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An electro-optic polarization modulator based on lithium niobate y-waveguide integrated optics

An electro-optic polarization modulation and waveguide integration technology, which is applied in the fields of optoelectronic technology and optical communication, can solve the problems of inability to realize polarization modulation, insufficient long-term stability, and low polarization extinction ratio, and achieve good response characteristics, low insertion loss, and high polarization extinction. the effect of

Active Publication Date: 2022-03-08
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention addresses the above-mentioned problems, such as the low polarization extinction ratio and insufficient long-term stability of the existing titanium-diffused lithium niobate polarization modulator, and the proton-exchange lithium niobate electro-optic modulator can only realize phase regulation, but cannot realize polarization Modulation and other defects, propose an electro-optic polarization modulator based on proton-exchanged lithium niobate Y-waveguide integrated optical device

Method used

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  • An electro-optic polarization modulator based on lithium niobate y-waveguide integrated optics
  • An electro-optic polarization modulator based on lithium niobate y-waveguide integrated optics
  • An electro-optic polarization modulator based on lithium niobate y-waveguide integrated optics

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Embodiment 1

[0032] Such as figure 1 , figure 2 with image 3 As shown, this embodiment mainly includes a proton-exchanged lithium niobate Y-waveguide integrated optical device and a fiber polarization beam combiner 4 , and the two optical devices are connected through a flange 3 . The lithium niobate Y-waveguide integrated optical device includes: a polarization-maintaining optical fiber 1 and a lithium niobate crystal 2 . Wherein, the lithium niobate crystal 2 includes: a lithium niobate Y waveguide 21 , a push-pull modulation metal electrode 22 and an insulating dielectric protection layer 24 sequentially arranged on the lithium niobate crystal layer 23 . The fused fiber-based polarization beam combiner 4 includes: a polarization-maintaining fiber 41 traveling along the slow axis, a polarization-maintaining fiber 42 and a polarization-maintaining fiber 43 traveling along the fast axis.

[0033] Such as figure 2 As shown, the lithium niobate crystal 2 is 23 mm long and 2.8 mm wide....

Embodiment 2

[0043] The proposed scheme is not limited to the fiber-based polarization beam combiner described in Example 1, but can also be implemented in a birefringent crystal polarization beam combiner. After the beams are combined by the birefringent crystal, the output light can be spatial light, or it can be coupled into the optical fiber again.

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Abstract

The invention discloses an electro-optical polarization modulator based on a proton-exchanged lithium niobate Y-waveguide integrated optical device, relates to the field of optoelectronic technology and optical communication, and includes a proton-exchanged lithium niobate Y-waveguide integrated optical device and a fiber optic polarization beam combiner , the proton-exchanged lithium niobate Y-waveguide integrated optical device includes a first polarization-maintaining fiber and a lithium niobate crystal, and the fiber polarization beam combiner includes a second polarization-maintaining fiber, a third polarization-maintaining fiber and a fourth polarization-maintaining fiber Polarized optical fiber; the lithium niobate crystal includes a lithium niobate crystal layer, a lithium niobate Y waveguide, a metal electrode and an insulating medium protection layer, and the Y waveguide is placed in the lithium niobate crystal layer, and the Y waveguide Both sides of the branch cover the metal electrode, and the insulating dielectric protection layer is fully distributed around the lithium niobate Y waveguide and the metal electrode. The invention utilizes the electro-optical effect to realize the modulation of the polarization state of the light by the electric signal, and is convenient for loading the electric signal into the specified polarization state of the light for polarization encoding.

Description

technical field [0001] The invention relates to the fields of optoelectronic technology and optical communication, in particular to an electro-optical polarization modulator based on a lithium niobate Y waveguide integrated optical device. Background technique [0002] With the rapid development of optical communication, polarization coding has received great attention due to its power balance and good polarization stability. Polarization encoding realizes information loading by modulating the polarization state of light, so polarization modulators are particularly important in polarization encoding. At present, polarization modulation mainly relies on acousto-optic, electro-optic, and magneto-optical effects. Among them, polarization modulators based on electro-optic effects have outstanding advantages such as fast modulation speed and high control precision, so they have been rapidly developed and widely used. [0003] The electro-optic effect refers to the phenomenon tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01G02F1/03
CPCG02F1/0136G02F1/0305G02F1/0311
Inventor 卢川艺郑远林陈险峰
Owner SHANGHAI JIAOTONG UNIV