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提出一种基于空气孔填充的光子晶体光纤与普通单模光纤低损耗耦合方法,并通过光束传播法数值仿真的方式研究了填充物折射率以及填充长度等参数对耦合损耗的影响。结果表明,选择合适的填充参数可以大幅度降低光子晶体光纤与普通单模光纤间的耦合损耗,从而实现光子晶体光纤与普通单模光纤间的低损耗耦合。该方法可适用于多种光子晶体光纤与普通单模光纤之间的低损耗耦合,在光子晶体光纤与普通单模光纤的模场严重失配的情况下,该方法的优势更为明显。
A low-loss coupling method based on air-hole filled photonic crystal fiber and ordinary single-mode fiber is proposed. The effects of refractive index and filling length of the filler on the coupling loss are studied by the numerical simulation of beam propagation method. The results show that the choice of suitable filling parameters can significantly reduce the coupling loss between photonic crystal fiber and ordinary single-mode fiber, so as to achieve low-loss coupling between photonic crystal fiber and ordinary single-mode fiber. This method can be applied to the low-loss coupling between a variety of photonic crystal fibers and ordinary single-mode optical fibers. The advantages of this method are more obvious when the mode field of photonic crystal fibers and ordinary single-mode optical fibers are seriously mismatched.