Electro-optical modulator

Abstract

The invention discloses an electro-optical modulator, and relates to the technical field of optical communication devices. The electro-optical modulator sequentially comprises a base layer, a substrate layer, an integrated waveguide and a covering layer from bottom to top, and metal electrodes are arranged on two sides of the covering layer; meanwhile, the integrated waveguide comprises a lithiumniobate waveguide and a conducting layer, the lithium niobate waveguide is located on the substrate layer, the conducting layer is located between the covering layer and the lithium niobate waveguide,the conducting layer is located between the two metal electrodes, and a certain distance is kept between the conducting layer and the two metal electrodes. The electro-optical modulator provided by the invention has the advantages of small structural size, high modulation bandwidth, high adjustment efficiency and no influence of pyroelectric effect on the working state and the adjustment efficiency.

Description

technical field [0001] The invention relates to the technical field of optical communication devices, in particular to an electro-optical modulator. Background technique [0002] Due to the excellent performance of lithium niobate material, it has the advantages of high electro-optic response, high intrinsic bandwidth, wide transparent window (0.35um-5um) and good thermal stability, so lithium niobate material has been widely researched and applied in electro-optic modulators. . Especially with the rapid development of thin-film lithium niobate in recent years and the solution of the lithium niobate waveguide etching problem, thin-film lithium niobate modulators have been extensively studied. Compared with traditional lithium niobate modulators, thin film lithium niobate modulators have the advantages of high modulation bandwidth, small structure size and high regulation efficiency. [0003] However, due to the characteristics of lithium niobate materials, pyroelectric phe...

AI Technical Summary

Problems solved by technology

[0003]However, due to the characteristics of lithium niobate materials, both traditional lithium niobate modulators and thin-film lithium niobate modulators have pyroelectric phenomena, and That is to say, as the temperature changes, there is charge accumulation on the surface of the lithium niobate material, which will cause an electric field generated by the accumulated charge to be superimposed on both sides of the lithium niobate waveguide, thereby changing the modulation efficiency of the lithium niobate modulator.

The final result is: on the one hand, the working state of the lithium niobate modulator will change in real time; on the other hand, the extinction ratio of the output signal of the lithium niobate modulator will also change with time

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