TY - JOUR
T1 - Joint OSNR and Frequency Offset Estimation Using Signal Spectrum Correlations
AU - Zhou, Jing (MSc student)
AU - Lu, Jianing
AU - Zhou, Gai
AU - Lu, Chao
N1 - Funding Information:
Manuscript received September 13, 2020; revised December 31, 2020 and February 25, 2021; accepted February 27, 2021. Date of publication March 3, 2021; date of current version May 2, 2021. This work was supported in part by the National Key R&D Program of China under Grant 2018YFB1801701; in part by the National Natural Science Foundation of China (NSFC) under Grant U1701661 and Grant 61435006; and in part by Hong Kong PhD Fellowship Scheme (HKPFS). (Corresponding author: Jianing Lu.) Jing Zhou and Jianing Lu are with Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong (e-mail: jing-dv.zhou@connect.polyu.hk; jianing.lu@connect.polyu.hk).
Publisher Copyright:
© 1983-2012 IEEE.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - 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.
AB - 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.
KW - Coherent communications
KW - Optical fiber communication
KW - Optical performance monitoring
UR - http://www.scopus.com/inward/record.url?scp=85102300849&partnerID=8YFLogxK
U2 - 10.1109/JLT.2021.3063251
DO - 10.1109/JLT.2021.3063251
M3 - Journal article
AN - SCOPUS:85102300849
SN - 0733-8724
VL - 39
SP - 2854
EP - 2863
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 9
M1 - 9368984
ER -