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Improved Numerical Method for Calculation of Bending Loss for an Annular Waveguide

GU Yong-di,HU Guo-hua,ZHANG Tong,CUI Yi-ping (Advanced Photonics Center,Dept.of Electronic Engineering, Southeast University,Nanjing 210096,China)  
In most integrated-optical devices, bent waveguide is widely used in which the losses have to be kept minimal. A combination of effective refractive-index and matrix approach based on matlab is present here for calculation of bending loss in PMMA polymer annular waveguide. Simultaneously, the result shows that if the refractive index in cladding is suitably modified, the bending loss can be made small. This provides a very useful thinking to optimize the polymer annular waveguide.
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