Design of two-dimensional apodized grating couplers with Gaussian diffractive mode

Hua Wu; Chong Li; Qiaoli Liu; Bai Liu; Jian Dong; Lei Shi; Xia Guo

doi:doi:10.3788/COL201513.050501

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

Design of two-dimensional apodized grating couplers with Gaussian diffractive mode Download： 1058次

Hua Wu ^1,2Chong Li ¹Qiaoli Liu ¹Bai Liu ¹Jian Dong ¹Lei Shi ¹Xia Guo ^1,*

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

Figures & Tables

Fig. 1. Schematic of an apodized grating coupler: (a) side view; (b) top view. (c) Relationship of the equivalent refractive index neq,i and longitudinal grating period Λz,i with the lateral duty cycle fy,i. (d) Grating directionality as a function of BOX thickness.

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Fig. 2. Calculation results of the Gaussian function and the corresponding leakage factor distribution. Inset, relationship of the leakage factor αi with the duty cycle of the groove fy,i.

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Fig. 3. Value distribution along the longitudinal grating period number of duty cycle of the ith groove fy,i, equivalent refractive index neq,i of the grating grooves, and longitudinal grating period Λz,i for apodized grating couplers.

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Fig. 4. (a) Coupling efficiency versus wavelength of the apodized grating couplers in three feature sizes; (b) electric field intensity distribution when the light propagates in the grating couplers with gold bottom mirror at the wavelength of 1550 nm.

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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.

Design of two-dimensional apodized grating couplers with Gaussian diffractive mode Download： 1058次

Fig. 1. Schematic of an apodized grating coupler: (a) side view; (b) top view. (c) Relationship of the equivalent refractive index neq,i and longitudinal grating period Λz,i with the lateral duty cycle fy,i. (d) Grating directionality as a function of BOX thickness.

Fig. 2. Calculation results of the Gaussian function and the corresponding leakage factor distribution. Inset, relationship of the leakage factor αi with the duty cycle of the groove fy,i.

Fig. 3. Value distribution along the longitudinal grating period number of duty cycle of the ith groove fy,i, equivalent refractive index neq,i of the grating grooves, and longitudinal grating period Λz,i for apodized grating couplers.

Fig. 4. (a) Coupling efficiency versus wavelength of the apodized grating couplers in three feature sizes; (b) electric field intensity distribution when the light propagates in the grating couplers with gold bottom mirror at the wavelength of 1550 nm.

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Design of two-dimensional apodized grating couplers with Gaussian diffractive mode Download： 1058次

Fig. 1. Schematic of an apodized grating coupler: (a) side view; (b) top view. (c) Relationship of the equivalent refractive index neq,i and longitudinal grating period Λz,i with the lateral duty cycle fy,i. (d) Grating directionality as a function of BOX thickness.

Fig. 2. Calculation results of the Gaussian function and the corresponding leakage factor distribution. Inset, relationship of the leakage factor αi with the duty cycle of the groove fy,i.

Fig. 3. Value distribution along the longitudinal grating period number of duty cycle of the ith groove fy,i, equivalent refractive index neq,i of the grating grooves, and longitudinal grating period Λz,i for apodized grating couplers.

Fig. 4. (a) Coupling efficiency versus wavelength of the apodized grating couplers in three feature sizes; (b) electric field intensity distribution when the light propagates in the grating couplers with gold bottom mirror at the wavelength of 1550 nm.

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