COMPENSATION FOR WAVE-FORM DISTORTION IN A TRANSMISSION FIBER WITH LOSS BY OPTICAL-PHASE CONJUGATION

A new method is proposed to compensate for chromatic dispersion and se lf-phase modulation in a transmission fiber with a loss using optical phase conjugate (OPC). The ratio of the optical Kerr effect and the di spersion was designed to be equal at each position before and after th e OPC. The pulse shape is precompensated before OPC by transmission th rough a fiber with large dispersion whereas the transmission line cons ists of an optical amplifier repeated fiber link with a small dispersi on. A computer simulation demonstrates effective compensation for wave form distortion in a 40-Gb/s no-return-to-zero (NRZ) intensity-modulat ed light transmission. The method will be effectively applied to both wavelength demultiplexing method (WDM) systems and long-haul transmiss ion systems.