Multi-mode interference coupling structure dual-mode cross waveguide based on LNOI material

By setting width-optimized waveguides and self-imaging areas in the multi-mode interference coupled structure of LNOI material, combined with the particle swarm algorithm to optimize the structure, the problems of traditional waveguides with large size, complex structure and insufficient performance in suppressing crosstalk are solved, and high-efficiency and low-loss optical wave transmission is achieved.

CN119717133AActive Publication Date: 2025-03-28HENAN NORMAL UNIV
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Patent Information

Application Number
CN202510044755.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-13
Publication Date
2025-03-28
Estimated Expiration
2045-01-13

AI Technical Summary

Technical Problem

The traditional multi-mode interference coupled structure dual-mode cross-waveguide has problems such as large size, complex structure, poor versatility, low integration and insufficient crosstalk suppression performance.

Method used

A multi-mode interference coupled structure dual-mode cross waveguide based on LNOI material is adopted. By setting a rectangular self-imaging area and four width optimization waveguides in the lithium niobate waveguide, and combining with the particle swarm algorithm to optimize the width change points, a width optimization waveguide with isosceles trapezoid cross-section is formed.

Benefits of technology

The simultaneous propagation of TE0 and TE1 mode light is realized, greatly reducing crosstalk and loss. It has a simple structure and stable structure, small size and easy to integrate. The transmission efficiency is no less than 88%, and the crosstalk is less than -30dB.

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Abstract

The invention provides an LNOI material-based multimode interference coupling structure dual-mode cross waveguide, which comprises a silicon dioxide substrate, a lithium niobate waveguide and a silicon dioxide cladding, and is characterized in that the lithium niobate waveguide is located on the silicon dioxide substrate, and the silicon dioxide cladding covers the lithium niobate waveguide and the silicon dioxide substrate; the lithium niobate waveguide comprises a rectangular self-imaging area and four width optimization waveguides arranged around the self-imaging area, and the four width optimization waveguides are distributed in a circular array with the center point of the self-imaging area as the circle center and coincide with the four side faces of the self-imaging area respectively and are connected with the four side faces of the self-imaging area. The outer end of the width optimization waveguide is connected with an output waveguide or an input waveguide; according to the invention, light in TE0 and TE1 modes is supported to propagate at the same time, and the mutual influence is extremely small; the LNOI material is adopted, and compared with a silicon material, the lithium niobate material has the advantages of being wide in transparent wave band, low in absorption loss, high in optical damage resistance threshold value and the like.
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