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针对传统圆形空气孔结构光子晶体光纤的双折射系数不大,制备复杂等问题,本文设计了一种新型椭圆空气孔结构光子晶体光纤,采用有限元法分析不同结构参数下基模模场、损耗特性、双折射特性。结果表明,新的椭圆形空气孔PCF可产生双折射,限制损耗可达,且、方向上基模能量的损耗值相差数十倍,可实现光的偏振传输,制作保偏光纤。
Aiming at the problems such as small birefringence coefficient and complex preparation of traditional circular air-hole structure photonic crystal fiber, a new type of elliptical air-hole structure photonic crystal fiber is designed. The finite element method is used to analyze the mode field, Loss characteristics, birefringence characteristics. The results show that the new elliptical air hole PCF can produce birefringence and limit the loss up to several tens of times the loss of fundamental mode energy in direction, which can realize the polarization transmission of light and make the polarization maintaining fiber.