A mode high-efficiency coupler and its preparation method

Abstract

A mode high-efficiency coupler disclosed by the present invention includes a first waveguide, a micro-nano transition structure, and a second waveguide; the second waveguide can customize several cross-sectional shapes, and the first waveguide is coupled to the first end of the micro-nano transition structure , the second waveguide is coupled to the second end of the micro-nano transition structure, and the sequentially connected first waveguide, micro-nano transition structure, and second waveguide are packaged in a container; the invention sets a composite transition with a specific shape and a micro-nano scale structure, and the laser three-dimensional direct writing system is used for high-precision preparation to realize the efficient conversion of optical field modes between waveguides of different sizes, that is, to achieve two-way efficient coupling between single-mode fibers and micro-nano waveguides, which overcomes the high precision of traditional coupling methods. Alignment, high cost, and technical issues that are not easy to integrate.

Description

technical field [0001] The invention relates to the research field of optical fiber communication, in particular to a mode high-efficiency coupler and a preparation method thereof. Background technique [0002] In many applications, such as optical interconnection, nonlinear optical signal processing, and quantum integrated optics, achieving low-loss coupling between different optical waveguides is crucial for efficient transmission of optical signals. This low-loss optical coupling is the key to realize the seamless connection between photonic integrated structures, especially the optical coupling between optical fiber and integrated waveguide in photonic integrated circuits. The corresponding mechanisms and techniques for efficient coupling of light field modes have been fully studied and successfully implemented. [0003] At present, the coupling methods of light field modes are mainly end-to-end coupling, diffraction grating coupling and micro-nano fiber evanescent fiel...

AI Technical Summary

Problems solved by technology

Traditional coupling methods, such as end-to-end coupling and lens coupling, have problems such as high-precision alignment, high cost, small working bandwidth, and difficulty in integration, making it difficult to promote and realize free regulation

In addition, the inherent requirement of "adiabatic conditions" in the mode ramping process of traditional coupling methods limits the miniaturization and integration of composite structures using these coupling methods. Therefore, a flexible and scalable New coupling method to realize seamless connection between different waveguides

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