17 November 2010 Design and analysis of waveguide grating coupling with gradually changing periods for optical interconnection
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Abstract
Waveguide grating couplers with gradually changing periods has good focusing effect to diffraction light; it can provide a compact, efficient coupling mechanism for optical interconnection. In this paper, a polymer waveguide grating couple to vertically couple and focusing for optical interconnection is proposed and designed. In order to estimate the coupling performance of the proposed coupler, the diffraction characteristics of a focusing waveguide grating coupler with gradually changing periods as an in/out-of-plane couple are investigated. The coupling efficiency and the intensities of the diffracted beams as functions of the grating groove depth are analyzed by solving the Helmholtz equation and the method of transfer-matrix. Their corresponding numerical simulation results are given. The grating periodicity fulfilling -1 order diffraction is designed, and excitation direction is calculated. With the optimized structure parameters showing the high coupling performance, the design of a waveguide grating coupling to vertically couple and focusing simultaneous for optical interconnection is obtained.
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Xianghua Feng, Jiarong Ji, Wenhua Dou, "Design and analysis of waveguide grating coupling with gradually changing periods for optical interconnection", Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 784823 (17 November 2010); doi: 10.1117/12.869680; https://doi.org/10.1117/12.869680
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