Real-Time Digital Signal Processing for High-Speed Coherent Optical OFDM Synchronization

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In high-speed coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems, wide range estimation of carrier frequency offset (CFO) and hardware-efficient symbol timing synchronization are essential. The CFO estimation using the Chinese remainder theorem (CRT) was recently proposed to provide wide range estimation. In this paper, the feasibility of the proposed CRT-based CFO estimation method is demonstrated in a real-time CO-OFDM system. We also propose two-step symbol timing synchronization with simplified timing metric for CO-OFDM systems. The real-time experimental results show that the CRT-based CFO algorithm can estimate over a wide range corresponding to the sampling frequency and hardware efficient accurate symbol timing synchronization is achieved by the proposed synchronization method.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2015-06
Language
English
Article Type
Article
Keywords

FREQUENCY OFFSET ESTIMATION; TIMING SYNCHRONIZATION; SYSTEMS; PERFORMANCE

Citation

JOURNAL OF LIGHTWAVE TECHNOLOGY, v.33, no.11, pp.2294 - 2302

ISSN
0733-8724
DOI
10.1109/JLT.2015.2393304
URI
http://hdl.handle.net/10203/200067
Appears in Collection
EE-Journal Papers(저널논문)
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