Performance Evaluation of GPON Access Network Technologies

Abstract

Optical fiber plays an important role in the revolution of communication technologies as one of the most powerful access network technologies Passive Optical Network (PON) is a point to multi point (P2MP) network what consist of an Optical Line Terminal (OLT) located at the provider central office, Optical Distribution Network (ODN) and Optical Network Terminal (ONT) that located at the end-user’s premises. Gigabit passive optical network (GPON) is one of Time Division Multiplexing (TDM) PON or (WDM) Wavelength Division Multiplexing. This technology lowers network costs, energy consumption, and lower maintenance requirements and it also provides more bandwidth. The thesis considers a real case study for an existing network what suffering from a limitation in its bandwidth, fiber length and optical power, to overcome this, five simulation scenarios were done by Optisys-Optiwave v.7 and the parameters were gradually changed. The research tests a different values of bit rates, optical power and fiber length in the scenarios for both upstream and downstream directions It was observed at the changes of optical power values -3~10 dbm, bit rates start from 622/155 M ~10/10G and distance from 15 km ~40. The achieved results changed gradually from 37.1708 ~ 115.5180 for Quality factor(acceptable value is 6) that almost improved with 310 times, also the Bit Error Rate (its minimum acceptable value is10−9) changes from 1.31573𝑥10−19 reached to 1.392 𝑥10−285 that is near to 1500%.That conclude the obtained results were exceeded the excellent values for both Q-Factor and Bit Error Rates.