A Long Reach Coherent m-QAM OFDM PON Downstream Transmission

Abstract

In this paper OFDM-PON downstream transmission is demonstrated over different length of fiber at Remote Node (RN) for different m-QAM mapped OFDM signal (m = 4 and16) transmission from the central office (CO) for data rates (10 Gbps) using coherent detection at the user end or optical network unit (ONU). Investigation is performed with different number of sub-carriers back to back optical signal to noise ratio (OSNR) along with transmitted and received constellation diagram for m-QAM mapped coherent OFDM downstream transmission at different speed over different transmission distance. Simulation results suggest the different length and data rate that can be used for different m-QAM mapped coherent detection OFDM downstream transmission and the proposed system may be implemented in Next Generation high speed PONs (NG-PONs).