多层漏包层光纤的双折射分析
Birefringence analysis of multilayer leaky cladding optical fibre
摘要：
本文用有限元法分析了多层漏包层（MLC）光纤，研究了MLC对两种结构的弯曲损耗和双折射的影响：（i）圆芯大模面积结构和（ii）椭圆小芯结构。在一个大的模式面积的结构中，我们验证了多层泄漏包层强烈歧视高阶模式，实现单模操作，光纤示出可忽略的双折射，和弯曲半径大于10厘米的光纤的弯曲损耗低。在椭圆小芯结构中，我们表明MLC降低了光纤的双折射。这防止了结构在任何偏离圆形几何形状的情况下变得双折射。这一研究结果对MLC光纤的高功率放大器、增益平坦化和色散补偿等方面的应用具有一定的指导意义。
英文摘要：
We analyse a multilayer leaky cladding (MLC) fibre using the finite element method and study the effect of the MLC on the bending loss and birefringence of two types of structures: (i) a circular core large-mode-area structure and (ii) an elliptical-small-core structure. In a large-mode-area structure, we verify that the multilayer leaky cladding strongly discriminates against higher order modes to achieve single-mode operation, the fibre shows negligible birefringence, and the bending loss of the fibre is low for bending radii larger than 10 cm. In the elliptical-small-core structure we show that the MLC reduces the birefringence of the fibre. This prevents the structure from becoming birefringent in case of any departures from circular geometry. The study should be useful in the designs of MLC fibres for various applications including high power amplifiers, gain flattening of fibre amplifiers and dispersion compensation.
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