Bidirectional 64-QAM OFDM-over-fiber transmission on single carrier PON

Abstract

An Orthogonal Frequency Division Multiplexing (OFDM) over fiber based Passive Optical Network (PON) is proposed to cater high data rates to densely populated users in an organization such as a university campus. Performance of a single-carrier fiber-optic bidirectional transmission link carrying Quadrature Amplitude Modulated (16/64-QAM) symbols on OFDM carriers is investigated and demonstrated through simulation. The bidirectional link is based on coherent detection and is designed for carrying 10 Gbps QAM-OFDM signals over a 5-km standard Single Mode Fiber (SMF) between a central office and 32 wireless Access Points (APs). Same optical carrier is utilized for downstream and upstream transmission assuming that a dynamic bandwidth allocation scheme is applied through an ad-hoc network constituted among wireless APs at the distribution end of the network. Bit-error-rates (BERs) of order of 10−3 to 10−5 are achieved when performance of the OFDM-over-fiber is analyzed for electrical signals at wireless APs.