Abstract
Orthogonal Frequency Division Multiplexing(OFDM) has recently emerged in optical communication to support high data transmission rates over the dispersive channels. The OFDM technique provides combat to the various limitations such as chromatic dispersion, modal dispersion etc. existing in optical communication system. In order to achieve the improved performance of optical OFDM system, the effect of parameters related to laser source and optical fiber and nonlinearities of Mach-Zehnder Modulator(MZM) etc. must be considered in detail. Despite many advantages of OFDM technique, it has major drawbacks of high peak-to-average power ratio, sensitivity to carrier frequency offset and phase noise. This paper presents optical-OFDM system design for both single mode and multimode fibers along with the analysis of different modelling parameters and various performance parameters like Bit Error Rate (BER), Q factor etc. Further, effect of MZM nonlinearities on the system performance is also considered. Keywords:Optical OFDM (O-OFDM), Quadrature Amplitude Modulation(QAM), Mach-Zehnder Modulator (MZM), Fast Fourier Transform (FFT), Inverse Fast Fourier Transform (IFFT), Intersymbol Interference (ISI), Bit Error Rate (BER).
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