椭圆包层光纤场的迭代近似解与漏模损耗计算

试图理论上处理椭圆包层各向异性光纤复杂的折射率分布。数学过程包括折射率分布的级数展开、δ－涵数的导数和积分以及用格林函数求解方程的迭代技术。给出了椭圆包层各向异性光纤漏模损耗的解析表达式。数值结果表明椭圆包层各向异性光纤的漏模损耗比领结型光纤小，比阶跃型各向异性光纤大；偏心率越大越有利于制造单模单偏光纤。

Iterative Solution and Leaky Losses of Fiber with Elliptical Cladding

This paper deals with theoretically the complicated index profile of an anisotropic fiber with an elliptical cladding. The mathematical steps taken in our analysis include the use of a series expansion of the index profile, the treatment of integral and derivative of a delta function and an iterative technique to obtain the Green functions of the optical field. Analytical expression of leaky losses of the fiber is given. Numerical examples show that the leaky losses of a fiber with an elliptical cladding are higher than thatof an anisotropic step-index fiber, lower than that of a bow- tie fiber. With eccentricity increasing a single-mode single-polarization fiber is easier to make