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Polarization control device and method based on film lithium niobate

A polarization control, lithium niobate technology, applied in the field of optical communication, can solve the problems of high driving voltage, limited application, bulky volume, etc., and achieve the effect of low driving voltage, low optical loss, and fast polarization tracking

Pending Publication Date: 2022-05-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing lithium niobate polarization control devices are still bulky in size (greater than 5 cm), and the driving voltage is also high (over 100 V), such as polarization controllers based on titanium-diffused lithium niobate, which severely limit their performance in communication and sensing applications

Method used

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  • Polarization control device and method based on film lithium niobate
  • Polarization control device and method based on film lithium niobate
  • Polarization control device and method based on film lithium niobate

Examples

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Embodiment 1

[0035] This embodiment proposes a polarization control device based on thin-film lithium niobate, such as figure 1 As shown, a schematic structural diagram of the polarization control device based on thin-film lithium niobate of the present embodiment.

[0036] The polarization control device based on thin-film lithium niobate proposed in this embodiment includes a first optical coupler 2 , a first polarization beam splitter rotator 3 , a polarization measurement component 4 , and a 2×2 device arranged on the lithium niobate film 1 . Mach-Zehnder interferometer 5 , polarization control system 6 and lithium niobate optical waveguide 7 .

[0037] The first optical coupler 2 in this embodiment is a polarization-independent end-face coupler, which is used to couple any input polarized light into the lithium niobate optical waveguide 7 for transmission.

[0038] The first polarization beam splitter rotator 3 in this embodiment is used to convert any input polarized light into TE p...

Embodiment 2

[0048] This embodiment makes improvements on the basis of a polarization control device based on thin-film lithium niobate proposed in Example 1.

[0049] The polarization control device based on thin-film lithium niobate proposed in this embodiment includes a first optical coupler 2 , a first polarization beam splitter rotator 3 , a polarization measurement component 4 , and a 2×2 device arranged on the lithium niobate film 1 . Mach-Zehnder interferometer 5 , polarization control system 6 and lithium niobate optical waveguide 7 .

[0050] Further, the polarization measurement component 4 in this embodiment includes a first beam splitter 401 for detecting the energy of the TE polarized light in the lithium niobate waveguide, and a first photodetector 402 for monitoring the polarization state of the TE polarized light, and a 2×2 multi-mode interferometer 403; wherein, the first photodetector 402 is flip-chip welded above the output grating of the first beam splitter 401, or, th...

Embodiment 3

[0059] This embodiment makes improvements on the basis of the polarization control device based on thin-film lithium niobate proposed in embodiment 1 or 2.

[0060] The polarization control device based on thin-film lithium niobate proposed in this embodiment includes a first optical coupler 2 , a first polarization beam splitter rotator 3 , a polarization measurement component 4 , and a 2×2 device arranged on the lithium niobate film 1 . Mach-Zehnder interferometer 5 , polarization control system 6 and lithium niobate optical waveguide 7 .

[0061] Metal electrodes 8 are respectively disposed between the phase-shifting arms of the 2×2 Mach-Zehnder interferometer 5 in this embodiment and on both sides of the phase-shifting arms, and the metal electrodes 8 are connected to the polarization control system 6 through metal leads. . The polarization control system 6 controls the voltage of the metal electrode 8 through the metal lead, so as to control the distribution of the trans...

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Abstract

The invention relates to the technical field of optical communication, and provides a polarization control device and method based on film lithium niobate, and the device comprises a first optical coupler, a first polarization beam splitting rotator, a polarization measurement part, a 2 * 2 Mach-Zehnder interferometer, a polarization control system and a lithium niobate optical waveguide which are arranged on a lithium niobate film. Any input polarized light enters the lithium niobate optical waveguide through the first optical coupler and then is converted into TE polarized light through the first polarization beam splitting rotator. The polarization measurement part is used for detecting energy of the TE polarized light and transmitting a detection result to the polarization control system; the polarization control system calculates the polarization state of the input polarized light and a transmission matrix between the input polarized light and the target output polarized light according to the detection result of the polarization measurement component, calculates a voltage control value according to the transmission matrix, and applies a corresponding voltage to the 2 * 2 Mach-Zehnder interferometer, so that the target output polarized light is obtained. Polarization control is realized by controlling distribution of TE polarized light on two arms of the 2 * 2 Mach-Zehnder interferometer.

Description

technical field [0001] The present invention relates to the technical field of optical communication, and more particularly, to a polarization control device and method based on thin-film lithium niobate. Background technique [0002] The polarization state is one of the basic properties of light and plays an extremely important role in optical communication systems. For example, the use of polarization multiplexing technology can effectively improve the transmission capacity. In coherent optical communication systems, complex digital signal processing is usually required to compensate for the rapid changes in the polarization state in the fiber. In the future ultra-high-speed data transmission system, it will be a difficult problem to only rely on digital signal processing to perform polarization state compensation. And a high-performance automatic polarization control device with infinite polarization state conversion range can track and stabilize the polarization state ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/03G02F1/035G02F1/01
CPCG02F1/0305G02F1/0353G02F1/0142
Inventor 蔡鑫伦林艳梅
Owner SUN YAT SEN UNIV
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