Pilot-Aided Channel Equalization in RGI-PDM-CO-OFDM Systems

摘要: A pilot-aided channel equalizer (PACE) is proposed to mitigate the impairments caused by polarization mode dispersion and laser phase noise simultaneously in reduced-guard-interval polarization-division-multiplexing coherent-optical orthogonal-frequency-division-multiplexing (RGI-PDM-CO-OFDM) transmission systems. Since PACE updates state information symbol-by-symbol, it enables us track drifts optical channel. Adaptive (APACE) boosted (BPACE) are then further improve performance of PACE. Numerical simulations carried out compare APACE BPACE with a conventional training symbols aided (TSACE) adaptive decision-direct for 108-Gb/s (56-GS/s) RGI-PDM-CO-OFDM system. It revealed that both offer superior performances over other two equalizers presence noise, they can tolerate lasers line width around β = 2000 k ( 2πβTs 2.24 × 10 when normalized symbol rate 1/Ts). We also show only small additional computation efforts required compared TSACE.