新型高双折射率高灵敏度光子晶体光纤设计

Design of a novel high birefringence and high sensitivity photonic crystal fiber

针对现有光子晶体光纤(PCF)结构复杂、不易制造且灵敏度低的问题,设计了一种用于液体传感的新型高双折射率高灵敏度PCF。这种光纤的纤芯中引入了2种尺寸不同的椭圆形空气孔,而包层则是由相同尺寸的圆形空气孔按四边形排列组成的。利用有限元法结合完美匹配层边界条件,借助COMSOL Multiphysics模拟软件对该PCF进行了数值模拟。将水作为传感液体注入纤芯,在1.3~1.8μm的波段范围内对光纤的双折射、限制损耗以及灵敏度进行了详细的分析。研究结果表明:随着波长的增加,新型PCF的双折射率达到了10-2数量级;在波长为1.3μm时,其灵敏度高达54.4%,相较于已有PCF,提升幅度高达1.1~2.5倍。

A novel high birefringence sensitivity photonic crystal fiber(PCF)for liquid sensing is designed to address the issues of complex structure,difficulty in manufacturing,and low sensitivity of existing PCF.The core of this optical fiber introduces two different sizes of elliptical air holes,and the cladding is composed of circular air holes of the same size arranged in a square-lattice.By combining finite element method with perfectly matched layer boundary conditions,the PCF is numerically simulated using COMSOL Multiphysics simulation software.Water is injected into the fiber core as a sensing liquid,and the birefringence,confinement loss,and sensitivity of the fiber are analyzed within the working wavelength range of 1.3~1.8μm.The research results indicate that as the wavelength increases,the birefringence of the new PCF reaches the order of 10-2.At a wavelength of 1.3μm,its sensitivity is as high as 54.4%,which is 1.1~2.5 times higher than the existing PCF.