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提出了一种同时基于全内反射和光子带隙效应两种导光机制的双芯光子晶体光纤(PCF),并采用全矢量有限元法对其耦合特性进行了分析。该种光子晶体光纤双芯间的耦合不同于基于单一导光机制的双芯光子晶体光纤,出现了超模交替截止、耦合长度存在极大值等现象,光纤两纤芯间高折射率柱的谐振在双芯间的耦合过程中起着重要的作用。通过改变光纤中空气孔的大小及间距可以显著改变光纤的耦合长度,而改变高折射率柱的折射率可对耦合长度极大值的位置进行调节。
A dual-core photonic crystal fiber (PCF) based on both total internal reflection and photonic bandgap effects is proposed and its coupling characteristics are analyzed by full vector finite element method. The coupling between the two cores of the photonic crystal fiber is different from that of the double-core photonic crystal fiber based on a single light guide mechanism. The supermodules alternately turn off and the coupling length has the maximum value. The phenomenon of the high refractive index between the two fibers of the optical fiber Resonance plays an important role in the coupling process between two cores. By changing the size and pitch of the air holes in the fiber, the coupling length of the fiber can be significantly changed, and the position of the coupling length maximum can be adjusted by changing the refractive index of the high refractive index column.