Method for designing fully randomized silicon-based waveguide optical grating on basis of chaotic particle swarm optimization algorithm

Abstract

The invention relates to a method for designing a fully randomized silicon-based waveguide optical grating on the basis of a chaotic particle swarm optimization algorithm. Uniform optical grating design parameters are made inhomogeneous, the overall variation of the optical grating is designed as the change of each periodic block, and a coupling efficiency value under the case of each parameter isan adaptation degree in the particle swarm optimization algorithm; when a particle swarm evolves to the next generation, each particle updates itself by tracking two optimal solutions including pbestand gbest; when a boundary position value is taken as a particle value, chaotic variable processing is conducted, and a global search function is achieved; an initial value is provided for a chaoticvariable, and a group of random sequences with ergodicity and pseudo-randomness are generated through iteration of a chaotic iterative equation; a coupling efficiency standard required for the opticalgrating is set, when a particle swarm optimization result reaches the required standard, the process stops automatically, and the particle value corresponding to the adaptation degree is the demandeddesign parameter value. Systematic design of the fully randomized optical grating is achieved, and design parameters and the coupling efficiency of the optical grating can be effectively and quicklyobtained.

Description

technical field [0001] The invention relates to a design method for a silicon-based waveguide grating coupling device, belonging to the technical field of photonic devices. Background technique [0002] Integrated optical components integrate conventional discrete optical components with various functions onto the surface of the same optical substrate, and have the same function as a large optical system composed of multiple discrete optical components to process optical signals. Compared with conventional optical components, integrated optical components have the advantages of small size, light weight, low power consumption, high reliability, and long life. At present, integrated optical components have played a very important role in communication, military, electric power, astronomy, sensing and other application fields. Especially in the application in the military field, it has the incomparable superiority of the conventional optical system. [0003] Optical waveguide...

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Problems solved by technology

[0005] The design parameters of the grating directly affect the coupling performance of the grating involved. For a grating coupler with a general uniform structure, there are fewer design parameters, which also leads to a low coupling efficiency, usually not more than 30%, but for a grating with a non-uniform structure Coupler, there are too many design parameters, it is difficult for designers to control, and the manufacturing process of silicon-based devices is complicated, if the design effect is not ideal, it will increase a lot of production costs

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