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Multi-wavelength tunable narrow-band filter based on lithium niobate crystal

A narrow-band filter and filter technology, applied in instruments, nonlinear optics, optics, etc., to achieve wide application prospects, simple tuning method, and fast tuning speed

Inactive Publication Date: 2017-05-10
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention can realize multi-wavelength tunable filtering and the number of filtering wavelengths can be adjusted

Method used

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  • Multi-wavelength tunable narrow-band filter based on lithium niobate crystal
  • Multi-wavelength tunable narrow-band filter based on lithium niobate crystal
  • Multi-wavelength tunable narrow-band filter based on lithium niobate crystal

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Experimental program
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Effect test

Embodiment 1

[0032] figure 1 As shown in the filter structure, the filter uses lithium niobate crystal as a substrate 1, a Bragg waveguide grating structure 3 and a grating-free waveguide structure are cross-prepared on the substrate, and electrodes 2 are prepared on both sides of the grating-free waveguide 4, forming a multiple Wavelength tunable narrowband filter structure. The periods of all Bragg waveguide grating segments are consistent, and the period size satisfies λ=2nΛ, where λ is the filtering center wavelength of the filter, Λ is the period of the Bragg grating, and n is the effective refractive index of the waveguide grating.

[0033] Adjust the voltage applied to the electrodes, and only retain the phase shift caused by the three pairs of electrode structures All remaining electric fields are adjusted to cause a phase shift by the amount k=1,2,3..., these points are equivalent to no phase shift points, forming a three-wavelength tunable narrowband filter structure, and its...

Embodiment 2

[0045] On the basis of Example 1, when the filter is equivalent to comprising 6 segments of Bragg waveguide gratings and 5 pairs of electrodes, the lengths of the grating segments are 9mm, 3mm, 3mm, 3mm, 3mm, 9mm, and the electrode lengths are 725.2um. When the electrode spacing is 10um, the voltage is applied to 5 pairs of electrodes at the same time to cause When the phase is shifted, its transmission spectrum is as Figure 6 shown. Simultaneously applying voltage to 5 pairs of electrodes causes When the phase is shifted, its transmission spectrum is as Figure 7 shown. Simultaneously applying voltage to 5 pairs of electrodes causes When the phase is shifted, its transmission spectrum is as Figure 8 shown. It can be seen that changing the voltage on the electrodes causes the wavelength of the transmitted wave to change, realizing the tuning and filtering function of the five-wavelength filter.

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Abstract

Provided is a multi-wavelength tunable narrow-band filter based on a lithium niobate crystal. A multi-wavelength tunable narrow-band filter structure is formed by taking the lithium niobate crystal as substrate, Bragg waveguide gratings and no-raster waveguiding structures are prepared in a crossed mode in the x or y or z diction of the lithium niobate crystal, electrode structures are prepared on the two sides of no-raster waveguiding, and the filter structure is as shown in figure 1. The filter achieves the multi-wavelength tunable filtering function by means of the electro-optic effect of the lithium niobate crystal. The multi-wavelength tunable narrow-band filter has the advantages that multi-wavelength tunable filtering can be achieved by changing voltage applied to the electrode; the filter can achieve selection of the number of wave lengths obtained through filtration of the filter by selecting the number of voltage applied electrodes; by means of the electro-optic characteristic of the lithium niobate crystal, tuning speed is high, and the multi-wavelength tunable narrow-band filter has a wide application prospect.

Description

[0001] Technical field: [0002] The invention relates to an optical filter, in particular to a multi-wavelength tunable filter based on lithium niobate crystal. [0003] Background technique: [0004] Using fiber grating or waveguide grating as a basic wavelength selective component has a very wide range of applications in the fields of optical communication and optical sensing. According to the size of the grating period, it can be divided into long-period gratings with a period length of 100um and Bragg gratings with a period size of less than 1um. The short-period Bragg gratings can greatly reflect specific wavelengths that meet the Bragg conditions. It has the function of narrow-band filtering. [0005] Since the fiber grating is limited by the fiber material (quartz glass) and structure (cylindrical cladding structure), it can only achieve slow tuning based on the elasto-optic effect (stress) and thermo-optic effect (temperature) (tuning rate is generally on the order of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/035
CPCG02F1/035
Inventor 张爱玲姚远
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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