Switching of output coupling in a grating coupler by diffraction transition to the distributed Bragg reflector regime |
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| Authors: | Ura S Moriguchi H Kido S Suhara T Nishihara H |
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| Affiliation: | Department of Electronic Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan. ura@ele.eng.osaka-u.ac.jp |
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| Abstract: | In a proposed switching grating coupler (SGC), the grating period Lambda is chosen so that the SGC converts from a first-order grating coupler to a third-order distributed Bragg reflector by means of a small change in the guided mode index. The principle for switching the radiated wave power and the effective aperture of the SGC were experimentally confirmed by use of the thermo-optic effect of a polymer waveguide. The extinction of the peak intensity of the wave radiated by the SGC and collected by an external lens was measured to be 5 dB with a temperature change of 10 degrees. |
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