Performance optimization of coherent detection OFDM using different QAM modulation technique

Abstract

In this paper, coherent optical OFDM system model is proposed. OFDM is a numerous carrier modulation approach which segregates the accessible spectrum into subcarrier, among every subcarrier attaining a low data rate stream. OFDM is considered as a best method for satisfying the increasing demand of bandwidth in broadband services. The simulation based results are presented for Coherent detection based WDM optical OFDM system of 512 subcarrier at 4-QAM and 16-QAM modulation technique. The proposed simulation model helps in improving the system capacity, speed and performance. Four different frequency channels with same power are used and their effects on the output in terms of Q factor, minimum BER is analyzed by using opti -system software.