Probabilistic shaping PAM8 based on Huffman coding distribution matching in optical interconnection

We propose and experimentally verify a Huffman coding distribution matching (HCDM) scheme in intensity modulation and direct-detection (IM/DD) optical interconnection applying low-density parity-check-coded (LDPC) probabilistic shaping 8-level pulse amplitude modulation (PS-PAM8). Not only superior...

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Bibliographic Details
Published inJournal of modern optics Vol. 69; no. 12; pp. 693 - 698
Main Authors Lu, Dingyi, Zhao, Youdi, He, Hailian, Rao, Yuan, Shi, Hao, Huang, Shaotong, Yu, Haiyun, Dong, Ze
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 12.07.2022
Taylor & Francis Ltd
Subjects
Binomial coefficients
Coding
Error correcting codes
Huffman codes
Huffman coding distribution matching
Lookup tables
Matching
Optical fibers
optical interconnection
Optical interconnects
PAM8
probabilistic shaping
Pulse amplitude modulation
Statistical analysis
symbol probability distribution
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Summary:We propose and experimentally verify a Huffman coding distribution matching (HCDM) scheme in intensity modulation and direct-detection (IM/DD) optical interconnection applying low-density parity-check-coded (LDPC) probabilistic shaping 8-level pulse amplitude modulation (PS-PAM8). Not only superior to that of conventional PS methods in view of arithmetic distribution matching (ADM) as well as constant composition distribution matching (CCDM) with much lower computational complexity, the HCDM can also enable arbitrary symbol probability distribution (SPD) by utilizing an optimal Huffman binary tree. The binomial coefficients required for SPD can be precomputed and stored in a lookup table. The experimental results show that the HCMD PS-PAM8 shows remarkably promoted receiver power sensitivity and improved system tolerance to optical fibre nonlinear effects compared to the uniformly distributed signal with the same effective net rate.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2022.2075481