A Novel Probabilistic Shaping PAM4 Employing Bit Weight Reconstruction for Optical Interconnection

Haiyun Yu; Hailian He; Jiafei Fan; Wenhao Lei; Junyuan Song; Zhipei Li; Ze Dong

doi:10.1109/LPT.2023.3301970

A Novel Probabilistic Shaping PAM4 Employing Bit Weight Reconstruction for Optical Interconnection

Haiyun Yu, Hailian He, Jiafei Fan, Wenhao Lei, Junyuan Song, Zhipei Li^*, Ze Dong^*

^*Corresponding author for this work

School of Information and Electronics

Research output: Contribution to journal › Article › peer-review

Abstract

In this letter, a novel probabilistic shaping (PS) scheme based on joint polar-coded modulation is proposed and experimentally demonstrated in an intensity modulation and direct-detection four-level pulse amplitude modulation (PAM4) optical interconnection. Different from the prevailing probability-oriented PS schemes like constant composition distribution matching (CCDM) and the symbol-oriented ones like many-to-one (MTO) mapping, the proposed bit-oriented one realizes PS through simple bit weight reconstruction (BWR) in joint systematic-like polar coded modulation with lower computational complexity. As a key process in BWR, two bit-permutation (BP) operations are employed to reuse the frozen bits for dynamic frozen bits shaping, to obtain the desired PS distribution by enhancing the probability weight of bit '0' with neither additional shaping bits nor extra FEC redundancy. The experimental results show that 1.7-dB receiver power sensitivity enhancement and 2.6-dB systematic tolerance improvement to optical fiber nonlinear effect can be achieved in a 5-km optical PAM4 interconnection system.

Original language	English
Pages (from-to)	1123-1126
Number of pages	4
Journal	IEEE Photonics Technology Letters
Volume	35
Issue number	20
DOIs	https://doi.org/10.1109/LPT.2023.3301970
Publication status	Published - 15 Oct 2023

Keywords

BWR
PAM4
Probabilistic shaping
optical interconnection
polar code

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10.1109/LPT.2023.3301970

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title = "A Novel Probabilistic Shaping PAM4 Employing Bit Weight Reconstruction for Optical Interconnection",

abstract = "In this letter, a novel probabilistic shaping (PS) scheme based on joint polar-coded modulation is proposed and experimentally demonstrated in an intensity modulation and direct-detection four-level pulse amplitude modulation (PAM4) optical interconnection. Different from the prevailing probability-oriented PS schemes like constant composition distribution matching (CCDM) and the symbol-oriented ones like many-to-one (MTO) mapping, the proposed bit-oriented one realizes PS through simple bit weight reconstruction (BWR) in joint systematic-like polar coded modulation with lower computational complexity. As a key process in BWR, two bit-permutation (BP) operations are employed to reuse the frozen bits for dynamic frozen bits shaping, to obtain the desired PS distribution by enhancing the probability weight of bit '0' with neither additional shaping bits nor extra FEC redundancy. The experimental results show that 1.7-dB receiver power sensitivity enhancement and 2.6-dB systematic tolerance improvement to optical fiber nonlinear effect can be achieved in a 5-km optical PAM4 interconnection system.",

keywords = "BWR, PAM4, Probabilistic shaping, optical interconnection, polar code",

author = "Haiyun Yu and Hailian He and Jiafei Fan and Wenhao Lei and Junyuan Song and Zhipei Li and Ze Dong",

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doi = "10.1109/LPT.2023.3301970",

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AU - He, Hailian

AU - Fan, Jiafei

AU - Lei, Wenhao

AU - Song, Junyuan

AU - Li, Zhipei

AU - Dong, Ze

PY - 2023/10/15

Y1 - 2023/10/15

N2 - In this letter, a novel probabilistic shaping (PS) scheme based on joint polar-coded modulation is proposed and experimentally demonstrated in an intensity modulation and direct-detection four-level pulse amplitude modulation (PAM4) optical interconnection. Different from the prevailing probability-oriented PS schemes like constant composition distribution matching (CCDM) and the symbol-oriented ones like many-to-one (MTO) mapping, the proposed bit-oriented one realizes PS through simple bit weight reconstruction (BWR) in joint systematic-like polar coded modulation with lower computational complexity. As a key process in BWR, two bit-permutation (BP) operations are employed to reuse the frozen bits for dynamic frozen bits shaping, to obtain the desired PS distribution by enhancing the probability weight of bit '0' with neither additional shaping bits nor extra FEC redundancy. The experimental results show that 1.7-dB receiver power sensitivity enhancement and 2.6-dB systematic tolerance improvement to optical fiber nonlinear effect can be achieved in a 5-km optical PAM4 interconnection system.

AB - In this letter, a novel probabilistic shaping (PS) scheme based on joint polar-coded modulation is proposed and experimentally demonstrated in an intensity modulation and direct-detection four-level pulse amplitude modulation (PAM4) optical interconnection. Different from the prevailing probability-oriented PS schemes like constant composition distribution matching (CCDM) and the symbol-oriented ones like many-to-one (MTO) mapping, the proposed bit-oriented one realizes PS through simple bit weight reconstruction (BWR) in joint systematic-like polar coded modulation with lower computational complexity. As a key process in BWR, two bit-permutation (BP) operations are employed to reuse the frozen bits for dynamic frozen bits shaping, to obtain the desired PS distribution by enhancing the probability weight of bit '0' with neither additional shaping bits nor extra FEC redundancy. The experimental results show that 1.7-dB receiver power sensitivity enhancement and 2.6-dB systematic tolerance improvement to optical fiber nonlinear effect can be achieved in a 5-km optical PAM4 interconnection system.

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A Novel Probabilistic Shaping PAM4 Employing Bit Weight Reconstruction for Optical Interconnection

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