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Chromatic Dispersion is one of the major (Linear) effect in Optic transmission System. Dispersion causes broadening of transmitted pulses that leads to Inter Symbol Interference (ISI). Dispersion effect can be compensated by using Phase Conjugation technique. Phase conjugators were used in mid-way of the system in the late 90's to demonstrate for the compensation of dispersion. In this paper analysis of phase conjugation in compensating dispersion in an optical transmission system with bitrate of 10gb/s and for a distance of 30,000kms. The required number and fashion of OPC to be used for effective dispersion compensation were analysed. Simulation results were obtained using OPTSIM software from Rsoft.