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

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


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