Optical waveguide dispersion regulation and control device for nonlinear process and design method thereof

Abstract

The invention provides an optical waveguide dispersion regulation and control device for a nonlinear process and a design method of the optical waveguide dispersion regulation and control device. Broadband phase matching under multi-degree-of-freedom control can be realized by dividing the optical waveguide into a plurality of sections of waveguides with periodically changing widths. Firstly, therelation between the wave vector mismatch amount of light participating in the second-order nonlinear process and the waveguide width is obtained through numerical simulation, and the width and lengthof each section of waveguide can be found and optimized through an optimization algorithm according to global overall planning. The phase mismatch amount brought by each section is calculated, the phase differences introduced by all sections of waveguides are mutually counteracted in an optimized nonlinear period, a flat phase difference frequency spectrum is obtained, finally, the average wave vector difference of the nonlinear process of the concerned wavelength range is close to 0, and then large-bandwidth nonlinear phase matching is achieved. According to the invention, the existence of aphase matching working point in the integrated optical waveguide is ensured, and the bandwidth of phase matching can be further improved.

Description

technical field [0001] The invention relates to an optical waveguide dispersion control device used in a nonlinear process and a design method thereof, belonging to the field of optical nonlinear technology. Background technique [0002] Optical nonlinear processes are widely used in the generation of optical signals. In this way, the frequency of lasers can be greatly extended at low cost, especially to achieve long-span wavelength conversion. To realize the optical nonlinear process, the participating optical signals must satisfy the two conditions of energy conservation and phase matching at the same time. However, since phase matching is limited by dispersion, it is difficult to satisfy these two conditions simultaneously. One way to solve this problem is to use quasi-phase matching, which introduces wave vector perturbation by periodically poling lithium niobate crystal materials to compensate for the wave vector mismatch between the light participating in the nonlinea...

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Problems solved by technology

However, this method does not guarantee the generation of phase matching points, and even if it does, its tolerance to the working wavelength is very low, and a small wavelength shift will cause a huge change in the phase mismatch, which limits the nonlinear bandwidth in the process

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