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Title: Post-FEC performance evaluation of coherent QPSK system with an enhanced pilot-aided CPE scheme
Authors: Cheng, H
Chen, H
Li, Y
Lu, C 
Wu, J
Lin, J
Keywords: Pilot-aided CPE
Phase unwrapping
Differential penalty
Soft-decision FEC
Issue Date: 2016
Publisher: Springer
Source: Photonic network communications, 2016, v. 32, no. 2, p. 230-236 How to cite?
Journal: Photonic network communications 
Abstract: In this paper, a simple and robust pilot-aided carrier phase estimation scheme with a modified phase unwrapping is proposed. The principle of the proposed phase unwrapping is shown with a step-by-step procedure. Further, we test the post-FEC BER performance for the pilot-aided carrier phase estimation scheme with the traditional and proposed phase unwrapping. For the proposed phase unwrapping, a cycle slip rate reduction of about 10 times is achieved than the case using the traditional phase unwrapping through simulations in the presence of Wiener phase noise. Finally, we present a 2.2 Eb/N0 gain and post-FEC error-free performance with only 0.78 % pilot overhead in a 32-Gbaud QPSK system using soft-decision forward error correction.
ISSN: 1387-974X
DOI: 10.1007/s11107-016-0630-7
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