Simplified Soft-Output Direct Detection FTN Algorithm for 56-Gb/S Optical PAM-4 System Using 10G-Class Optics

Shuangyue Liu; Yaojun Qiao; Xizi Tang; Mengqi Guo; Xuekai Xu; Zhongliang Sun; Han Cui; Yueming Lu

doi:10.1109/ACCESS.2020.2999346

IEEE Access (Jan 2020)

Simplified Soft-Output Direct Detection FTN Algorithm for 56-Gb/S Optical PAM-4 System Using 10G-Class Optics

Shuangyue Liu,
Yaojun Qiao,
Xizi Tang,
Mengqi Guo,
Xuekai Xu,
Zhongliang Sun,
Han Cui,
Yueming Lu

Affiliations

Shuangyue Liu: 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
Xizi 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
Mengqi Guo: ORCiD; State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Xuekai Xu: 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
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
Yueming Lu: ORCiD; Key Laboratory of Trustworthy Distributed Computing and Service, Ministry of Education, School of Cyberspace Security, Beijing University of Posts and Telecommunications, Beijing, China

DOI: https://doi.org/10.1109/ACCESS.2020.2999346
Journal volume & issue: Vol. 8
pp. 104518 – 104526

Abstract

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In this paper, a simplified soft-output direct detection faster than Nyquist (SO-DD-FTN) algorithm is proposed to eliminate severe inter-symbol interference in optical interconnects. The feasibility of the proposed algorithm is verified in a C-band 56-Gb/s 4-ary pulse amplitude modulation (PAM-4) system using 10G-class optics, and the 3-dB system bandwidth is only 5.5 GHz. Compared to conventional SO-DD-FTN, the simplified SO-DD-FTN not only reduces 90% multiplication complexity and 80% addition complexity, but also has almost no performance degradation. Experimental results show that, for the back-to-back case, the achieved receiver sensitivity using simplified SO-DD-FTN has 4.5-dB improvement compared with conventional direct detection faster than Nyquist (DD-FTN). As for 20-km standard single-mode fiber (SSMF) transmission application, since the system suffers from both optical/electronic bandwidth limitation and dispersion-induced power fading, the conventional DD-FTN cannot achieve the bit error rate (BER) threshold of 10-3, while the simplified SO-DD-FTN can achieve the BER threshold at received optical power of -14.5 dBm. In conclusion, the proposed simplified SO-DD-FTN algorithm achieves superior performance with low computational complexity and has the potential for applying to optical interconnects.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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