Symbol Synchronization Exploiting the Symmetric Property in Optical Fast OFDM

Author

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

Author_Institution

Photonic Syst. Group, Univ. Coll. Cork, Cork, Ireland

Volume

23

Issue

9

fYear

2011

fDate

5/1/2011 12:00:00 AM

Firstpage

594

Lastpage

596

Abstract

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 subcarrier. 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.

Keywords

OFDM modulation; channel spacing; discrete cosine transforms; optical dispersion; optical fibre communication; phase shift keying; synchronisation; automatic precise symbol synchronization; bit rate 16.88 Gbit/s; chromatic dispersion; discrete transform; distance 124 km; field-installed single-mode fiber link; optical fast OFDM; optical fast orthogonal frequency-division multiplexing; optical signal-to-noise ratio; phase-shifted-keying; subchannel spacing; symbol rate; symmetric property; OFDM; Optical fibers; Optical noise; Signal to noise ratio; Synchronization; Detection; modulation; orthogonal frequency- division multiplexing (OFDM); wavelength-division multiplexing;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2011.2118195

Filename

5719155