Simple sampling clock synchronisation scheme for reduced-guard-interval coherent optical OFDM systems


A easy data-aided scheme for sampling clock synchronisation in reduced-guard-interval coherent optical OFDM (RGI-CO-OFDM) systems is proposed. Within the proposed theme, the sampling clock offset (SCO) is estimated by using the coaching symbols reserved for channel estimation, so avoiding extra training overhead. The SCO is then compensated by resampling, using a time-domain interpolation filter. The feasibility of the proposed scheme is demonstrated by suggests that of numerical simulations in a very thirty two Gbaud 16-QAM dual-polarisation RGI-CO-OFDM system.

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