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外调制光纤有线电视发射机中一般采用预失真补偿技术以提高其复合三阶差拍失真指标。分析了在此情形下入射偏振对发射机复合三阶差拍失真补偿特性的影响 ,分析计算显示 :入射光偏振态模式为TE模时系统复合三阶差拍失真补偿特性最佳。对入射偏振态偏离TE模的情形的理论分析与实验研究表明 :为保证发射机的复合三阶差拍失真性能 ,入射光偏离TE模的角度应小于 15°
External modulation fiber optic cable TV transmitters generally use pre-distortion compensation technology to improve its composite third-order beat distortion indicators. The effect of incident polarization on the third-order compensated compensation of the beat of the transmitter is analyzed. The analysis shows that the third-order compensated compensation of the third-order beat is the best when the polarization state of incident light is TE mode. The theoretical analysis and experimental studies on the incident polarization state deviating from the TE mode show that: in order to ensure the third-order distorting characteristic of the transmitter, the angle of deviation of the incident light from the TE mode should be less than 15 °