Joint OSNR and Frequency Offset Estimation Using Signal Spectrum Correlations

Jing (MSc student) Zhou, Jianing Lu, Gai Zhou, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Article number9368984
Pages (from-to)2854-2863
Number of pages10
JournalJournal of Lightwave Technology
Issue number9
Publication statusPublished - 1 May 2021


  • Coherent communications
  • Optical fiber communication
  • Optical performance monitoring

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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