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采用全矢量有限元方法进行光纤设计优化,得到横截面上失去两层空气洞的双芯光子晶体光纤,可用于液压传感.优化的双芯光子晶体光纤的模场半径和数值孔径与单模光纤基本一致,在优化的双芯光子晶体光纤和单模光纤之间有一个相对较低的熔接损耗.计算结果表明由模场半径和数值孔径导致的不匹配造成的总共损耗可低至0.026dB,低于传统光子晶体光纤和单模光纤0.1dB的直接熔接损耗.对基于20cm双芯光子晶体光纤的液压传感器的性能进行研究,结果表明在0~500 MPa量程内的灵敏度为-1.6pm/MPa.
The full-fiber finite element method is used to optimize the optical fiber design, and a dual-core photonic crystal fiber with two holes lost in cross-section can be obtained, which can be used for hydraulic sensing. The mode field radius and numerical aperture of the optimized dual- The fibers are basically the same with a relatively low splice loss between the optimized two-core photonic crystal fiber and the single-mode fiber.The calculation shows that the total loss caused by the mismatch between the mode field radius and the numerical aperture can be as low as 0.026 dB , Which is lower than that of the conventional photonic crystal fiber and single mode fiber by 0.1dB.The performance of the hydraulic sensor based on 20cm dual-core photonic crystal fiber is studied.The results show that the sensitivity in the range of 0 ~ 500 MPa is -1.6pm / MPa.