在单信道系统中光纤的非线性主要是自相位调制SPM,自相位调制将导致光信号频谱 展宽。利用Optisystem仿真非线性效应对各种码型的影响,仿真模型主要由码型产生模块、 非线性模块、光谱分析仪组成。各码型信号经非线性模块作用后,其输出频谱与其原始频 谱比较,得到结果如图8-1,8-2,8-3。 Optical Spectrum Analyzer 国 Optical Spectrum Analyzer Dbl Click On Objects te ope^n properties. Meve Objects with Mouse Drag Optical Spectrum Analyzer s Optical Spectrum Analyzer Dbl Click On Objects to open properties. Move Objects with Mouse Drag Signal Index: Auto Set -Wavelength Units: |m 二| Automatic『ange Center: |-006 m Start: | e-006 m Stop: |l 57284e-006 m Amplitude Units: | dBm 三| Automatic『ange Max: