Cartledge J C
Appl Opt. 1978 Jul 1;17(13):2086-91. doi: 10.1364/AO.17.002086.
The modal excitation efficiency of a doubly clad optical fiber is determined by using an approximate method which utilizes a series representation of the incident beam in terms of the orthogonal waveguide modes. The dependence of the excitation efficiency on the refractive index difference between the outer and inner cladding, the beam radius of curvature and spot size, as well as a tilt or offset misalignment is investigated. These factors have a pronounced effect on the efficiency and practical tolerances for efficient mode launching may be obtained from the results.
通过一种近似方法来确定双包层光纤的模态激发效率，该方法利用入射光束在正交波导模式方面的级数表示。研究了激发效率对外包层与内包层之间的折射率差、光束曲率半径和光斑尺寸以及倾斜或偏移失准的依赖性。这些因素对效率有显著影响，并且可以从结果中获得高效模式发射的实际公差。
