Lithium niobate electrooptical modulator

An electro-optical modulator, lithium niobate technology, applied in instruments, optics, nonlinear optics, etc., can solve the problem of large half-wave voltage of the modulator, achieve high-speed modulation, reduce DC half-wave voltage and microwave half-wave voltage , Improve the effect of device integration

Active Publication Date: 2018-10-19
BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above structure makes the ha

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  • Lithium niobate electrooptical modulator
  • Lithium niobate electrooptical modulator

Examples

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Embodiment Construction

[0029] A low half-wave voltage lithium niobate electro-optic modulator, the modulator includes a lithium niobate substrate 1, a waveguide 2, a traveling wave electrode 3 and a matching circuit 5;

[0030] The matching circuit 5 includes a matching electrode 6, a gold wire 7, a load resistor 8 and two capacitors 11;

[0031] The waveguide 2 is located inside the upper surface of the lithium niobate substrate 1;

[0032] The traveling wave electrode 3 is located on the upper surface of the lithium niobate substrate 1;

[0033] The waveguide 2 is located between the traveling wave electrodes 3;

[0034] The waveguide 2 is a Mach-Zehnder interference optical path, located inside the upper surface of the lithium niobate substrate 1;

[0035] The traveling wave electrode 3 is located on the upper surface of the lithium niobate substrate 1, and is a coplanar waveguide structure, consisting of three metal strips, the central metal strip is a signal electrode, and the metal strips on...

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Abstract

The invention relates to a lithium niobate electrooptical modulator, in particular to a low half-wave voltage lithium niobate electrooptical modulator, and belongs to the technical field of lithium niobate electrooptical modulators. According to the lithium niobate electrooptical modulator, a travelling wave electrode and a direct current bias electrode are combined into one, it is achieved that only direct current voltage is loaded on a central electrode of the travelling wave electrode through a capacitor of a match circuit, and carrying out direct current modulation is ensured. In addition,an access high frequency property of the capacitor is utilized, microwave propagation is not influenced, and high speed modulation of the modulator is ensured. The device integration is improved, andunder the circumstances of not changing length of a chip and whole size of the modulator, the electrode length of the chip is greatly increased, therefore direct current half-wave voltage and microwave half-wave voltage of the modulator are greatly reduced.

Description

technical field [0001] The invention relates to a lithium niobate electro-optic modulator, in particular to a low half-wave voltage lithium niobate electro-optic modulator, which belongs to the technical field of lithium niobate electro-optic modulators. The low half-wave voltage refers to the electro-optic modulator described in the present invention The half-wave voltage of the involved lithium niobate electro-optic modulator is lower than that of the lithium niobate electro-optic modulator in the prior art. Background technique [0002] Research on integrated optical devices based on lithium niobate materials, such as integrated optical electro-optic modulators, optical switches, electric field sensors, and magnetic field sensors, has attracted the attention of many researchers. High-speed lithium niobate electro-optic modulator has the advantages of wide spectral working range, low driving voltage, small insertion loss, high extinction ratio, zero or adjustable chirp, hi...

Claims

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Application Information

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IPC IPC(8): G02F1/03G02F1/035
CPCG02F1/0316G02F1/0327G02F1/035
Inventor 周建伟夏君磊郑国康刘瑞丹乔建坤宁智超徐玉亮
Owner BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
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