Electro-optical polarization rotator based on periodically polarized lithium niobate ridge waveguide structure

Abstract

The invention discloses an electro-optical polarization rotator which comprises a silicon dioxide layer, a lithium niobate crystal film layer and an insulating medium protection layer sequentially arranged on a lithium niobate substrate, wherein a periodic lithium niobate ridge waveguide, a scribed groove and an embedded electrode arranged in the scribed groove are arranged in the lithium niobate crystal film layer; the polarized rotation of input light in the lithium niobate ridge waveguide is realized by applying an electric field in a lateral direction of the lithium niobate ridge waveguide through a transverse electro-optic effect. The electro-optical polarization rotator provided by the invention utilizes a periodically polarized lithium niobate ridge waveguide structure to have advantages of electro-optic control, small volume, low driving voltage, fast response, high polarization precision, integratability, high damage threshold and the like.

Description

technical field [0001] The invention relates to a technology in the fields of optoelectronics and optical communication, in particular to an electro-optical polarization rotator based on a periodically polarized lithium niobate ridge waveguide structure. Background technique [0002] At present, the control of light polarization mainly includes mechanical, liquid crystal, and electro-optic modulation. Mechanical polarization controllers such as spatial wave plate rotators, extruded fiber optic polarization controllers, etc. The wave plate rotator is based on the natural birefringence characteristics of the wave plate itself, and the direction of the main axis of the wave plate is rotated manually or electronically, so as to achieve the purpose of polarization control; and the stress birefringence generated by squeezing the optical fiber is used to change the polarization state. Relatively simple, but the polarization state cannot be precisely controlled. Liquid crystal pol...

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Problems solved by technology

[0003] Aiming at the defects of the existing diffusion waveguide, such as small refractive index contrast, weak light field localization, low damage threshold of the diffusion waveguide, and easy damage under high power input, the present invention proposes a periodic polarization based The electro-optic polarization rotator with lithium niobate ridge waveguide structure is based on the transverse electro-optic effect. By applying a transverse electric field on both sides of the periodically polarized lithium niobate ridge waveguide, it forms a swing domain structure of Solc filter configuration.

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