Open AccessExperimental demonstration of 30 Gb/s direct-detection optical OFDM transmission with blind symbol synchronisation using virtual subcarriers
Author(s) -
Rachid Bouziane,
Peter Milder,
Sezer Erkilinç,
L Galdino,
Sean Kilmurray,
Benn C. Thomsen,
Polina Bayvel,
Robert I. Killey
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.004342
Subject(s) - orthogonal frequency division multiplexing , computer science , transmission (telecommunications) , bit error rate , transmitter , quadrature amplitude modulation , electronic engineering , bandwidth (computing) , real time computing , telecommunications , channel (broadcasting) , engineering
The paper investigates the performance of a blind symbol synchronisation technique for optical OFDM systems based on virtual subcarriers. The test-bed includes a real-time 16-QAM OFDM transmitter operating at a net data rate of 30.65 Gb/s using a single OFDM band with a single FPGA-DAC subsystem and demonstrates transmission over 23.3 km SSMF with direct detection at a BER of 10(-3). By comparing the performance of the proposed synchronisation scheme with that of the Schmidl and Cox algorithm, it was found that the two approaches achieve similar performance for large numbers of averaging symbols, but the performance of the proposed scheme degrades as the number of averaging symbols is reduced. The proposed technique has lower complexity and bandwidth overhead as it does not rely on training sequences. Consequently, it is suitable for implementation in high speed optical OFDM transceivers.