Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 26, Issue 5, Pages 504-507Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2014.2301176
Keywords
Coherent; phase noise; orthogonal frequency division multiplexing; phase estimation
Funding
- U.K. EPRSC Programme under Grant UNLOC [EP/J017582/1]
- FP7 FOX-C
- FP7 Project DISCUS
- Engineering and Physical Sciences Research Council [EP/J017582/1, EP/L000091/1] Funding Source: researchfish
- EPSRC [EP/L000091/1, EP/J017582/1] Funding Source: UKRI
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In this letter, a novel phase noise estimation scheme has been proposed for coherent optical orthogonal frequency division multiplexing systems, the quasi-pilot-aided method. In this method, the phases of transmitted pilot subcarriers are deliberately correlated to the phases of data subcarriers. Accounting for this correlation in the receiver allows the required number of pilots needed for a sufficient estimation and compensation of phase noise to be reduced by a factor of 2 in comparison with the traditional pilot-aided phase noise estimation method. We carried out numerical simulation of a 40 Gb/s single polarization transmission system, and the outcome of the investigation indicates that by applying quasi-pilot-aided phase estimation, only four pilot subcarriers are needed for effective phase noise compensation.
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