Total computational complexity	$(2 \times L + 2) \times N \times 4^{L + 1}$	$P \times (2 \times L + 2) \times N \times 2^{L + 1}$	$1 - P / 2^{L + 1}$

	Conventional MLSE	DRP-MLSE	Reduction Percentage
Total number of multiplications	$N \times L \times 4^{L + 1}$	$P \times N \times L \times 2^{L + 1}$	$1 - P / 2^{L + 1}$
Total number of additions	$N \times (L + 2) \times 4^{L + 1}$	$P \times N \times (L + 2) \times 2^{L + 1}$	$1 - P / 2^{L + 1}$
Total computational complexity	$(2 \times L + 2) \times N \times 4^{L + 1}$	$P \times (2 \times L + 2) \times N \times 2^{L + 1}$	$1 - P / 2^{L + 1}$

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