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.
Bibliographical noteFunding: UK EPRSC Programme - Grant UNLOC (EP/J017582/1); FP7 FOX-C; and FP7 Project DISCUS.
Le, S. T., Kanesan, T., Giacoumidis, E., Doran, N. J., & Ellis, A. D. (2014). Quasi-pilot aided phase noise estimation for coherent optical OFDM systems. IEEE Photonics Technology Letters, 26(5), 504-507. https://doi.org/10.1109/LPT.2014.2301176