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Joint OSNR and Frequency Offset Estimation Using Signal Spectrum Correlations
Journal of Lightwave Technology ( IF 4.7 ) Pub Date : 2021-03-03 , DOI: 10.1109/jlt.2021.3063251
Jing Zhou 1 , Jianing Lu 1 , Gai Zhou 2 , Chao Lu 1
Affiliation  

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.

中文翻译:

使用信号频谱相关性的联合OSNR和频率偏移估计

我们提出了一种高效且调制格式透明的方法,通过使用相干光纤通信系统的信号频谱相关性来共同估算光信噪比(OSNR)和频率偏移(FO)。基于信号频谱相关性分析,可以在色散补偿(CDC)之后进行粗略的FO估计(FOE)和相应的补偿。这样,就可以准确地运行OSNR监视,而不会因FO而导致性能下降。同时,为了实现良好的FOE,可以使用信号的下采样处理来降低基于快速傅里叶变换的FOE(FFT-FOE)的复杂度,而不会损失FOE分辨率。仿真结果表明,当OSNR在10至30 dB范围内时,该方案的绝对OSNR估计误差小于0.18 dB。最后,
更新日期:2021-04-23
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