An efficient and tolerant chip-to-chip optical coupling approach employing silicon nitride grating couplers was proposed and investigated. The integration of bottom mirrors and the strategic extension of grating length led to notable results, with a peak coupling loss of -0.28 dB and a 1-dB alignment tolerance along the x-axis reaching 25.4 μm when using a grating length of 50 μm.
We demonstrate a high-efficiency silicon nitride grating coupler for perfectly vertical coupling. The directionality of the diffraction process is improved with the help of the bottom mirror and Bragg reflectors introduced in the design, leading to the minimal coupling loss of -0.52 dB at 1315.6 nm.
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