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从理论上分析了入射到调制器的偏振态偏离ＴＥ模时对外调制光发射机组合二次失真（ＣＳＯ）和组合三次差拍（ＣＴＢ）的影响。得出在ＴＥ，ＴＭ模插入损耗相同时，传输５９个ＰＡＬ－Ｄ频道，在保证ＣＳＯ＝－７０ｄＢｃ时，偏离ＴＥ模的角度应小于６°。单频传输的实验结果和理论分析一致
The influence of the second-order distortion (CSO) and the combined third-order beat (CTB) on the external modulation optical transmitter is analyzed theoretically when the polarization state of the incident modulator is deviated from the TE mode. When the TE and TM modes have the same insertion loss, 59 PAL-D channels are transmitted. When the CSO = -70dBc is guaranteed, the deviation from the TE mode should be less than 6 °. The experimental results of single frequency transmission are consistent with the theoretical analysis