With the growing demand for users higher speed, reliable data transmission become the great need for the users. For the higher bit rate and flexible bandwidth wavelength Division Multiplexing (WDM) network is one of the best solutions. The performance of WDM mainly depends upon factor such as modulation format used in the networks. In this paper comparison of various Advanced Modulation Formats has been carried over the 8 channel Bidirectional WDM PON. Fiber without having amplifier and Dispersion compensating fibers. A network without any amplifier and repeaters reduces the network operation effectively, thus simplifying system configuration and maintenance cost. Hence, the system performance is not increased by using any sort of amplifiers and DCF. The designed system has achieved a maximum transmission distance of 120 km at the power of 0-2 dbm over Bidirectional Multimode fiber. This simulation work has done in optic system 14.1 Suite Software.