在双芯PCF的基础上设计一种新型定向耦合器,根据波导间相互耦合原理,采用时域有限差分法分析了该器件的光传输特性.并数值计算了双芯PCF的结构参量对耦合性能的影响,发现其耦合长度随着空气填充率d/A的减小而增大,随着传输波长λ的增大而减小.并基于双芯PCF结构,以常用通信波长为例,设计出0.85/1.55 μm,0.98/1.55 μm和1.3/1.55 μm的超微型波分复用器件,通过调节双芯PCF的结构参量得到合适的耦合长度,实现了不同波长的解复用.研究表明双芯PCF耦合器在波分复用等方面具有很大的应用价值.%A novel directional coupler is designed based on twin core PCF. The optical properties of the device have been demonstrated by finite difference time domain according to the waveguides directional coupling principle. We also study the influence of the structural parameters of the twin core PCF's cladding. It is found that the coupling length increases with the increasing of d/A and decreases with the increasing of wavelength. On the basis of this structure, ultra-compact WDM is designed in details as examples for 0.85/1.55 μm ,0.98/1.55 μm and 1.31/1.55 μm. By tailoring other structural parameters, two wavelengths can be separated completely. The results indicate that these properties enable such devices to find great potential applications in wavelength division multiplexing.
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