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A capillary-based Brillouin scattering dynamic grating generation device and method

A technology of Brillouin scattering and dynamic grating, applied in the direction of laser scattering effect, optics, nonlinear optics, etc., can solve the problems of limiting the application of high-resolution spectral analysis technology, achieve simple structure, low cost, and reduce electromagnetic interference Effect

Inactive Publication Date: 2018-02-09
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, they all use ordinary single-mode fiber or polarization-maintaining fiber to produce Brillouin dynamic gratings. The research and development of these Brillouin dynamic gratings are all focused on fixed-frequency pump light to generate fixed gratings. Therefore, the reflection wavelength is also Fixed, which limits the application in high-resolution spectroscopic analysis techniques
In recent years, driven by the development of laser technology, electronic technology and new photodetection elements, spectral resolution and dynamic range have been improved by several orders of magnitude. Therefore, Brillouin dynamic gratings produced by ordinary single-mode fibers or polarization maintaining Difficult to meet these new challenges

Method used

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  • A capillary-based Brillouin scattering dynamic grating generation device and method
  • A capillary-based Brillouin scattering dynamic grating generation device and method

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Embodiment 1

[0019] Embodiment 1: A kind of device based on capillary Brillouin scattering dynamic grating produces, such as figure 1 As shown, two optical paths are included, one optical path is a narrow linewidth tunable laser 201, a coupler 202, an erbium-doped fiber amplifier 203, a first polarization controller 204 and a nonlinear optical fiber 205 connected in sequence, and the other is from the coupler 202 Start by connecting the second polarization controller 208 , the photoline electro-optic modulator 209 , and the polarization beam combiner 210 back to the nonlinear optical fiber 205 in sequence. One end of the synchronization controller 206 is connected to the narrow linewidth tunable laser 201 , and the other end is connected to the photoline electro-optic modulator 209 through the microwave signal source 207 . The detection laser 211 is connected to the polarization beam combiner 210 .

[0020] Specifically, the nonlinear optical fiber 205 in this embodiment is drawn from a p...

Embodiment 2

[0022] Embodiment 2: The same device as in Embodiment 1, the difference is that the outer diameter of the carrier capillary of the nonlinear optical fiber 205 of this embodiment is 110 μm, the inner diameter is 6 μm, and the length is 8 m. Fill with a 50:50 volume mixture of carbon tetrachloride and carbon disulfide. The Brillouin frequency shift of the pump signal of nonlinear fiber 205 at 1550nm is 11.21GHz, so first set the frequency of microwave signal source 207 to 11.21GHz, and make certain fine-tuning, so that the signal of pump light 2 is higher than that of pump light 1 The frequency is as small as 11.21GHz, so that a dynamic grating with tunable pitch can also be obtained.

Embodiment 3

[0023]Example 3: The same as the device in Example 1, the difference is: the outer diameter of the carrier capillary of the nonlinear optical fiber 205 in this example is 95 μm, the inner diameter is 2 μm, and the length is 5 m. Filled volume graphene. The Brillouin frequency shift of the pump signal of the nonlinear fiber 205 at 1550nm is 12.08GHz, so first set the frequency of the microwave signal source 207 to 12.08GHz, and make a certain fine-tuning, so that the signal of the pump light 2 is higher than that of the pump light 1 The frequency is less than 12.08GHz, so that a dynamic grating with tunable grating pitch can also be obtained.

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Abstract

The invention discloses a capillary-based Brillouin scattering dynamic grating generating device and method. A laser generates laser light and separates two beam signals through a coupler. One beam generates back Brillouin scattering in a nonlinear optical fiber, and the other One beam is frequency-shifted by a microwave signal source, so that the frequency difference of the two beams of optical path signals is the magnitude of the optical fiber Brillouin frequency shift, and the Brillouin dynamic grating is excited in the nonlinear optical fiber; the nonlinear optical fiber is filled with a refractive inner core capillary. The present invention proposes a capillary-based Brillouin scattering dynamic grating generation device and method. A certain medium is filled inside the capillary to make a nonlinear optical fiber, and the distribution is adjusted by controlling the wavelength and power of the main laser and the frequency of the microwave signal source. The characteristics of the Liouin dynamic grating can obtain a dynamic grating with tunable grating characteristics, while greatly reducing electromagnetic interference, and has the advantages of small size, high precision, low cost and simple structure.

Description

technical field [0001] The invention relates to a grating generating device and method, in particular to a Brillouin scattering dynamic grating generating device and method. Background technique [0002] Spectral signal measurement is the most commonly used measurement method in the process of optical measurement and detection, and is widely used in the fields of optical communication, national defense, aerospace, environmental protection and materials. Fiber Bragg grating must be used to select signals in spectral signal measurement. Among the measured parameters, measurement resolution is the most important technical index of spectral measurement. Due to the limitations of parameters such as grating groove density and beam aperture, the resolution of the spectrometer based on the traditional grating is only a few pm; compared with the traditional grating spectrometer, the scanning Fabry-Perot interferometer can provide a higher spectrum Resolution, but its wavelength meas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/30G02F1/35
Inventor 朱恩亮
Owner YANCHENG INST OF TECH
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