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A Topologically Protected Mach-Zehnder Interferometer

A topology protection, interferometer technology, applied in instruments, light guides, optics, etc., to achieve the effect of satisfying integration, small structure size, and ensuring stability

Active Publication Date: 2022-06-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is an urgent need to design robust photonic crystal waveguides that are free from the challenges of device reliability caused by manufacturing defects.

Method used

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  • A Topologically Protected Mach-Zehnder Interferometer
  • A Topologically Protected Mach-Zehnder Interferometer
  • A Topologically Protected Mach-Zehnder Interferometer

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Embodiment Construction

[0021] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments.

[0022] like figure 1 As shown, the TPMZI described in the present invention is integrated by two-dimensional topological photonic crystal waveguides, including beam splitting waveguide SP1, multiplexing waveguide SP2, input and output waveguides, interference arm waveguide, reference arm waveguide and intermediate interface waveguide. The lengths of the input and output coupling waveguides are both 36a, the waveguide lengths of the interference arm and the reference arm are both 34a, and the beam splitting and combining distances of the splitting and combining waveguides are both 17a.

[0023] The beam-splitting waveguide and the wave-combining waveguide are Y-shaped structures, and the beam-splitting and combining angles are 120°.

[0024] like figure 2 As shown in (a), the two-dimensional topological phot...

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Abstract

The present invention provides a topologically protected Mach-Zehnder interferometer. The interferometer is integrated with two-dimensional topological photonic crystal waveguides, including two valley photonic crystals with different topological indices. The Mach-Zehnder interferometer has the characteristics of unidirectional transmission, immune backscattering, immune defect, and compatibility with a variety of substrate materials. It is efficient and robust, and can avoid fabrication while maintaining high efficiency output Interference caused by defects, stable work. It provides an efficient and stable implementation method of photonic crystal MZI for future all-optical networks, biosensing, and spectral analysis.

Description

technical field [0001] The invention relates to the technical field of photonic crystals, in particular to a Mach-Zehnder interferometer with topological boundary states. Background technique [0002] Mach-Zehnder interferometer (MZI), as one of the most widely used optical components, is used to measure relative physical properties (refractive index or density, etc.) due to its high sensitivity to the surrounding medium. A common means of variation. It has been widely used to realize various photonic devices, such as optical switches, filters, intensity modulators, refractive index detectors, displacement measurers, etc. [0003] Conventional silicon-based MZIs using standard waveguides are a relatively mature technology, but such MZIs have relatively low perturbation changes in propagation constants, Δβ. Because the relationship between the phase change and the propagation constant change Δβ and the waveguide length L satisfies: Δφ=Δβ×L, the length of the waveguide needs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/125G02B6/122G02B6/293
CPCG02B6/125G02B6/1225G02B6/1228G02B6/29346
Inventor 郭小伟杨沛霖蒋鹏鹏李绍荣杨承
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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