OOFDM technique could be classified into two categories based on detection techniques - direct detection and coherent detection. Optical OFDM (OOFDM) technology has witnessed increase of interest in recent years. OFDM uses digital signal processing of fast-fourier transforms (FFTs) to obtain high sub-carrier density and computationally-efficient phase and amplitude equalization. OFDM offers robustness against channel dispersion and ease of phase and channel estimation in a time-varying environment. The spectrum has been utilized much more efficiently by spacing the channels much closer together. OFDM is based on Multi carrier transmission which transforms a high data rate signals into a group of parallel low data rate signals which are transmitted over subcarriers. INTRODUCTION Orthogonal Frequency Division Multiplexing (OFDM) has emerged as leading technology for high data rates due to its robustness and flexibility in resource allocation. Performance evaluation has been carried in terms of SNR (Signal to noise ratio) and BER (bit error rate).in present research OPTSIM and MATLAB has been used as Simulation tools. In this work an optical OFDM system is designed using different M-ary QAM (Quadrature amplitude Modulation) techniques by varying M to 16, 65, 256. 2 Guru Nanak Dev University, Amritsar,India Abstract OFDM (Optical Orthogonal Frequency Division Multiplexing) in the optical domain is an emerging technology for fulfilling increased bit rate demand of real time sophisticated applications. Singh 2 1 Chitkara University/ School of electronics and Electrical Engineering, Punjab, India. on Recent Trends in Information, Telecommunication and Computing, ITC Performance Evaluation using M-QAM Modulated Optical OFDM Signals Harsimran Jit Kaur 1 and Dr.M.
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