A Fast and Efficient Frequency Offset Correction Technique for Coherent Optical Orthogonal Frequency Division Multiplexing

A wide-range frequency offset correction is an essential function in the coherent-detection optical (CO) orthogonal frequency division multiplexing (OFDM) system. However, unlike conventional radio-frequency OFDM systems, the frequency offsets of CO systems come from the laser instability and bring...

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Bibliographic Details
Published in:Journal of lightwave technology 2011-07, Vol.29 (13), p.1997-2004
Main Authors: FAN, Shu-Hao, JIANJUN YU, DAYOU QIAN, CHANG, Gee-Kung
Format: Article
Language:English
Subjects:
Adaptive optics
Applied sciences
Carbon monoxide
Carrier frequency offset
Cobalt
Coherence
coherent detection
Detection, estimation, filtering, equalization, prediction
Dynamical systems
Dynamics
Estimation
Exact sciences and technology
Frequency estimation
Information, signal and communications theory
Multiplexing
OFDM
Offsets
optical fiber communication
Optical fiber communications
Optical telecommunications
Orthogonal Frequency Division Multiplexing
Receivers
Signal and communications theory
Signal to noise ratio
Signal, noise
Symbols
Telecommunications
Telecommunications and information theory
Training
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Summary:A wide-range frequency offset correction is an essential function in the coherent-detection optical (CO) orthogonal frequency division multiplexing (OFDM) system. However, unlike conventional radio-frequency OFDM systems, the frequency offsets of CO systems come from the laser instability and bring much higher randomness and uncertainty between the local oscillation source and the incoming signal. Therefore, it is difficult to achieve low complexity and high precision for the frequency offset estimation at the same time. To fulfill the requirement of the CO-OFDM transmission system, we propose a novel algorithm using sample-shifted training symbols for the fast acquisition of the frequency offset in the CO-OFDM system. Based on the characteristics of optical coherency and the CO-OFDM symbol interval, the dynamic tracking of the frequency offset variation can also be simplified by using the OFDM pilot subcarriers.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2011.2156383