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通过热极化可以使中心对称的熔石英光纤中产生二阶非线性效应和线性电光效应。为了解各热极化过程参量对热极化产生的线性电光效应的影响,利用全保偏光纤马赫曾德尔干涉仪构造了一套光纤热极化的实时线性电光效应测试系统,并利用其进行了光纤热极化全过程的监控测试。在线测试了热极化过程的一些参量,例如极化电压、极化时间、以及极化温度等对热极化光纤中产生的线性电光效应的影响。实时测试研究表明,在光纤中施加尽可能高的极化电场将可能在光纤中产生较高的线性电光效应。对侧边抛磨光纤结构的热极化器件,考虑到器件的抗强电场击穿能力,可选用3.0~4.0 kV左右的极化直流电压。当施加3.0 kV左右的极化电压时,热极化优化时间约为16 min,最佳热极化加热温度约为190 ℃。
Second-order nonlinear effects and linear electro-optic effects can be produced in centrosymmetric fused silica fibers by thermal polarization. In order to understand the influence of the parameters of the thermal polarization process on the linear electro-optic effect caused by the thermal polarization, a set of real-time linear electro-optical effect test system of optical fiber polarization was constructed by using fully-preserved fiber Mach-Zehnder interferometer. The whole process of optical fiber thermal polarization monitoring test. Some parameters of the thermal polarization process, such as the polarization voltage, the polarization time, and the polarization temperature, were tested online to determine the effect of linear electro-optic effect in the thermally polarized fiber. Real-time testing studies have shown that the application of polarized electric fields in the fiber as high as possible will produce higher linear electro-optical effects in the fiber. On the side of the polished optical fiber structure of the thermal polarization device, taking into account the device against strong electric field breakdown capability, optional 3.0 ~ 4.0 kV polarization DC voltage. When the polarization voltage of about 3.0 kV is applied, the optimization time of the thermal polarization is about 16 min and the optimal temperature of the thermal polarization heating is about 190 ° C.