Calculation of the slit width of the grating coupler
Engineering Insight: To achieve high Linear Dispersion (D l), our engineers calculate the exit slit width based on the reciprocal linear dispersion (P): P = m⋅f d⋅cosβ (where f is the focal length of the collimating mirror). Design a grating coupler connecting a single-mode fiber on the surface of a photonic chip to an integrated waveguide. The built-in particle swarm optimization tool is used to maximize the coupling efficiency, and a compact model in INTERCONNECT is created using the component S-parameters. OmniSim includes a Surface Grating Coupler Design Utility to automatically design and simulate surface grating couplers in 2D and 3D. For example, spectra recorded at slit widths of 46, 64, 108, and 153 µm show clear shifts in performance. Gratings in a monochromator help spread light efficiently across detector arrays, which boosts speed and signal quality. The promise of silicon nanophotonic devices is constrained by the large inherent size difference between comparatively large optical fibers and much smaller photonic waveguides, which causes an unacceptable amount of loss without a mode size conversion solution.
Read More
