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利用全矢量有限元法研究了一种混合导引型光子晶体光纤在纤芯折射率改变时,光纤导光机理和模式的演变特性.当纤芯折射率小于混合包层中空气孔包层的有效折射率时,芯模的导光机理为“双带隙导引型”;当纤芯折射率位于空气孔和高折射率两套包层的有效折射率之间时,芯模的导光机理为“单带隙+全内反射导引型”;当纤芯折射率大于高折射率棒包层的有效折射率时,芯模的导光机理为“全内反射导引型”.并对该光纤在上述三种条件下的导光特性进行了比较和讨论.这些结果对设计特殊用途的光子晶体光纤具有指导意义.
The full-waveguide finite element method is used to study the evolution characteristics of the guided-light mechanism and mode of mixed-guided photonic crystal fiber when the refractive index of the core is changed. When the refractive index of the core is less than that of the cladding When the effective refractive index, the guide mode of the core mold is “double-band gap guide type”; when the core refractive index is located between the effective refractive index of the air hole and the high refractive index cladding, the core guide Light mechanism is “single band gap + total internal reflection guide ”; when the core refractive index is greater than the effective refractive index of the high refractive index rod cladding, the light guide mechanism of the core mode is "total internal reflection guidance The optical characteristics of the optical fiber under the above three conditions were compared and discussed.These results are of guiding significance for the design of special purpose photonic crystal fiber.