Demonstrating doubly-differential quadrature phase shift keying in the optical domain

Anthony J. Walsh, Haymen Shams, James Mountjoy, Anthony Fagan, Jian Zhao, Liam P. Barry, Andrew D. Ellis

Research output: Contribution to journalArticlepeer-review


We report for the first time the experimental demonstration of doubly differential quadrature phase shift keying (DDQPSK) using optical coherent detection. This method is more robust against high frequency offsets (FO) than conventional single differential quadrature phase shift keying (SDQPSK) with offset compensation. DDQPSK is shown to be able to compensate large FOs (up to the baud rate) and has lower computational requirements than other FO compensation methods. DDQPSK is a simple algorithm to implement in a real-time decoder for optical burst switched network scenarios. Simulation results are also provided, which show good agreement with the experimental results for both SDQPSK and DDQPSK transmissions.
Original languageEnglish
Pages (from-to)1054-1057
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number11
Early online date12 Apr 2013
Publication statusPublished - 1 Jun 2013

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  • phase modulation
  • burst switching
  • optical fiber communication


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