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首页> 外文期刊>Journal of the Optical Society of America, A. Optics, image science, and vision >Propagation modes in a cylindrical dielectric waveguide with radially varying permittivity
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Propagation modes in a cylindrical dielectric waveguide with radially varying permittivity

机译：介电常数径向变化的圆柱形介质波导中的传播模式

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摘要

Computations are made of the mode parameter in a cylindrical dielectric waveguide whose perrnittivity is a function of the radius. The mode parameter, whose sign determines whether a mode is HE or EH, is computed as a function of the propagation constant and the values of the permittivities on each side of a cylindrical boundary in the waveguide. Fields in the waveguide are then computed as a function of the mode parameter. The expressions for the fields are valid when variations in the permittivity are large or when the permittivity is not continuous. The approach is demonstrated by computations of the mode parameter in two waveguides: one whose permittivity has a discontinuity at the interface between core and cladding and one whose permittivity is continuous everywhere. The characteristics of the propagation modes that arise from each case are described and compared with those of a cylindrical dielectric waveguide whose permittivity is constant in the core region and in the cladding region.
机译：计算是在圆柱电介质波导中的模式参数进行的，其介电常数是半径的函数。根据传播常数和波导中圆柱边界每一侧的介电常数的值，计算其模号决定其模式是HE还是EH的模式参数。然后根据模式参数计算波导中的场。当介电常数的变化较大或介电常数不连续时，这些字段的表达式有效。该方法通过计算两个波导中的模式参数得到了证明：一种波导的介电常数在纤芯和覆层之间的界面处具有不连续性，而另一种波导的介电常数在各处均具有连续性。描述了每种情况下产生的传播模式的特性，并将其与圆柱介电波导的特性进行比较，该介电常数在芯区和包层区均保持不变。

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