Open AccessTime and frequency synchronisation in all‐optical orthogonal frequency division multiplexing systems
Author(s) -
Ali Mumtaz,
Dai Bo,
Wang Xu
Publication year - 2015
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2014.0652
Subject(s) - orthogonal frequency division multiplexing , subcarrier , cyclic prefix , bit error rate , intersymbol interference , electronic engineering , frequency offset , computer science , carrier frequency offset , multiplexing , telecommunications , frequency division multiplexing , bandwidth (computing) , engineering , channel (broadcasting)
In all‐optical orthogonal frequency division multiplexing (AO‐OFDM) systems, symbol time misalignment (STM) and subcarrier frequency offset (ScFO) result in intercarrier‐interference and intersymbol interference, leading to degradation of bit error rate (BER) performance. In this study, an analytical study of the impacts of STM and ScFO on AO‐OFDM system performance is conducted. In the presence of STM and ScFO, AO‐OFDM system performance is evaluated with the number of subcarriers ( N SC ), cyclic prefix requirements and receiver bandwidth (BW R X ). For AO‐OFDM system without CP, results show that the STM gives higher BER than the ScFO. To keep the BER below 10 − 3 in AO‐OFDM systems with on‐off keying‐modulated three optical subcarriers and homodyne detection with BW R X = 30 GHz, the maximum acceptable relative deviations for the STM and the ScFO are 11 and 14%, respectively.