Modulation-format-independent carrier phase estimation for square M-QAM systems

Yuliang Gao, Pak Tao Lau, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)


A modulation-format-independent or universal carrier phase estimation (U-CPE) technique is proposed for square 4-, 16-, and 64-ary quadrature amplitude modulation transmission systems for future elastic optical networks. The proposed U-CPE is based on a feedback architecture and eliminates the need to know the signal modulation format (MF) by using a cost function in the phase estimation update that is common to all square-shaped constellations. Compared with standard decision directed phase lock loop (S-DD-PLL) that requires the knowledge of the MF, the U-CPE method maintains close OSNR performance and linewidth tolerance. When MF is agnostic, the proposed U-CPE outperforms a modulation format oblivious (MFO)-DD-PLL in which QPSK decision rules are always used irrespective of actual MF of the signal.
Original languageEnglish
Article number6508837
Pages (from-to)1073-1076
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number11
Publication statusPublished - 23 May 2013


  • Carrier phase recovery
  • coherent communication
  • optical communication
  • phase noise
  • quadrature amplitude modulation

ASJC Scopus subject areas

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


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