Electro-optical modulator

Abstract

The invention relates to an electro-optical modulator which comprises a base, a ridge-shaped optical waveguide structure, a first ground electrode, a first modulation electrode, a second ground electrode and a second modulation electrode. The ridge-shaped optical waveguide structure is located at the top surface of the base and comprises a ridge-shaped structure and an optical waveguide formed in the ridge-shaped structure; the ridge-shaped structure comprises a Y-shaped fork part; the fork part comprises a first branch and a second branch; the first branch comprises a first sub-Y-shaped optical waveguide and comprises a first sub-branch and a second sub-branch; the second branch comprises a second sub-Y-shaped optical waveguide and comprises a third sub-branch and a fourth sub-branch; both the first ground electrode and the first modulation electrode are used for modulating the first sub-Y-shaped optical waveguide; both the second ground electrode and the second modulation electrode are used for modulating the second sub-Y-shaped optical waveguide. Therefore, the first sub-Y-shaped optical waveguide and the second sub-Y-shaped optical waveguide output the same power, and the extinction ratio is accordingly improved.

Description

technical field [0001] The invention relates to integrated optics, 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, there is often a slight difference in the power of the beams transmitted in the two branches of the Y-shaped planar optical waveguide, result...

AI Technical Summary

Problems solved by technology

However, there is often a slight difference in the power of the beams transmitted in the two branches of the Y-shaped planar optical waveguide, 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) down

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