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Real-Time Digital Signal Processing for High-Speed Coherent Optical OFDM Synchronization
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- Authors
- Hae Young Rha, Chun Ju Youn, Yong-Hwan Kwon, Hae-Wook Choi
- Issue Date
- 2015-06
- Citation
- IEEE/OSA Journal of Lightwave Technology, v.33, no.11, pp.2294-2302
- ISSN
- 0733-8724
- Publisher
- IEEE, OSA
- Language
- English
- Type
- Journal Article
- Abstract
- 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.
- KSP Keywords
- CFO estimation, Carrier Frequency Offset, Chinese remainder theorem(CRT), Coherent optical orthogonal frequency division multiplexing(CO-OFDM), Hardware efficient, High Speed, OFDM synchronization, OFDM systems, Optical OFDM, Orthogonal Frequency-Division Multiplexing(OFDM), Range Estimation