Reduction of Optical Beat Noise in Optical Sampled Subcarrier Multiplexing Systems Using Polarization Interleaved-OTDM technology

An enhanced optical sampled subcarrier multiplexing scheme using polarization interleaving in optical subcarrier multiplexing networks is proposed and experimentally demonstrated for distortion reduction and optical beat interference (OBI) suppression. By using the proposed polarization interleaving scheme, a system can employ a lower-cost broad pulse source (50 ps) and achieve comparable performance, in terms of carrier-to-noise ratio (CNR) and composite triple beat (CTB), to the prior scheme using narrow pulse source (3 ps). The proposed scheme significantly enhances the chromatic dispersion tolerance, thus alleviating the OBI caused by the pulse overlapping.