Signal power distribution based modulation format identification for coherent optical receivers

Jie Liu, Kangping Zhong, Zhenhua Dong, Changjian Guo, Pak Tao Lau, Chao Lu, Yanzhao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


A simple modulation format identification (MFI) technique based on extracting features from the statistical distributions of normalized signal power is proposed for cognitive coherent optical receivers. The proposed MFI technique requires no prior training and is independent of phase noise or frequency offset. Furthermore, it also performs good identification of the polarization-multiplexed (PM) M-QAM signals even after insufficient equalization of the constant modulus algorithm (CMA). Simulation results demonstrate successful MFI among PM-QPSK, PM-8-QAM, PM-16-QAM, PM-32-QAM and PM-64-QAM signals within OSNR range of practical system. Experimental verification using PM-QPSK/16-QAM/64-QAM signals also confirms the feasibility of the proposed MFI technique after long distance fiber transmission.
Original languageEnglish
Pages (from-to)75-81
Number of pages7
JournalOptical Fiber Technology
Publication statusPublished - 1 Jul 2017


  • Coherent optical receiver
  • Digital signal processing
  • Modulation format identification

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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