光码分多址(OCDMA)系统的误码率是评价系统性能的重要指标,由于色散和非线性效应会导致超短光脉冲在光纤传输过程中脉宽的展宽,进而影响OCDMA系统的误码率。在基于理想情况的OCDMA系统误码率定义的基础上,研究了三阶色散和三阶非线性效应对系统误码率的影响,进一步分析了有硬限幅器和二维OCDMA系统的误码率。结果表明,三阶色散和三阶非线性效应都会导致OCDMA系统误码率的增大,但三阶非线性效应对系统性能影响没有三阶色散效应明显;在系统参数相同基础上,接收端引入光硬限幅器和系统采用二维编码均可优化系统性能。 The bit error rate of optical code division multiple access (OCDMA) system is an important index to evaluate the performance of the system. Due to dispersion and non-linear effects, the pulse width of ultrashort optical pulse during optical fiber transmission will be widened, which will affect the error of OCDMA system rate. Based on the definition of the bit error rate of OCDMA system based on the ideal situation, the influence of the third-order dispersion and the third-order nonlinearity on the bit error rate of the system is studied. The error codes with hard limiter and two-dimensional OCDMA system are further analyzed rate. The results show that both the third-order dispersion and the third-order nonlinearity increase the bit error rate of the OCDMA system, but the third-order nonlinearity has no obvious effect of the third-order dispersion on the system performance. On the same system parameters, the receiving end introduces Optical hardware limiters and systems use two-dimensional encoding to optimize system performance.