Trellis-Coded Modulation-Enabled Probabilistic Shaping With Simplified Viterbi Decoder for Bandwidth-Limited IMDD Systems

Han Cui; Zhongliang Sun; Xiaoqian Huang; Du Tang; Fei Xie; Yaojun Qiao

doi:10.1109/JPHOT.2023.3314028

IEEE Photonics Journal (Jan 2023)

Trellis-Coded Modulation-Enabled Probabilistic Shaping With Simplified Viterbi Decoder for Bandwidth-Limited IMDD Systems

Han Cui,
Zhongliang Sun,
Xiaoqian Huang,
Du Tang,
Fei Xie,
Yaojun Qiao

Affiliations

Han Cui: ORCiD; State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Zhongliang Sun: ORCiD; State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Xiaoqian Huang: ORCiD; State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Du Tang: ORCiD; State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Fei Xie: ORCiD; State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Yaojun Qiao: ORCiD; State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China

DOI: https://doi.org/10.1109/JPHOT.2023.3314028
Journal volume & issue: Vol. 15, no. 5
pp. 1 – 10

Abstract

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In this article, trellis-coded modulation-enabled probabilistic shaping (TEPS) scheme with a simplified Viterbi decoder is proposed. Trellis-coded modulation (TCM) is embedded in the probabilistic shaping (PS) technique to improve the performance of PS signals in bandwidth-limited intensity modulation and direct detection (IMDD) systems. Further, to reduce the calculation complexity of TCM decoding, the constellation partition decision-assisted (CPDA)-Viterbi decoder is proposed which decides the received signal before decoding to reduce the branches. To verify the performance of the proposed scheme, a 32-GBaud TEPS-four-level pulse-amplitude modulation (PAM4) experimental system with 10G-class O-band directly-modulated laser (DML) is built over a 20-km standard single-mode fiber (SSMF) transmission link. The experimental results show that TEPS-PAM4 achieved up to 1.80-dB higher receiver sensitivity than PS-PAM4 at 7% forward error correction (FEC) limit with the same net rate. Moreover, with the multiplications reduced by up to 45.7% compared with the Viterbi decoder, TEPS-PAM4 with CPDA-Viterbi decoder has up to 1.50-dB higher receiver sensitivity limit than PS-PAM4 at 7% FEC.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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