Kashima N, Uchida N, Ishida Y
Appl Opt. 1977 Oct 1;16(10):2732-7. doi: 10.1364/AO.16.002732.
An equation has been derived using an electromagnetic theory for evaluating excess loss caused by the outer layer (jacket) coated around the cladding in a multimode step-index fiber. Using the derived equation for the LP modes, numerical calculations have been made by varying parameters such as fiber and jacket parameters, wavelength, and mode power distribution. The calculations have revealed that the excess loss is especially influenced by the refractive index of the jacket, cladding thickness, and mode power distribution in the fiber.
利用电磁理论推导了一个方程，用于评估多模阶跃折射率光纤包层周围外层（护套）引起的额外损耗。使用推导得到的关于LP模式的方程，通过改变诸如光纤和护套参数、波长以及模式功率分布等参数进行了数值计算。计算结果表明，额外损耗尤其受到护套折射率、包层厚度以及光纤中模式功率分布的影响。
