Laser linewidth tolerance of decision-aided maximum likelihood phase estimation in coherent optical M-ary PSK and QAM systems

S. Zhang, P. Y. Kam, Changyuan Yu, J. Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

73 Citations (Scopus)


This letter extends the decision-aided (DA) maximum likelihood (ML) phase estimation in an Mary phase-shift keying (PSK) system to quadrature amplitude modulation (QAM) signals. The block length effect is simulated for both M-ary PSK and QAM systems, and also investigated in M-ary PSK systems through analysis. Our results show that the tolerance of DA ML to laser linewidth for square 16-QAM can be increased by >10 times compared to the block Mth power scheme.
Original languageEnglish
Pages (from-to)1075-1077
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number15
Publication statusPublished - 1 Dec 2009
Externally publishedYes


  • Coherent detection
  • Optical fiber communication

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this