Chinese Optics Letters, 2015, 13 (5): 050501, Published Online: Sep. 20, 2018  

Design of two-dimensional apodized grating couplers with Gaussian diffractive mode Download: 1047次

Author Affiliations
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
Abstract
Two-dimensional apodized grating couplers are proposed with grating grooves realized by a series of nano-rectangles, with the feasibility of digital tailoring the equivalent refractive index of each groove in order to obtain the Gaussian output diffractive mode in order to enhance the coupling efficiency to the optical fiber. According to the requirement of leakage factor distribution for a Gaussian output profile, the corresponding effective refractive index of the grating groove, duty cycle, and period are designed according to the equivalent medium theory. The peak coupling efficiency of 93.1% at 1550 nm and 3 dB bandwidth of 82 nm are achieved.

Hua Wu, Chong Li, Qiaoli Liu, Bai Liu, Jian Dong, Lei Shi, Xia Guo. Design of two-dimensional apodized grating couplers with Gaussian diffractive mode[J]. Chinese Optics Letters, 2015, 13(5): 050501.

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