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Beam propagation analysis for tapered waveguides: taking account of the curved phase-front effect in paraxial approximation

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3 Author(s)
Lee, Ching-Ting ; Inst. of Opt. Sci., Nat. Central Univ., Chung-Li, Taiwan ; Wu, M.-L. ; Jui-Ming Hsu

A novel equivalent waveguide theory based on the conformal mapping method is employed to investigate the tapered waveguide with curved phase fronts. By using the theory, the curved phase fronts of a tapered waveguide would be transformed into the planar ones of its equivalent straight-liked structure. Therefore, the paraxial beam propagation method can be used to analyze the equivalent structures of tapered waveguides (even for wide-angle tapers). Two kinds of popular tapered waveguides, including the cross-sectional dimension tapering and the constant V-number tapering, are used to analyze by our combination of conformal mapping method and beam propagation method (BPM)

Published in:

Lightwave Technology, Journal of  (Volume:15 ,  Issue: 11 )