OFDM signal transmission in optical fiber will be affected by the optical⁃fiber nonlinear effect. The nonlinear Schrodinger equation for OFDM signal transmission is solved by the distributed Fourier method. The impact of optical⁃fiber non⁃linear effect on the OFDM signal transmitted in fiber is analyzed. The relationship of the system average bit error rate versus the number of subcarriers and QAM modulation was obtained.% 正交频分复用信号在光纤中传输会受光纤非线性效应影响。利用分步傅里叶方法求解OFDM信号传输的非线性薛定谔方程，分析光纤非线性效应对光纤中OFDM信号的影响，获得了非线性效应影响下子载波数、QAM调制与系统平均误码率的关系。
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