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A tunable optical filter based on lithium niobate and its application

An optical filter, lithium niobate technology, applied in instruments, optics, nonlinear optics, etc., can solve the problems of unfavorable devices such as polarization insensitivity, expand the tunable ability, overcome the polarization insensitivity characteristics, which are not conducive to realization, zero sensitivity, etc. The effect of power consumption

Inactive Publication Date: 2018-08-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problem of birefringence in lithium niobate, which is not conducive to realizing the polarization-insensitive characteristics of the device, it is impossible to apply lithium niobate to arrayed waveguide gratings in the prior art

Method used

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  • A tunable optical filter based on lithium niobate and its application
  • A tunable optical filter based on lithium niobate and its application
  • A tunable optical filter based on lithium niobate and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0040] like Figure 1-3 shown.

[0041] A tunable optical filter based on lithium niobate, comprising an upper confinement layer 1, a lithium niobate waveguide layer 2 and a lower confinement layer 3 stacked in sequence from top to bottom; the upper surface of the upper confinement layer 1 is provided with an upper electrode 4. The lower surface of the lower confinement layer 3 is provided with a lower electrode 6; the lithium niobate waveguide layer 2 is a lithium niobate thin film provided with an arrayed waveguide grating on the upper surface; the upper electrode 4 includes even-numbered waveguide electrodes inserted into each other 10 and odd-numbered waveguide electrodes 9; the even-numbered waveguide electrodes 10 are provided with two even-numbered slots 7; the odd-numbered waveguide electrodes 9 are provided with three odd-numbered slots 8, and the even-numbered slots 7 and odd-numbered slots 8 are arranged alternately; the even-numbered slots The lengths of 7 and odd...

Embodiment 2

[0045] The difference of the tunable optical filter based on lithium niobate as described in Embodiment 1 is that the upper confinement layer and the lower confinement layer are respectively an upper confinement layer of silicon dioxide and a lower confinement layer of silicon dioxide.

Embodiment 3

[0047] A method for tuning using the lithium niobate-based tunable optical filter described in embodiment 1-2, comprising the following steps:

[0048] 1) Center wavelength tuning mode:

[0049] Simultaneously load the in-phase voltage with the same voltage value on the odd-numbered waveguide electrodes 9 and the even-numbered waveguide electrodes 10, so that the phase difference of the light wave in the adjacent waveguide changes, and then changes the position where the diffraction maximum value of each wavelength in the output waveguide appears; in this working mode Odd-numbered waveguide electrodes 9 and even-numbered waveguide electrodes 10 can be regarded as indifferent electrodes;

[0050] Applying voltage to the electrode will change the refractive index, that is, change the optical path difference. From the output result, the central wavelength of the filter output will change; the position where the diffraction maximum appears is equivalent to the central wavelength o...

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Abstract

The invention relates to a lithium niobate based tunable optical filter and application thereof. According to the lithium niobate based tunable optical filter, the characteristic of a lithium niobate crystal is skillfully utilized, and the refractive index is changed based on the electro-optical effect, so that the optical path difference between adjacent waveguides can be dynamically adjusted and the tunable range of the device is changed; and besides, based on the electro-optical effect, appropriate voltage is applied to an electrode to change the refractive index of the crystal so as to change an optical path, that is, the phase difference of the light having different wavelengths in adjacent waveguides is changed, and after the light is subjected to waveguide output through an output channel, demultiplexing to different wavelengths of the light is finished, and the tunability of an arrayed waveguide grating is expanded.

Description

technical field [0001] The invention relates to a tunable optical filter based on lithium niobate and an application thereof, belonging to the technical field of optical filters. Background technique [0002] Arrayed waveguide gratings have all the advantages of planar optical waveguide devices. After more than 20 years of development, the performance of arrayed waveguide gratings has been continuously improved and perfected day by day. In recent years, with the rapid advancement of fiber-to-the-home optical networks, the application of arrayed waveguide gratings in wavelength division multiplexing passive optical networks (WDM-PON) has become increasingly important, but the tunable capabilities of waveguide arrayed gratings as switching devices are still to be determined. develop. [0003] Arrayed waveguide gratings in the prior art all use silicon dioxide as the waveguide layer. Chinese patent CN102736177A discloses an arrayed waveguide grating structure based on PLC tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/035
CPCG02F1/035G02F2202/20
Inventor 尹锐李江月季伟公姿苏王军宝
Owner SHANDONG UNIV
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