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A tm‑te magneto-optical modulator based on biluig thin films

A magneto-optical modulator, TM-TE technology, applied in instrumentation, optics, nonlinear optics, etc., can solve the problems of DC drift, application limitations of electro-optical modulators, and large optical damage, achieve mode conversion, reduce optical Damage, effect of small light absorption coefficient

Inactive Publication Date: 2018-01-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, electro-optic modulators can be used in optical communication systems, but in recent years, the disadvantages of electro-optic modulation have become more and more obvious, such as short life, large optical damage, and DC drift, which limits the application of electro-optic modulators.

Method used

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  • A tm‑te magneto-optical modulator based on biluig thin films
  • A tm‑te magneto-optical modulator based on biluig thin films
  • A tm‑te magneto-optical modulator based on biluig thin films

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Experimental program
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Embodiment 1

[0020] TM-TE magneto-optical modulator based on BiLuIG thin film, its structure is as follows figure 2 or image 3 shown. figure 2 , image 3 Described is the perspective view of the main parts of the magneto-optical modulator of this embodiment, 1 is an optical fiber, 2 is a polarizer, 3 is a microstrip line, 4 is a polarizer, 5 is a magnet, which is composed of a permanent magnet and a DC coil, 6 Is a permanent magnet (NdFeB), 9 is the base substrate GGG, 10 is a magneto-optical thin film.

[0021] Such as figure 2 , 3 As shown, the light source is a semiconductor laser, and the light is introduced into the magneto-optical unit through the optical fiber 1, and passes through the polarizer 2, the magneto-optic film 10, the analyzer 4 and the photodetector in sequence. The light beam is linearly polarized by the polarizer 4, thereby entering the magneto-optical film; the magneto-optic film is composed of a film with magneto-optic effect, here the BiLuIG single crystal ...

Embodiment 2

[0024] TM-TE magneto-optical modulator based on BiLuIG thin film, its structure is as follows Figure 5 shown. Figure 5 Described is the perspective view of the main parts of the magneto-optic modulator, 1 is the optical fiber, 2 is the polarizer, 3 is the microstrip line, 4 is the analyzer, 7, 8 are the microstrip lines.

[0025] Such as Figure 5 As shown, the light is guided into the magneto-optical unit through the optical fiber 1, and passes through the polarizer 2, the magneto-optic film 10, the analyzer 4 and the photodetector in sequence. The beam is linearly polarized by the polarizer 4 and enters the magneto-optic film; the magneto-optic film is BiLuIG single crystal film made by liquid phase epitaxy; under the action of external magnetic fields Hdc and Hrf, light propagates inside the magneto-optic film During the period, the guided light interacts with the magnetostatic wave, causing the polarization plane of the light to rotate; the light output from the magnet...

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Abstract

The invention provides a TM-TE magneto-optic modulator based on a BiLuIG thin film, which is used to realize the magneto-optic modulation of the ultra-wideband TM-TE and the miniaturization of the modulator. The TM-TE magneto-optical modulator of the present invention is composed of a DC bias magnetic field, a radio frequency modulation magnetic field and a magneto-optical unit, and is characterized in that the magneto-optical unit includes an optical fiber, a polarizer, and a magneto-optical film structure arranged in sequence in the light direction and a polarizer, the magneto-optical thin film structure includes a substrate substrate, a BiLuIG magneto-optic thin film arranged in sequence on the substrate substrate, an RF microstrip line and an insulating layer covered on the microstrip line, wherein the RF microstrip line It is a helical positive and negative winding microstrip line. The radio frequency modulation magnetic field of the present invention is generated by loading a radio frequency signal to the helical forward and reverse winding RF microstrip line, and the design of the helical forward and reverse winding microstrip line can effectively reduce optical damage and reduce the birefringence effect on light inside the magneto-optic film , to maximize the mode conversion of light.

Description

technical field [0001] The invention belongs to the technical field of optical information modulation and optical communication, and relates to a magneto-optical modulator, specifically a TM-TE magneto-optic modulator based on a BiLuIG thin film, utilizing the Faraday effect of the BiLuIG thin film, and under the action of an external magnetic field, Realize the conversion of light mode. Background technique [0002] There are many ways to realize light modulation, the most common is to use electro-optic modulation, such as waveguide modulators made by using crystal electro-optic effect. Nowadays, electro-optic modulators can be used in optical communication systems, but in recent years, the disadvantages of electro-optic modulation have become more and more obvious, such as short life, large optical damage, and DC drift, which limit the application of electro-optic modulators. [0003] In recent years, magneto-optical materials have shown more and more performance advantag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/09
CPCG02F1/09G02F1/092
Inventor 杨青慧田晓洁张怀武饶毅恒文岐业贾利军朱英超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA