Apodized grating coupler using fully-etched nanostructures |
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| Affiliation: | 1.Photonic Device Research Laboratory, College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China;2.College of Physics and Electronic Information, GanNan Normal University, Ganzhou 341000, China;3.State Key Laboratory for Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;4.School of Science, Minzu University of China, Beijing 100081, China |
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| Abstract: | A two-dimensional apodized grating coupler for interfacing between single-mode fiber and photonic circuit is demonstrated in order to bridge the mode gap between the grating coupler and optical fiber. The grating grooves of the grating couplers are realized by columns of fully etched nanostructures, which are utilized to digitally tailor the effective refractive index of each groove in order to obtain the Gaussian-like output diffractive mode and then enhance the coupling efficiency.Compared with that of the uniform grating coupler, the coupling efficiency of the apodized grating coupler is increased by 4.3% and 5.7%, respectively, for the nanoholes and nanorectangles as refractive index tunes layer. |
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| Keywords: | grating couplers equivalent refractive index mode matching coupling efficiency |
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