用三次样条函数恢复渐变折射率剖面
Recovery of graded index profile by cubic spline function
摘要：
本文提出了一种利用三次样条插值函数由渐变波导的有效折射率恢复折射率分布的方法。通过对几种典型折射率分布的数值分析，证明了该插值模型可以很好地再现折射率分布。该方法可以可靠地反演多模（多于4个导模）和少模（2-4个导模）波导的折射率分布。
英文摘要：
We present in this paper a method to recover the refractive index profile of graded waveguide from the effective indices by cubic spline interpolation function. It is proved by numerical analysis of several typical index distributions that the refractive index profile can be reconstructed closely to its exact profile with the presented interpolation model. This method can reliably retrieve index profile of both more-mode (more than 4 guiding mode) and fewer-mode (2-4) waveguides.
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