Open AccessExperimental demonstration and optimisation of a synchronous clock recovery technique for real-time end-to-end optical OFDM transmission at 1125Gb/s over 25km SSMF
Author(s) -
R. P. Giddings,
J. M. Tang
Publication year - 2011
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.19.002831
Subject(s) - computer science , orthogonal frequency division multiplexing , transmission (telecommunications) , electronic engineering , modulation (music) , optics , quadrature amplitude modulation , clock recovery , optical communication , bit error rate , clock signal , telecommunications , physics , decoding methods , jitter , engineering , channel (broadcasting) , acoustics
A simple, digital signal processing-free, low-cost and robust synchronous clocking technique is proposed and experimentally demonstrated, for the first time, in a 64-QAM-encoded, 11.25Gb/s over 25km SSMF, real-time end-to-end optical OFDM (OOFDM) system using directly modulated DFB laser-based intensity-modulation and direct-detection (IMDD). Detailed experimental investigations show that, in comparison with the common clock approach utilised in previous experimental demonstrations, the proposed clocking technique can be implemented to achieve no system BER performance degradation or optical power budget penalty and more importantly to improve system stability. As a viable synchronous clocking solution for real-time OOFDM transmission, this work is a vital step towards the realisation of practical OOFDM transmission systems and has particular significance for synchronisation of OOFDM multiple access-based passive optical networks where highly accurate synchronisation of all network elements is essential.