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Determination for Refractive-index Profile of Polymer Waveguide by Photobleaching

Liu Xiangmin Shen Qishun Cao Zhuangqi Chen Yingli (Department of Applied Physics, Jiaotong University, Shanghai 200030)  
It was demonstrated in the photobleaching experiment that the shrinkage effect of polymer film, could be fitted approximately by an exponentially decaying function. After taking into account of the shrinkage effect, the index profile of the polymer waveguide determined by data simulation is a Fermi function with the help of m lines method and the exact transfer matrix theory.
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