Integrated Optical Channel-Guide Vertical Couplers in Glass for Edge Coupling to Hybrid Photodetectors
An integrated optical vertical directional coupler, consisting of a graded-index channel buried waveguide in glass and a dielectric overlayer, is designed and realized to provide an optimum edge coupling to a modelled GaAs photodetector. Calculations of the attenuation coefficient and coupling efficiency show an optimum absorption behavior. The use of the index profile modelling via diffusion equation simulations and a three-dimensional finite-difference vector beam propagation method to simulate the device performance is presented. A comparison between the theoretical and experimental results for coupling length and power transfer ratio is made.
KeywordsLithium Niobate Coupling Efficiency Index Profile Coupling Length Surface Guide
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