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设计并制造了一种熔嵌式多芯高双折射中空光纤。由于该结构光纤中纤芯和包层的几何非对称性,因而具有高双折射的特性,可用于克服纤内集成干涉仪的偏振衰退问题。利用有限元法分析了不同尺寸下模式双折射的变化情况,得出了增加纤芯长轴长度或减小内包层厚度可有效提高双折射的结论,并在1310nm波长处得到1.42×10-4的模式双折射。实验及分析结果表明,熔嵌式多芯高双折射中空光纤在纤内集成干涉仪的消偏振衰落方面具有一定的应用潜力,可用于制作具有保偏功能的纤内集成干涉仪。
A fused multi-core high birefringence hollow fiber was designed and fabricated. Due to the geometrical asymmetry of the core and the cladding in the structured fiber, it has the property of high birefringence and can be used to overcome the polarization degeneration problem of the fiber integrated interferometer. The change of mode birefringence under different sizes was analyzed by finite element method. The conclusion that increasing the length of the core’s major axis or reducing the thickness of the inner cladding can effectively increase the birefringence was obtained, and the result was 1.42 × 10-4 at 1310nm Mode of birefringence. Experiments and analysis results show that the fused multicore high birefringence hollow fiber has potential application in the depolarization fading of fiber integrated interferometer and can be used to fabricate the fiber integrated interferometer with polarization maintaining function.