Method for modulating light by free space coupling technology and modulator

A free-space, modulated light technology, used in instruments, optics, nonlinear optics, etc., can solve the problems of large-scale integration of devices, high modulation voltage, and limited large-scale integration, and achieve improved integration. , volume reduction, high sensitivity effect

Inactive Publication Date: 2007-01-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two kinds of attenuated total reflection electro-optic modulators have shortcomings. The former has two shortcomings: 1) it requires a higher modulation voltage; 2) the use of prism coupling limits its large-scale integration
Although the latter reduces the modulation voltage, it still does not solve the problem of large-scale integration of devices due to the use of prism coupling.

Method used

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  • Method for modulating light by free space coupling technology and modulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A reflective organic polymer electro-optic modulator based on free-space coupling technology is used to modulate the S-polarized laser signal with a wavelength of 832nm.

[0021] Step 1: Select K9 glass as the substrate glass, place it in acetone solution, clean it with ultrasonic waves, then clean it with deionized water and put it in an oven for drying. The lower metal film 3 is made of gold (ε=-25.2+1.6i), which is plated on the upper surface of K9 glass by sputtering, with a thickness of 300nm. The organic polymer film 2 is made of polyimide with a refractive index of 1.56, which is plated on the underlying gold film with a thickness of about 15 μm by a spin film forming method. Then, near the glass transition temperature (110°C) of the material of the organic polymer film 2, a very high DC voltage (3000V) is applied to the metal needle tip perpendicular to the surface of the organic polymer, and the poles inside the organic polymer film Sex molecules will be neatl...

Embodiment 2

[0024] The modulation of the P-polarized laser signal with a wavelength of 832nm is realized by using a reflective organic polymer electro-optic modulator based on free space coupling technology.

[0025] Step 1: Select K9 glass as the substrate glass, place it in acetone solution, clean it with ultrasonic waves, then clean it with deionized water and put it in an oven for drying. The lower metal film 3 is made of gold (ε=-25.2+1.6i), which is plated on the upper surface of K9 glass by sputtering, with a thickness of 300nm. The organic polymer film 2 is made of polyimide with a refractive index of 1.56, which is plated on the underlying gold film with a thickness of about 30 μm by a spin film forming method. Then, near the glass transition temperature (170°C) of the material of the organic polymer film 2, a very high DC voltage (3000V) is applied to the metal needle tip perpendicular to the surface of the organic polymer, and the poles inside the organic polymer film Sex mole...

Embodiment 3

[0028] A reflective organic polymer electro-optic modulator based on free-space coupling technology is used to modulate the S-polarized laser signal with a wavelength of 832nm.

[0029] Step 1: Select K9 glass as the substrate glass, place it in acetone solution, clean it with ultrasonic waves, then clean it with deionized water and put it in an oven for drying. The lower metal film 3 is made of gold (ε=-25.2+1.6i), which is plated on the upper surface of K9 glass by sputtering, with a thickness of 300nm. The organic polymer film 2 is made of polyimide with a refractive index of 1.56, which is plated on the underlying gold film with a thickness of about 20 μm by a spin film forming method. Then, near the glass transition temperature (110°C) of the material of the organic polymer film 2, a very high DC voltage (3000V) is applied to the metal needle tip perpendicular to the surface of the organic polymer, and the poles inside the organic polymer film Sex molecules will be neatl...

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Abstract

Lower layer of metal film, organic polymer film, and upper layer of metal film of modulator are plated on up surface of substrate. Lower and upper films and polymer film constitute double-sided metal cladding waveguide structure. The upper layer film and polymer film constitute structure of attenuated total reflectance. The method includes steps: preparing modulator; using laser signal irradiates up surface of the upper layer film directly; when incident angle reaches mode-matching angle, guided wave resonance occurs so as to excitate guided wave traveled inside polymer film; drawing curve between reflected light intensity and varying angle; selecting mode-matching angle of producing guided wave resonance as working point of modulator; applying electric signal to lower and upper films to modulate incident laser signal; detecting reflected laser signal, and displaying the signal on oscilloscope. Features are: low voltage, cost, insertion loss and easy of integration.

Description

technical field [0001] The invention relates to a method and a modulator, in particular to a method and a modulator for modulating light using free space coupling technology. It belongs to the field of optoelectronic communication and optical information processing. Background technique [0002] According to the working principle, the optical modulator can be divided into magneto-optic type, acousto-optic type, electro-absorption type and electro-optic type. Among them, the electro-optic modulator is the most studied type of optical modulator. It is a type of device that uses the characteristics of electro-optic materials to change the refractive index of electro-optic materials under the action of an external electric field to achieve modulation of the transmitted beam. According to the structure of the electro-optic modulator, it can be further divided into a bulk electro-optic modulator, a waveguide transmission electro-optic modulator and a reflective electro-optic mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/061
Inventor 朱琨邓晓旭曹庄琪沈启舜
Owner SHANGHAI JIAO TONG UNIV
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