Nonlinearity Tolerant LUT-based Probabilistic Shaping for Extended-Reach Single-Span Links

Pavel Skvortcov; Ian Phillips; Wladek Forysiak; Toshiaki Koike-akino; Keisuke Kojima; Kieran Parsons; David S. Millar

doi:10.1109/LPT.2020.3006737

Nonlinearity Tolerant LUT-based Probabilistic Shaping for Extended-Reach Single-Span Links

Pavel Skvortcov, Ian Phillips, Wladek Forysiak, Toshiaki Koike-akino, Keisuke Kojima, Kieran Parsons, David S. Millar

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

Abstract

We propose Huffman-coded sphere shaping (HCSS) as a method for probabilistic constellation shaping which provides improved tolerance to fiber nonlinearities in single-span links. An implementation of this algorithm based on look-up-tables (LUTs) allows for low-complexity, multiplier-free shaping. The advantage of short-length shaping for mitigating fiber nonlinear impairments is experimentally demonstrated for a system employing dual–polarization 64–ary quadrature amplitude modulation (DP-64QAM) at 56 GBd and operating over 210 km of standard single-mode fiber (SSMF). A gain in achievable information rate (AIR) of 0.4 bits/4D-symbol compared with uniform signaling is measured, corresponding to a 100% improvement in shaping gain compared with ideal Maxwell–Boltzmann (MB) shaping. The combinatorial mapping and demapping algorithms can be implemented with integer addition and comparison operations only, utilizing an LUT with 100 kbit size.

Original language	English
Article number	9131860
Pages (from-to)	967-970
Number of pages	4
Journal	IEEE Photonics Technology Letters
Volume	32
Issue number	16
Early online date	2 Jul 2020
DOIs	https://doi.org/10.1109/LPT.2020.3006737
Publication status	Published - 15 Aug 2020

Bibliographical note

© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keywords

Probabilistic shaping
experimental validation
multiplier-free LUT
nonlinear fiber channel
sphere shaping

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10.1109/LPT.2020.3006737

Nonlinearity Tolerant LUT-based Probabilistic Shaping for Extended-Reach Single-Span Links
© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Cite this

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abstract = "We propose Huffman-coded sphere shaping (HCSS) as a method for probabilistic constellation shaping which provides improved tolerance to fiber nonlinearities in single-span links. An implementation of this algorithm based on look-up-tables (LUTs) allows for low-complexity, multiplier-free shaping. The advantage of short-length shaping for mitigating fiber nonlinear impairments is experimentally demonstrated for a system employing dual–polarization 64–ary quadrature amplitude modulation (DP-64QAM) at 56 GBd and operating over 210 km of standard single-mode fiber (SSMF). A gain in achievable information rate (AIR) of 0.4 bits/4D-symbol compared with uniform signaling is measured, corresponding to a 100% improvement in shaping gain compared with ideal Maxwell–Boltzmann (MB) shaping. The combinatorial mapping and demapping algorithms can be implemented with integer addition and comparison operations only, utilizing an LUT with 100 kbit size.",

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Nonlinearity Tolerant LUT-based Probabilistic Shaping for Extended-Reach Single-Span Links

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