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Single-end fast distributed Brillouin optical time domain reflectometer based on optical chirp chain

An optical time domain reflection and distributed technology, applied in the optical field, can solve the problem of long measurement time, achieve ultra-fast measurement and increase the frequency sweep range.

Pending Publication Date: 2018-12-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of long measurement time of the existing Brillouin optical time domain reflectometer, thereby providing a single-ended fast distributed Brillouin optical time domain reflectometer based on the optical chirp chain

Method used

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  • Single-end fast distributed Brillouin optical time domain reflectometer based on optical chirp chain
  • Single-end fast distributed Brillouin optical time domain reflectometer based on optical chirp chain
  • Single-end fast distributed Brillouin optical time domain reflectometer based on optical chirp chain

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specific Embodiment approach 1

[0028] Specific implementation mode one: combine figure 1 This embodiment is specifically described. The single-ended fast distributed Brillouin optical time-domain reflectometer based on the optical chirped chain described in this embodiment includes a laser, a first electro-optic modulator, a pulse module, an erbium-doped fiber amplifier 1, The circulator 2, the second electro-optic modulator, the chirp chain module, the first filter 3, the balance detector, the filter detection module and the acquisition module; the laser is a distributed feedback fiber laser with an output wavelength of 1550nm.

[0029] The laser output from the laser is divided into 2 paths through a 50:50 coupler, one path of light is used to generate 10ns pulse pump light, and the other path of light is used to generate down-frequency shifted reference light;

[0030] The one path of light is modulated into pulse light by the first electro-optic modulator, the pulse signal of the first electro-optic mod...

specific Embodiment approach 2

[0036] Specific implementation mode two: combination figure 2 This embodiment is described in detail. This embodiment is a further description of the single-ended fast distributed Brillouin optical time-domain reflectometer based on the optical chirped chain described in the first embodiment. In this embodiment, in this embodiment , the first filter 3 is realized by using a fiber Bragg grating FBG.

specific Embodiment approach 3

[0037] Specific implementation mode three: combination image 3 This embodiment is specifically described. This embodiment is a further description of the single-ended fast distributed Brillouin optical time-domain reflectometer based on the optical chirp chain described in the first embodiment. In this embodiment, the first filter 3 achieved with an injection-locked laser.

[0038] In this implementation manner, the injection locking technology is used to realize the generation of the optical chirp chain, so as to ensure a smoother output amplitude of the optical chirp chain. The optical chirped signal light enters the injection-locked laser through the optical circulator. The injection-locked laser has the functions of filtering, amplifying and ensuring the same output amplitude at different frequencies. The injection-locked laser filters out the lower sideband as the reference light and outputs it through the optical circulator.

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Abstract

The invention discloses a single-end fast distributed Brillouin optical time domain reflectometer based on an optical chirp chain, relates to the technology of the single-end fast measurement of the strain and temperature of distributed optical fibers, and aims at solving a problem that a conventional Brillouin optical time domain reflectometer is long in measurement time. According to the invention, one path of light is modulated into pulsed light through a first electrooptical modulator, and the pulsed light is amplified by an erbium-doped optic fiber amplifier as pump light, enabling the pump light to sequentially pass through a first port and a second port of a circulator, and then inputting the light through one end of a to-be-tested optical fiber. The other path of light is modulatedinto optical chirp signal light through a second electrooptical modulator, and the lower sideband of the optical chirp signal light is filtered by a first filter as reference light. A spontaneous Brillouin signal outputted by the circulator and the reference light perform the beat frequency operation, and a balance detector detects a beat frequency signal and performs the photoelectric conversion. An electric signal is filtered and detected by a filter detection module, and a collection module collects an output signal of the filter detection module. The Brillouin optical time domain reflectometer is suitable for the measurement of superfast single-end distributed Brillouin temperature and strain.

Description

technical field [0001] The invention belongs to the field of optics, and in particular relates to a single-end rapid measurement technology of distributed optical fiber strain and temperature. Background technique [0002] Sensing technology plays an important role in developing the economy and promoting social progress, and has been widely used in a wide range of fields such as industrial production, civil engineering, environmental protection, and biomedicine. Scattering optical fiber sensors use optical fibers to transmit and sense signals simultaneously, realizing distributed measurement in the true sense. The sensing system using self-Brillouin scattering is called a reflectometer, and the Brillouin optical time domain reflectometer (BOTDR) has the advantages of single-ended measurement, easy layout and the ability to continue to work in the case of fiber damage, and has become an engineering application. important monitoring program. [0003] In the existing Brilloui...

Claims

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Application Information

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IPC IPC(8): G01D5/353G01D21/02
CPCG01D5/35316G01D21/02
Inventor 董永康王本章巴德欣李惠
Owner HARBIN INST OF TECH
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