Electrooptical modulator

An electro-optical modulator and modulation electrode technology, which can be used in instruments, optics, nonlinear optics, etc., and can solve problems such as the decline of extinction ratio.

Inactive Publication Date: 2014-11-05
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Abstract
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Problems solved by technology

However, the power of the light beams transmitted in the two branches of the Y-shaped optical waveguide often has a small difference, resulting in that when the electro-optic modulator is used as a switch, there is still a small power output in the off state, but the output power is not the maximum in the on state, and the extinction ratio ( extinction ratio) decreased

Method used

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  • Electrooptical modulator
  • Electrooptical modulator

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Embodiment Construction

[0020] see figure 1 and figure 2 , the electro-optical modulator 10 of the preferred embodiment of the present invention, which includes a substrate 110, a Y-shaped optical waveguide 120, a first ground electrode 131, a first modulation electrode 132, a second ground electrode 133, a second The modulation electrode 134 , a third ground electrode 135 and a third modulation electrode 136 . The Y-shaped optical waveguide 120 is formed on the base 110 and includes a first branch 121 and a second branch 122 . The first branch 121 includes a first sub-Y-shaped optical waveguide 123, the first sub-Y-shaped optical waveguide 123 includes a first sub-branch 124 and a second sub-branch 125, the second branch 122 includes a second sub-branch The Y-shaped optical waveguide 126 , the second sub-Y-shaped optical waveguide 126 includes a third sub-branch 127 and a fourth sub-branch 128 . The second sub-branch 125 and the fourth sub-branch 128 are respectively located on both sides of the...

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Abstract

The invention provides an electrooptical modulator. The electrooptical modulator comprises a substrate, a Y-shaped optical waveguide, a plurality of modulating electrodes and a plurality of ground electrodes. The Y-shaped optical waveguide is formed on the substrate, and the modulating electrodes and the ground electrodes are arranged on the substrate. The Y-shaped optical waveguide comprises a first branch and a second branch, the first branch comprises a first Y-shaped subsidiary optical waveguide, and the second branch comprises a second Y-shaped subsidiary optical waveguide. The plurality of modulating electrodes and the ground electrodes are used for modulating the first Y-shaped subsidiary optical waveguide and the second Y-shaped subsidiary optical waveguide respectively to enable light beams outputted by the first Y-shaped subsidiary optical waveguide and the second Y-shaped subsidiary optical waveguide to be identical in power, and accordingly extinction ratio can be increased.

Description

technical field [0001] The invention relates to a high-speed optical communication system, in particular to an electro-optic modulator. Background technique [0002] The Mach-Zehner electro-optic modulator uses the electro-optic effect to change the equivalent refractive index of one of the two branches of the Y-shaped optical waveguide by modulating the electric field, thereby changing the phase of the beam transmitted in it, making it consistent with the Y-shaped optical waveguide. There is a phase difference between the beams propagating in the other branch of the waveguide. In this way, the light beams transmitted in the two branches of the Y-shaped optical waveguide will interfere after being recombined, and the output power depends on the phase difference, that is, it is determined by the modulation electric field, so as to realize modulation. However, the power of the light beams transmitted in the two branches of the Y-shaped optical waveguide often has a small diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/035
Inventor 黄新舜
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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