增大第一纤芯的有效模场面积将导致开关的阈值增大。
With the increase of the effective mode field area of the first core, the switch threshold power increases.
通过在靠近纤芯处加上一层掺氟玻璃，能有效降低带隙内光子的限制损耗。
Confinement loss can be effectively lowered by adding a layer of F-doped glass near the core of this fiber.
推导出纤芯、包层、薄膜层、环境层的场分布表达式，利用数值计算求出了包层膜的有效折射率。
Resolve dispersion equation and obtain the effective refractive index of cladding using method of numerical calculation.
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