Design method and device of waveguide with gradually-changed width and computer storage medium

Abstract

The invention discloses a design method and device of a width gradient waveguide and a computer storage medium. The method comprises the steps of dividing the width gradient waveguide corresponding to the parameter curve into N small sections at equal width intervals, calculating coupling efficiency of each waveguide intrinsic mode between sections of the width gradient waveguide and transmission efficiency of the current width gradient waveguide, and keeping the width intervals of the N small sections unchanged to adjust the shape of the parameter curve, because the waveguide eigenmode between the small segments which spend the most calculation time and the coupling efficiency between the waveguide eigenmodes of the two adjacent small segments are calculated in advance, only the updated length interval of each small segment corresponding to the changed parameter curve needs to be endowed to each small segment to correspond to the calculated waveguide eigenmode, therefore, the transmission efficiency of the width gradient waveguide can be updated. The operation is simple, the calculation speed is high, and the optimization operation of the width gradient waveguide is greatly facilitated.

Description

technical field [0001] The embodiments of the present application relate to but are not limited to the field of optical integrated chips, and in particular, relate to a design method, device and computer storage medium of a waveguide with a tapered width. Background technique [0002] Gradient-width waveguides are commonly used structures in photonic integrated chips. They are widely used in the transition of waveguides with different structures before and after components, and can also be applied in structures such as mode conversion, couplers, and waveguide crossovers. The width of a general tapered waveguide changes linearly, because such a design is the simplest. However, in order to achieve low loss, the length of the linear tapered waveguide is relatively long, and it is difficult to meet the requirements in some applications with strict length restrictions. Therefore, it is necessary to design nonlinear tapered waveguides, such as hyperbolic, elliptical, and fast adia...

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Problems solved by technology

However, in order to achieve low loss, the length of the linear tapered waveguide is relatively long, and it is difficult to meet the requirements in some applications with strict length restrictions. Therefore, it is necessary to design nonlinear tapered waveguides, such as hyperbolic, elliptical, and fast adiabatic Type width changes, etc., but the optimization design of the current nonlinear width gradient waveguide has the problems of difficult optimization and too long design optimization time

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