Influence of Equalization Enhanced Phase Noise on Digital Nonlinearity Compensation in Nyquist-spaced Superchannel Transmission Systems

被引：1
|
作者：
Ding, Jiazheng [1 ]
Xu, Tianhua [1 ,2 ,3 ]
Zhang, Yunfan [1 ]
Liu, Zheng [1 ]
Jin, Cenqin [2 ]
Zhao, Jian [1 ]
Liu, Tiegen [1 ]
机构：
[1] Tianjin Univ, Sch Precis Instruments & Optoelect Engn, Tianjin 300072, Peoples R China
[2] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England
[3] UCL, Dept Elect & Elect Engn, London WC1E 7JE, England
来源：
SEMICONDUCTOR LASERS AND APPLICATIONS XI | 2021年 / 11891卷
关键词：
Laser phase noise; electronic dispersion compensation; fiber nonlinearities; multi-channel digital back-propagation; equalization enhanced phase noise; COHERENT-DETECTION; INFORMATION RATES;
D O I：
10.1117/12.2600923
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In digital signal processing (DSP) based coherent optical communication systems, the effect of equalization enhanced phase noise (EEPN) will seriously degrade the transmission performance of high-capacity optical transmission system. In this paper, we have investigated the influence of EEPN on 9-channel 32-Gbaud dual-polarization 64-ary quadrature amplitude modulation (DP-64QAM) Nyquist-spaced superchannel optical field trial by using electronic dispersion compensation (EDC) and multi-channel digital backpropagation (MC-DBP). The deteriorations caused by EEPN on the signal-to-noise-ratio (SNR) and achievable information rates (AIRs) in high-speed optical communication systems have been studied. The system performance versus back-propagated bandwidth under different laser linewidth have also been demonstrated. The SNR penalty due to the distortion of EEPN achieves similar to 5.11 dB when FF-DBP is implemented, which informs that FF-DBP is more susceptible to EEPN, especially when the LO laser linewidth is larger. The system AIR versus different transmission distance under different EEPN interference using EDC-only and MC-DBP have also been evaluated, which show that there is a trade-off on the selection of lasers and back-propagated bandwidths to achieve a target AIR.
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页数：8
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