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Radiation losses of tapered dielectric waveguides: a finite difference analysis with ridge waveguide applications

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3 Author(s)
Zhang-Ning Lu ; Dept. of Electr. & Syst. Eng., Connecticut Univ., Storrs, CT, USA ; Bansal, Rajeev ; Cheo, Peter K.

The finite-difference third-order simplified wave equation method is used to study the radiation losses of optical waveguides with step (abrupt) and parabolic tapers, including the radiation losses of the tapered ridge waveguides used as electro-optic phase modulators for tuning the frequencies of infrared lasers. The radiation losses of the parabolic taper given by Burns et al. is found to be under 5%. The results of a step taper are compared with Marcuse's; and found to be in good agreement. The numerical results are also compared with those from the coupled wave equations used by Sporloder and Unger

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Lightwave Technology, Journal of  (Volume:12 ,  Issue: 8 )