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In this research paper comparison of efficient binary modulation formats like Chirped-NRZ, Chirped-RZ, RZ-50%, Duobinary and AMI is carried out for GPON networks. Their performance is evaluated in terms of bit rates versus fiber link length. Chirped-NRZ comes out to be optimal modulation format for high speed and long reach optical communication. Quality of the received signal is analyzed by considering parameters like Q-factor and BER. Three different data rates i.e. 10 Gbps, 40 Gbps and 100 Gbps are selected to evaluate the performance of optical communication system whereas optical fiber length is varied from 40 km to 140 km. Simulations are performed on licensed version of Optisystem v.14. [ABSTRACT FROM AUTHOR]