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Device for Brillouin optical time domain reflectometer based on optical phase-locked ring

An optical time domain reflectometer and phase-locked loop technology, applied in spectrum investigation and other directions, can solve the problems of low measurement accuracy, unstable output, and inability to tune the output frequency, and achieve the effect of solving complex processing, reducing costs, and simplifying the system.

Active Publication Date: 2012-12-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the output of the existing Brillouin fiber ring laser is not stable and the output frequency cannot be tuned, resulting in low measurement accuracy; the frequency of the local oscillator light is fixed, and an electric circuit with an adjustable center frequency is required for electrical signal processing. Filter to realize the scanning and measurement of Brillouin spectrum, there is a problem of complex electrical signal processing, a device based on optical phase-locked loop Brillouin optical time domain reflectometer is provided

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  • Device for Brillouin optical time domain reflectometer based on optical phase-locked ring
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specific Embodiment approach 1

[0010] Specific implementation mode one: combine figure 1 Describe this embodiment, the device of the Brillouin optical time domain reflectometer based on the optical phase-locked loop described in this embodiment, it is made up of No. 1 laser 1-1, No. 2 laser 1-2, No. 1 fiber coupler 2- 1. No. 2 fiber coupler 2-2, No. 3 fiber coupler 2-3, No. 4 fiber coupler 2-4, phase-locked loop module 3, electro-optic modulator 4, polarization scrambler 5, circulator 6, optical Attenuator 7, No. 1 erbium-doped fiber amplifier 8-1, No. 2 erbium-doped fiber amplifier 8-2, optical filter 9, double-balanced detector 10, bandpass electric filter 11, data acquisition module 12, detection and amplification module 13 Composed of a pulse generator 14, the output end of the No. 1 laser 1-1 is connected with the optical signal input end of the No. 1 fiber coupler 2-1, and the optical signal output end of the No. 1 fiber coupler 2-1 is connected with the electro-optical modulator at the same time. 4 ...

specific Embodiment approach 2

[0012] Specific implementation mode two: combination figure 2 Describe this embodiment, this embodiment is to further limit the device of the Brillouin optical time-domain reflectometer based on the optical phase-locked loop described in the specific embodiment one, the phase-locked loop module 3 is composed of a directional coupler 3-1, a frequency division device 3-2, phase / frequency discriminator 3-3, reference signal source 3-4, loop filter 3-5 and frequency counting unit 3-6, the electrical signal input terminal of directional coupler 3-1 is a lock The electrical signal input end of the phase loop module 3, the output end of a signal of the directional coupler 3-1 is connected with the input end of the signal of the frequency divider 3-2, and the output end of another signal of the directional coupler 3-1 is connected with The input end of the frequency counting unit 3-6 is connected; the output end of the signal of the frequency divider 3-2 is connected with a signal in...

specific Embodiment approach 3

[0015] Specific embodiment three: this embodiment is to further limit the device of the Brillouin optical time domain reflectometer based on the optical phase-locked loop described in the specific embodiment one, and the first laser 1-1 and the second laser 1-2 both use Single frequency narrow linewidth fiber laser, distributed feedback semiconductor laser or external cavity semiconductor laser.

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Abstract

The invention relates to a device for a Brillouin optical time domain reflectometer, in particular to the device for the Brillouin optical time domain reflectometer based on an optical phase-locked ring, and aims to solve the problems the conventional Brillouin optical fiber ring laser is instable in output, non-tunable in output frequency and low in measuring accuracy, and processing of an electric signal is complicated because local oscillation light is fixed in frequency and a Brillouin spectrum is required to be scanned and measured by using an electric filter with tunable central frequency during processing of the electric signal. The device consists of a first laser, a second laser, a first optical fiber coupler, a second optical fiber coupler, a third optical fiber coupler, a fourth optical fiber coupler, a phase-locked ring module, an electro-optical modulator, a scrambler, a circulator, an optical attenuator, a first erbium-doped optical fiber amplifier, an optical filter, a double-balance detector, a band-pass electric filter, a data acquisition module, a detection amplification module and a pulse generator. The device is applicable to the Brillouin optical time domain reflectometer.

Description

technical field [0001] The invention relates to a device for a Brillouin optical time domain reflectometer. Background technique [0002] Brillouin scattering is an inelastic scattering effect. When a beam of pump light is incident on the fiber, the back self-Brillouin scattering in the fiber contains the anti-Stokes component of the upper frequency shift and the lower frequency shift The Stokes components of the pump light are symmetrically distributed on both sides of the pump light frequency, and the frequency difference between them and the pump light is called the Brillouin frequency shift. The study found that the Brillouin frequency shift is a function of temperature and strain, that is to say, changes in the ambient temperature and strain of the optical fiber will cause changes in the Brillouin frequency shift, so the temperature and strain can be realized by measuring the Brillouin spectrum. Measurement. [0003] The Brillouin optical time domain reflectometer (BO...

Claims

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Application Information

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IPC IPC(8): G01J3/28
Inventor 董永康吕志伟
Owner HARBIN INST OF TECH
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