Time and frequency synchronisation in all-optical orthogonal frequency division multiplexing systems

Mumtaz Ali; Bo Dai; Xu Wang

Time and frequency synchronisation in all-optical orthogonal frequency division multiplexing systems

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Author(s): Mumtaz Ali ¹ ; Bo Dai ^{1, 2} ; Xu Wang ¹
- Affiliations: 1: School of Engineering and Physical Sciences, Institute of Photonics and Quantum Sciences (IPaQS), Heriot-Watt University, Edinburgh, EH14 4AS, UK;
  2: Engineering Research Center of Optical Instrument and System, Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, People's Republic of China
Source: Volume 9, Issue 5, 26 March 2015, p. 630 – 637
DOI: 10.1049/iet-com.2014.0652 , Print ISSN 1751-8628, Online ISSN 1751-8636

Received 04/07/2014, Accepted 30/10/2014, Revised 09/10/2014, Published 02/02/2015

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_RX). 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_RX = 30 GHz, the maximum acceptable relative deviations for the STM and the ScFO are 11 and 14%, respectively.

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Time and frequency synchronisation in all-optical orthogonal frequency division multiplexing systems

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