Decoding of 10-G Optics-Based 50-Gb&#x002F;s PAM-4 Signal Using Simplified MLSE

Tingting Xu; Zhengxuan Li; Junjie Peng; Acai Tan; Yingxiong Song; Yingchun Li; Jian Chen; Min Wang

doi:10.1109/JPHOT.2018.2850778

IEEE Photonics Journal (Jan 2018)

Decoding of 10-G Optics-Based 50-Gb/s PAM-4 Signal Using Simplified MLSE

Tingting Xu,
Zhengxuan Li,
Junjie Peng,
Acai Tan,
Yingxiong Song,
Yingchun Li,
Jian Chen,
Min Wang

Affiliations

Tingting Xu: ORCiD; Key Laboratory of Specialty Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China
Zhengxuan Li: Key Laboratory of Specialty Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China
Junjie Peng: Key Laboratory of Specialty Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China
Acai Tan: Key Laboratory of Specialty Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China
Yingxiong Song: Key Laboratory of Specialty Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China
Yingchun Li: Key Laboratory of Specialty Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China
Jian Chen: Key Laboratory of Specialty Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China
Min Wang: Key Laboratory of Specialty Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China

DOI: https://doi.org/10.1109/JPHOT.2018.2850778
Journal volume & issue: Vol. 10, no. 4
pp. 1 – 8

Abstract

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A simplified maximum likelihood sequence estimation (MLSE) based on Viterbi algorithm has been proposed. Experimental results show that compared with the conventional MLSE, the proposed algorithm saves the multiplication by 25% with no sensitivity penalty when the memory length of MLSE is 2 both in the 25 Gb/s nonreturn to zero and 50 Gb/s four-level pulse-amplitude modulation (PAM-4) transmission systems. In order to further reduce the number of multiplications in the 50 Gb/s PAM-4 transmission system, we use 75 taps of feed-forward equalization to equalize the received PAM-4 signal into duo-binary PAM-4 (DB-PAM-4) signal and then use MLSE with the memory length of 1 to decode, which improves the sensitivity performance by 1.8 dB and reduces the computing complexity by ~98% compared with conventional MLSE (L = 4) method. As a result, a 10-km C-band transmission of 50 Gb/s PAM-4 signal is achieved using optical transceivers with a combined 3-dB bandwidth of ~8 GHz, and only 107 multiplications are required by using our proposed simplified algorithm for equalization.

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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