Symbol synchronization exploiting the symmetric property in optical fast OFDM

Jian A. Zhao, Selwan K. Ibrahim, Danish Rafique, Paul Gunning, Andrew D. Ellis

Research output: Contribution to journalArticlepeer-review


We propose a new simple method to achieve precise symbol synchronization using one start-of-frame (SOF) symbol in optical fast orthogonal frequency-division multiplexing (FOFDM) with subchannel spacing equal to half of the symbol rate per sub-carrier. The proposed method first identifies the SOF symbol, then exploits the evenly symmetric property of the discrete cosine transform in FOFDM, which is also valid in the presence of chromatic dispersion, to achieve precise symbol synchronization. We demonstrate its use in a 16.88-Gb/s phase-shifted-keying-based FOFDM system over a 124-km field-installed single-mode fiber link and show that this technique operates well in automatic precise symbol synchronization at an optical signal-to-noise ratio as low as 3 dB and after transmission.
Original languageEnglish
Article number5719155
Pages (from-to)594-596
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number9
Publication statusPublished - 1 May 2011

Bibliographical note

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  • detection
  • modulation
  • orthogonal frequency- division multiplexing
  • wavelength-division multiplexing


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