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光纤四波混频是导致ＯＦＤＭ系统的信噪比、接收灵敏度和误码率上升的主要非线性作用之一．本文从理论上分析了ＡＳＫ直接检测ＯＦＤＭ系统中四波混频对信噪比信道间串话及检测功率的恶化的影响，得出了在ＡＳＫ直接检测ＯＦＤＭ系统中四波混频光波功率和信号功率恶化系数随光纤参数和信号参数变化的关系，并以三信道ＯＦＤＭ为例作了数值分析．
Fiber-optic four-wave mixing is one of the main nonlinear effects that lead to the increase of signal-noise ratio, receiver sensitivity and bit error rate of OFDM systems. In this paper, the influence of four-wave mixing on the cross-talk and the deterioration of detection power in ASR direct detection OFDM system is analyzed theoretically. The results show that when ASK directly detects the power and signal of four-wave mixing optical wave in OFDM system, The power degradation coefficient depends on the relationship between fiber parameters and signal parameters. The numerical analysis of three-channel OFDM is given.