Dual-stage cascaded frequency offset estimation for digital coherent receivers

S. Zhang, L. Xu, J. Yu, M. F. Huang, P. Y. Kam, C. Yu, T. Wang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Frequency offset estimation is a key function in carrier phase recovery to enable digital coherent reception. We propose a novel, feed-forward, dual-stage frequency offset estimator, and demonstrate its performance through both simulation and experiment. Our simulation results show that the estimation range can be as large as ±9 GHz for a 10.7-GBaud polarization-multiplexed (PolMux) quadrature phase-shift keying (QPSK) system. In addition, the widest range of ±0.5 times the system symbol rate is achieved for the first time in an experimental 42.8-Gb/s coherent PolMux QPSK receiver.

Original languageEnglish (US)
Article number5401069
Pages (from-to)401-403
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number6
StatePublished - Mar 15 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


  • Coherent optical communication
  • Frequency offset
  • Timing recovery


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