ANALYSIS OF BIDIRECTIONAL LONG REACH WDM PON

Abstract — Passive Optical Network (PON) implementing WDM plays a vital role in telecommunication system, due to its characteristics such as low energy consumption and higher bandwidth. In a bidirectional PON both upstream and downstream transmission can be done through the same fiber. This work demonstrates an architecture of PON system based on Fabry-Perot laser Diode (FP-LD) with two cascaded Array Waveguide grating (AWG). The architecture is expected to be effective and low cost compared to standard WDM bidirectional PON. AWG is used to multiplex or demultiplex different wavelengthsin WDM PON. FP-LD is used at the Optical Network Unit (ONU) as transmitter,which re-modulate the downstream signal with upstream data and re-sent upstream towards the central office. It can reduce cost of ONU. Further more, performance analysis of various architectures of WDM PON and the effects of nonlinearities in them and the bidirectional traffic in WDM PON have been done by using OptiSystem software. Various performance characteritics such as, BER, Q Factor are investigated