期刊
OPTICS EXPRESS
卷 29, 期 25, 页码 41622-41633出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.444231
关键词
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类别
资金
- National Key Research and Development Program of China [2018YFB1801701]
- National Natural Science Foundation of China [61875233, 62101602, 62105273, U1701661]
- Key R&D Program of Guangdong Province [2018B030329001]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X121]
- Open Projects Foundationof State Key Laboratory of Optical Fiber and Cable Manufacture Technology (YOFC) [SKLD1806]
- Science and Technology Planning Project of Guangdong Province [2019A050510039]
The improved IWDFE is demonstrated to mitigate chromatic dispersion-induced power fading in C-band PAM-4 system, outperforming conventional DFE and rule-based WDFEs in reducing error probability and percentage. The N-FFE-IWDFE significantly reduces BER and improves receiver sensitivity, achieving successful 120-Gb/s transmission over 50-km SSMF with BER below HD-FEC limit. This is the first application of IWDFE in C-band IM/DD optical transmission system.
An improved weighted decision-feedback equalizer (IWDFE) is adopted and experimentally demonstrated to mitigate chromatic dispersion (CD) induced power fading for C-band four-level pulse amplitude modulation (PAM-4) system. Based on a compressed sigmoid nonlinear function, the IWDFE is superior to the conventional DFE, rule-1 and rule-2 based WDFEs in reducing both the error propagation probability and percentage of errors. The IWDFE is combined with a feed-forward equalizer (FFE) to deal with both pre-cursor and post-cursor interference simultaneously. We also introduce 2nd-order polynomial nonlinear terms in both FFE and IWDFE at receiver side, constructing a nonlinear FFE-IWDFE (N-FFE-IWDFE) to simultaneously equalize both the CD-induced power fading and nonlinear distortions. Experimental results show that compared with nonlinear FFE-DFE (N-FFE-DFE), rule-1 and rule-2 based nonlinear FFE-WDFEs (N-FFE-WDFEs), the N-FFE-IWDFE can significantly reduce the bit error ratio (BER), which is close to that of the error-propagation-free N-FFE-DFE. By utilizing the N-FFE-IWDFE, 120-Gb/s PAM-4 transmission system over 50-km standard single-mode fiber (SSMF) is realized with the BER below 7% hard-decision forward error correction (HD-FEC) limit of 3.8 x 10(-3), achieving around 1.1-dB improvement of the receiver sensitivity over the N-FFE-DFE. To the best of our knowledge, this is the first time that an IWDFE is employed for C-band IM/DD optical transmission system. (C) 2021 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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