2 results about "Nonlinear waveguide" patented technology

This invention discloses an on-chip nonlinear waveguide mode conversion device and its fabrication method based on ferroelectric domain engineering. The device includes a Z-cut thin-film lithium niobate waveguide, which, from top to bottom, comprises a Z-cut thin-film lithium niobate, a silicon dioxide layer, and a silicon substrate. The Z-cut thin-film lithium niobate layer has a two-dimensional ferroelectric domain structure with periodically alternating positive and negative domains. The electrode structure for fabricating this two-dimensional ferroelectric domain structure consists of n+1 groups of comb-shaped electrodes arranged alternately, with the electrodes insulated from each other. Each group of comb-shaped electrodes is periodically arranged, with the electrode width being 1 / 4 of the polarization period, and n being the number of nodes in the target transverse electric field. This invention utilizes high-voltage electric field polarization technology and semiconductor fabrication processes to fabricate a Z-cut thin-film lithium niobate waveguide with a two-dimensional ferroelectric domain structure on a thin-film lithium niobate material platform, thereby solving the nonlinear conversion problem from the fundamental mode to the second harmonic higher-order mode of the waveguide, and also exhibits scalability.

This invention provides a broadband phase-matching control method, system, device, and storage medium, belonging to the field of integrated photonics technology. The method includes: acquiring dispersion parameters and pump parameters, calculating phase mismatch parameters at each frequency point; calculating the optimal nonlinear action length at each frequency point and establishing a mapping relationship between frequency and optimal nonlinear action length; constructing a spatial action length scheduling function and converting it into a control parameter distribution for the corresponding nonlinear action process, thereby scheduling and controlling the nonlinear action process in the nonlinear waveguide; during the execution of the scheduling control, acquiring the output parameters for each frequency channel and updating the spatial action length scheduling function to output the multi-frequency channel output results. This invention achieves adaptive scheduling control of the multi-frequency channel nonlinear action process under broadband conditions, thereby improving the consistency and stability of the output of each frequency channel.