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提出了一种基于白光干涉原理的钛扩散铌酸锂(LiNbO3)集成光学相位调制器尾纤偏振串音测量方法,分析了白光干涉仪输出干涉信号与集成光学芯片和保偏尾纤对轴角度、偏振器起偏角度之间的关系。仿真结果表明:白光干涉仪输出的干涉包络与相位调制器的耦合点存在一一对应的关系,干涉包络的峰值反映了相位调制器的尾纤偏振串音。利用白光干涉仪对某型钛扩散LiNbO3集成光学相位调制器的尾纤偏振串音进行了实际测试,干涉图样中产生了与耦合点位置对应的干涉峰;常温下其输入、输出尾纤偏振串音分别为-34.5dB和-23.3dB;在-40℃～60℃范围内,尾纤偏振串音随温度升高而减小。实验结果验证了测量方法的可行性。
A crosstalk measurement method based on white light interference is proposed for titanium pigtailed lithium niobate (LiNbO3) integrated optical phase modulator (PMOA). The effects of white light interferometer output interference signal, integrated optical chip and polarization maintaining pigtail on axis angle , Polarizer angle between the relationship. The simulation results show that there is a one-to-one correspondence between the interference envelope of the white light interferometer output and the coupling point of the phase modulator. The peak of the interference envelope reflects the crosstalk polarization of the pigtails of the phase modulator. A white light interferometer was used to test the pigtailing polarization crosstalk of a titanium diffused LiNbO3 integrated optical phase modulator. The interferometric peak corresponding to the coupling point was generated in the interference pattern. The input and output pigtailed polarization strings The tones are -34.5dB and -23.3dB, respectively. At -40 ℃ ~ 60 ℃, the crosstalk of pigtails decreases with increasing temperature. The experimental results verify the feasibility of the measurement method.