Pivotal Characteristics Of Optical Orthogonal Frequency Division Multiplexing System Based On Wavelet Transform

With the deepening process of information society, the demand for information transmission rate is accelerating rapidly, which is pushing optical fiber communication systems evolving towards higher transmission rate. In order to meet demand for higher speed, larger capacity and ultra-long haul transmission, the researchers designed a variety technique of modulation and multiplexing. In this paper, pivotal characteristics of optical orthogonal frequency division multiplexing system based on waverlet transform were studied, especially for the most important effects:Four Wave Mixing (FWM) effect and Polarizing membrane dispersion (PMD).In this paper, several commonly used wavelet function family was chosen to structure orthogonal frequency division multiplexing system.The effects of different wavelet function used in corresponding orthogonal frequency division multiplexing systems were theoretical analyzed. Comparison between wavelet based orthogonal frequency division multiplexing systems and traditional orthogonal frequency division multiplexing system were analyzed, which may provide a theoretical reference for the design of orthogonal frequency division multiplexing system based on wavelet transform. Meanwhile, Volterra series Transfer Function model of nonlinear Schrodinger eqution was used to study both of the wavelet based orthogonal frequency division multiplexing systems and traditional orthogonal frequency division multiplexing system. The approximate solution was obtained, based on which the expression of four wave mixing was isolated and simulated to provide a theoretical basis for the optimizaion of wavelet based orthogonal frequency division multiplexing system.The simulation showed that:(1) most of the wavelet based WT-OFDM systems performed better on noise immunity.(2) WT-OFDM system mantain the ability to suppress peak to average ratio which wan20percent less than FT-OFDM system.(3) The FWM power of WT-OFDM was5percent lower than that of FT-OFDM system at the transmission rate of80Gb/s.