Electrooptic phase modulation of stretched 250-fs pulses for suppression of third-order fiber dispersion in transmission

Optical pulse distortion due to third-order dispersion (TOD) in linear fiber transmission of 250-fs pulses at 5 GHz over 600 m is reduced by applying electrooptic phase modulation (EOPM) from a LiNbO/sub 3/ device. Initial propagation in dispersion-compensating fiber cancels the second-order dispersion of the fiber-link and also linearly chirps the pulses to a stretched width of 47 ps, which enables TOD compensation by the following 5-GHz EOPM. Good agreement between experimental and analytical results is shown. Comparable transmission improvement for the 250-fs pulses is achieved up to a maximum repetition rate of 6 GHz, limited by the RF amplifier bandwidth.