Experiment on coherent optical RZ 8-Star QAM systems using decision-aided maximum likelihood phase estimation

Hongyu Zhang, Banghong Zhang, Changyuan Yu, Pooi Yuen Kam

Research output: Journal article publicationJournal articleAcademic researchpeer-review


In this letter, a return-to-zero 8-star quadrature amplitude modulation (QAM) signal is generated for the first time by using a parallel I/Q modulator followed by an amplitude modulator with binary drive signals. Our experimental results verify the theoretically derived approximate bit-error rate and ring ratio optimization algorithm of the 8-star QAM. Decision-aided maximum likelihood phase estimation (PE) shows comparable performance with V&V Mth-power PE, but with much less computational complexity.
Original languageEnglish
Article number6327393
Pages (from-to)2139-2142
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number23
Publication statusPublished - 7 Dec 2012
Externally publishedYes


  • Coherent optical communications
  • modulation format
  • phase estimation
  • phase noise

ASJC Scopus subject areas

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

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