Joint OSNR and Frequency Offset Estimation Using Signal Spectrum Correlations

被引：5
作者：
Zhou, Jing [1 ]
Lu, Jianing [1 ]
Zhou, Gai [2 ,3 ]
Lu, Chao [1 ]
机构：
[1] Hong Kong Polytech Univ, Photon Res Ctr, Dept Elect & Informat Engn, Hong Kong, Peoples R China
[2] Hong Kong Polytech Univ, Dept Elect Engn, Hong Kong, Peoples R China
[3] Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
来源：
JOURNAL OF LIGHTWAVE TECHNOLOGY | 2021年 / 39卷 / 09期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Optical noise; Signal to noise ratio; Correlation; Monitoring; Adaptive optics; Optical fibers; Optical modulation; Coherent communications; optical fiber communication; optical performance monitoring; COHERENT; PERFORMANCE;
D O I：
10.1109/JLT.2021.3063251
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：
We propose an efficient and modulation-format-transparent method to jointly estimate optical signal-to-noise ratio (OSNR) and frequency offset (FO) by using signal spectrum correlations for coherent optical fiber communication systems. Based on the signal spectrum correlation analysis, a coarse FO estimation (FOE) and the corresponding compensation can be conducted after chromatic dispersion compensation (CDC). Then, OSNR monitoring can be accurately operated without deterioration caused by FO. Meanwhile, to realize fine FOE, down-sampling process of signal can be used to reduce the complexity of fast Fourier transform-based FOE (FFT-FOE) without losing FOE resolution. Simulation results show that when the OSNR is in the range of 10 to 30 dB, the proposed scheme presents an absolute OSNR estimation error lower than 0.18 dB. Finally, we experimentally demonstrate our scheme in an optical back-to-back (B2B) transmission link using 28 Gbaud dual-polarization (DP)-4/16/32-quadrature amplitude modulation (QAM) formats, and an absolute OSNR estimation error lower than 0.66 dB is achieved for OSNR ranging from 15 to 30 dB.
引用
收藏
页码：2854 / 2863
页数：10
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