Nonlinearity Tolerant LUT-Based Probabilistic Shaping for Extended-Reach Single-Span Links
| Autor: | Kieran Parsons, Pavel Skvortcov, Keisuke Kojima, Wladek Forysiak, David S. Millar, Ian Phillips, Toshiaki Koike-Akino |
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| Rok vydání: | 2020 |
| Předmět: |
Nonlinear system
Fiber (mathematics) Computer science Lookup table Electronic engineering Probabilistic logic Code rate Electrical and Electronic Engineering Span (engineering) Atomic and Molecular Physics and Optics Quadrature amplitude modulation Electronic Optical and Magnetic Materials Integer (computer science) |
| Zdroj: | IEEE Photonics Technology Letters. 32:967-970 |
| ISSN: | 1941-0174 1041-1135 |
| DOI: | 10.1109/lpt.2020.3006737 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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