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Title: Accurate two-stage frequency offset estimation for coherent optical systems
Authors: Huang, D.
Cheng, T.-H.
Yu, C. 
Keywords: Coherent optical communication
digital signal processing
frequency offset estimation
Issue Date: 2013
Citation: Huang, D., Cheng, T.-H., Yu, C. (2013). Accurate two-stage frequency offset estimation for coherent optical systems. IEEE Photonics Technology Letters 25 (2) : 179-182. ScholarBank@NUS Repository.
Abstract: We present a two-stage feedforward frequency offset estimation (FOE) algorithm on the basis of the phase-difference method. The first stage of the proposed FOE generates a rough FOE through averaging the phase difference between two adjacent symbols and compensates the signals. The second stage of the FOE estimates the residual FO through averaging the phase difference of two symbols with distance L , which provides a significantly larger noise-tolerance and thus improves system performance. The proposed FOE can be applied to both quadrature phase-shift keying and 16-quadrature amplitude modulation systems. Simulations show that the mean square error of the proposed FOE can be reduced through an order of two in magnitude under small laser linewidth situation compared with the classic phase-difference-based FOE. The experimental result shows that the proposed FOE gives 0.6-dB optical-signal-to-noise-ratio improvement against the classic FOE, which validates its usefulness. © 1989-2012 IEEE.
Source Title: IEEE Photonics Technology Letters
ISSN: 10411135
DOI: 10.1109/LPT.2012.2232288
Appears in Collections:Staff Publications

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