CN102967371B - Device and method for measuring brillouin gain spectrum in non-scanning manner based on pumping-detection method - Google Patents
Device and method for measuring brillouin gain spectrum in non-scanning manner based on pumping-detection method Download PDFInfo
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Abstract
A device and a method for measuring a brillouin gain spectrum in a non-scanning manner based on a pumping-detection method relate to a device and a method for measuring the brillouin gain spectrum and aim to solve the problems of low signal-to-noise ratio, long measurement time and complex device of the conventional device and method in brillouin gain spectrum measurement. In the device for measuring the brillouin gain spectrum in the non-scanning manner based on the pumping-detection method, the laser output end of an optical fiber laser is communicated with the first port of an optical fiber circulator; the second port of the optical fiber circulator is communicated with the first port of a polarization controller, and the second port of the polarization controller is communicated with one end of an optical fiber to be measured; the laser output end of an ASE (Amplified Spontaneous Emission) light source is communicated with the light input end of an optical fiber isolator; the light output end of the optical fiber isolator is communicated with the other end of the optical fiber to be measured; and the third port of the optical fiber circulator serves as the light output end of the device for measuring the brillouin gain spectrum in the non-scanning manner based on the pumping-detection method; and besides, the connection is optical fiber connection. The device and the method provided by the invention are suitable for measuring the brillouin gain spectrum.
Description
Technical field
The present invention relates to a kind of device and method measuring brillouin gain spectrum.
Background technology
Brillouin gain spectrum comprises the important informations such as Brillouin shift, live width and gain envelope, is widely used in the filter and amplification and Brillouin laser radar detection etc. of distributing optical fiber sensing, feeble signal.At present, the device and method measuring brillouin gain spectrum mainly contains two large classes: one is single-ended method, namely be only input to by pump light in nonlinear medium (as optical fiber, water etc.), the spectrum of its backward Brillouin scattering Stokes light is called the brillouin gain spectrum of nonlinear medium; Two is both-end methods, i.e. pumping-detection method, "-" represents the method application two-way light, one tunnel is pump light, another road is detection light, tunable laser or microwave generator is adopted to control the detection light that electro-optic intensity modulator produces Stokes frequency displacement, the pump light that this detection light and subtend are propagated interacts in Brillouin amplifier medium, realize pump light to the energy or the power transfer that detect light, when near Stokes frequency displacement, continuous sweep detects the frequency of light, at the detection light spectrum that the output terminal of amplifier is amplified, be brillouin gain spectrum.The device of method one is fairly simple, only needs to introduce a branch of pump light, but the brillouin gain spectrum signal to noise ratio (S/N ratio) measured is poor (see Opt.Lett.2010, vol.35,3985-3987), particularly in the application of distributing optical fiber sensing, the method seriously constrains its detection range; Although the device of method two is more complicated, the brillouin gain spectrum signal to noise ratio (S/N ratio) higher (see Opt.Lett.2011, vol.36,2378-2380) measured is the device and method that current distributing optical fiber sensing is conventional.But need the frequency of scanning probe light in method two, cause the Measuring Time of brillouin gain spectrum longer, cannot obtain heat transfer agent in real time, accurately and rapidly, this is also the major defect limiting its application.Publication number is the patent of invention of CN101247179A is immediate prior art with the application.
Summary of the invention
The object of the invention is to solve the problem that the signal to noise ratio (S/N ratio) measuring brillouin gain spectrum in existing apparatus and method is lower, Measuring Time is long and device is complicated, providing the device and method that pumping-detection method non-scanning type measures brillouin gain spectrum.
Pumping-detection method non-scanning type measures the device of brillouin gain spectrum, and it is made up of fiber laser, fiber optical circulator, Polarization Controller, testing fiber, fibre optic isolater and ASE light source;
The laser output of fiber laser is communicated with the first port of fiber optical circulator, and the second port of fiber optical circulator is communicated with the first port of Polarization Controller, and the second port of Polarization Controller is communicated with one end of testing fiber; The laser output of ASE light source is communicated with the light input end of fibre optic isolater, the light output end of fibre optic isolater is communicated with the other end of testing fiber, 3rd port of fiber optical circulator is the light output end that described pumping-detection method non-scanning type measures the device of brillouin gain spectrum, and above-mentioned connection is Fiber connection.
The device adopting pumping-detection method non-scanning type to measure brillouin gain spectrum obtains the method for brillouin gain spectrum, and the concrete steps that it comprises are as follows:
Steps A 1, fiber laser export C-band laser of narrowband;
Steps A 2, C-band laser of narrowband enter one end of testing fiber successively through the first port of fiber optical circulator, the second port and Polarization Controller, this light is as pump light;
Steps A 3, ASE light source export C-band broad band laser;
Steps A 4, C-band broad band laser enter the other end of testing fiber through fibre optic isolater, this light is as detection light;
Steps A 5, in testing fiber, meet testing fiber Brillouin shift in pump light and detection light and frequency component in brillouin gain spectral limit interacts simultaneously, and Brillouin amplification is carried out to detection light;
Steps A 6, the detection light amplified enter optical fiber circulator through Polarization Controller, are exported by the 3rd port of fiber optical circulator;
Steps A 7: the detection light Fabry-Perot interferometer of amplification or the method for heterodyne detection are processed, obtain its spectral distribution, described spectral distribution is the brillouin gain spectrum of testing fiber.
The present invention is based on pumping-detection method, replace traditional tunable narrow-band laser instrument or microwave generator and electro-optic intensity modulator with ASE light source, do not need to carry out frequency sweeping to detection light, can sweep time be saved, thus greatly shorten Measuring Time, realize real-time detection; The present invention compares with single-ended method, more flexible can detect the power of light, and its power stability, signal to noise ratio (S/N ratio) improves more than 10dB, and the present invention does not need scanister, so simpler than existing pumping-detection subtraction unit, in remote distributing optical fiber sensing, there are huge applications potentiality.
Accompanying drawing explanation
Fig. 1 is the composition structural representation that pumping-detection method non-scanning type measures the device of brillouin gain spectrum;
Fig. 2 is that curve a is the curve that experiment measuring goes out, and curve b is Lorentz fit curve by the brillouin gain spectrum that apparatus of the present invention are measured in embodiment eight;
Fig. 3 is the process flow diagram that the device adopting pumping-detection method non-scanning type to measure brillouin gain spectrum obtains the method for brillouin gain spectrum.
Embodiment
Embodiment one: composition graphs 1 illustrates present embodiment, pumping-detection method non-scanning type described in present embodiment measures the device of brillouin gain spectrum, and it is made up of fiber laser 1, fiber optical circulator 2, Polarization Controller 3, testing fiber 4, fibre optic isolater 5 and ASE light source 6;
The laser output of fiber laser 1 is communicated with the first port 2-1 of fiber optical circulator 2, and the second port 2-2 of fiber optical circulator 2 is communicated with the first port of Polarization Controller 3, and the second port of Polarization Controller 3 is communicated with one end of testing fiber 4; The laser output of ASE light source 6 is communicated with the light input end of fibre optic isolater 5, the light output end of fibre optic isolater 5 is communicated with the other end of testing fiber 4,3rd port 2-3 of fiber optical circulator 2 is the light output end that described pumping-detection method non-scanning type measures the device of brillouin gain spectrum, and above-mentioned connection is Fiber connection.
The present invention adopts ASE light source as probe source, effectively can not only shorten Measuring Time, and the signal to noise ratio (S/N ratio) of brillouin gain spectrum is also higher, and measurement mechanism is simple, easy and simple to handle.
Embodiment two: the difference that pumping-detection method non-scanning type described in present embodiment and embodiment one measures the device of brillouin gain spectrum is, the laser that described fiber laser 1 exports is C-band laser of narrowband, wavelength is 1550nm, and live width scope is 1KHz-10MHz.
Embodiment three: the difference that pumping-detection method non-scanning type described in present embodiment and embodiment one measures the device of brillouin gain spectrum is, the laser that described ASE light source 6 exports is C-band broad band laser, near 1550nm, spectrum is smooth, and spectrum flat extent is 1nm-40nm.
Embodiment four: composition graphs 3 illustrates present embodiment, the device adopting the pumping-detection method non-scanning type described in embodiment one to measure brillouin gain spectrum obtains the method for brillouin gain spectrum, and the concrete steps that it comprises are as follows:
Steps A 1, fiber laser 1 export C-band laser of narrowband;
Steps A 2, C-band laser of narrowband enter one end of testing fiber successively through the first port of fiber optical circulator 2, the second port and Polarization Controller 3, this light is as pump light;
Steps A 3, ASE light source 6 export C-band broad band laser;
Steps A 4, C-band broad band laser enter the other end of testing fiber through fibre optic isolater 5, this light is as detection light;
Steps A 5, in testing fiber, meet testing fiber Brillouin shift in pump light and detection light and frequency component in brillouin gain spectral limit interacts simultaneously, and Brillouin amplification is carried out to detection light;
Steps A 6, the detection light amplified enter optical fiber circulator 2 through Polarization Controller 3, are exported by the 3rd port of fiber optical circulator 2;
Steps A 7: the detection light Fabry-Perot interferometer of amplification or the method for heterodyne detection are processed, obtain its spectral distribution, described spectral distribution is the brillouin gain spectrum of testing fiber.
Embodiment five: the difference of the method for present embodiment and the acquisition brillouin gain spectrum described in embodiment four is, the C-band laser of narrowband in described steps A 1 is wavelength is 1550nm, and live width scope is the laser of 1KHz-10MHz.
Embodiment six: the difference of the method for present embodiment and the acquisition brillouin gain spectrum described in embodiment four is, C-band broad band laser in described steps A 3 is that spectrum is smooth near 1550nm, and spectrum flat extent is the laser of 1nm-40nm.
Embodiment seven: the difference of the method for present embodiment and the acquisition brillouin gain spectrum described in embodiment four is, controls the power of the pump light in described steps A 2 below the stimulated Brillouin scattering threshold value of testing fiber.
Embodiment eight: the difference of the method for present embodiment and the acquisition brillouin gain spectrum described in embodiment seven is, the choosing method of the stimulated Brillouin scattering threshold value of described testing fiber is: the stimulated Brillouin scattering threshold value of pumping light power corresponding when the ratio of the back scattering luminous power that described pump light is produced by testing fiber and pumping light power is 1% testing fiber for this reason.
Embodiment nine: present embodiment provides the method specific embodiment that a device adopting pumping-detection method non-scanning type to measure brillouin gain spectrum obtains brillouin gain spectrum, and the measurement mechanism of brillouin gain spectrum as shown in Figure 1.
Steps A 1, fiber laser output wavelength are 1550nm, and laser linewidth is the C-band laser of narrowband of 50kHz;
Steps A 2, C-band laser of narrowband enter one end of the long single-mode fiber of 1000m successively through the first port of fiber optical circulator, the second port and Polarization Controller, this light is as pump light;
Steps A 3, ASE light source output spectrum flat extent are the C-band broad band laser of 1525nm-1565nm;
Steps A 4, C-band broad band laser enter the other end of the long single-mode fiber of 1000m through fibre optic isolater, and this light is as detection light;
Steps A 5, in the single-mode fiber that 1000m is long, meet testing fiber Brillouin shift in pump light and detection light and frequency component in brillouin gain spectral limit interacts simultaneously, and Brillouin amplification is carried out to detection light;
Steps A 6, the detection light amplified enter optical fiber circulator through Polarization Controller, are exported by the 3rd port of fiber optical circulator;
Steps A 7: with the detection light spectrum of the method measuring and amplifying of heterodyne detection, brillouin gain spectrum corresponding when acquisition detection light amplification multiplying power is 2.2 times.
Fiber laser in present embodiment selects NKT photonic company Koheras Adjustik System's, and output power is adjustable within the scope of 0-100mW, and output wavelength is 1550nm, and laser linewidth is the laser instrument of 50kHz.
ASE light source in present embodiment selects peak power output to be 10mW, and the spectrum flat extent of Output of laser is the ASE light source of 1525nm-1565nm.
Contain the whole frequency components in brillouin gain spectrum due to detection light, be amplified after these frequency components and pump light effect simultaneously, therefore do not need to carry out frequency sweeping.
Brillouin gain spectrum corresponding when being 2.2 times that Fig. 2 is detection light amplification multiplying power, can find out, its spectral shape is lorentzian curve, and Brillouin shift is 10.87GHz, and live width is 22.5MHz, consistent with the result that classic method is measured; The brillouin gain spectral curve measured based on the present invention is more smooth, and signal to noise ratio (S/N ratio) is higher.
Claims (8)
1. pumping-detection method non-scanning type measures the device of brillouin gain spectrum, and it is made up of fiber laser (1), fiber optical circulator (2), Polarization Controller (3), testing fiber (4), fibre optic isolater (5) and ASE light source (6);
It is characterized in that, the laser output of fiber laser (1) is communicated with first port (2-1) of fiber optical circulator (2), second port (2-2) of fiber optical circulator (2) is communicated with the first port of Polarization Controller (3), and the second port of Polarization Controller (3) is communicated with one end of testing fiber (4); The laser output of ASE light source (6) is communicated with the light input end of fibre optic isolater (5), the light output end of fibre optic isolater (5) is communicated with the other end of testing fiber (4), 3rd port (2-3) of fiber optical circulator (2) measures the light output end of the device of brillouin gain spectrum for described pumping-detection method non-scanning type, above-mentioned connection is Fiber connection.
2. pumping-detection method non-scanning type according to claim 1 measures the device of brillouin gain spectrum, it is characterized in that, the laser that described fiber laser (1) exports is C-band laser of narrowband, and wavelength is 1550nm, and live width scope is 1KHz-10MHz.
3. pumping-detection method non-scanning type according to claim 1 measures the device of brillouin gain spectrum, it is characterized in that, the laser that described ASE light source (6) exports is C-band broad band laser, and near 1550nm, spectrum is smooth, and spectrum flat extent is 1nm-40nm.
4. the device adopting pumping-detection method non-scanning type according to claim 1 to measure brillouin gain spectrum obtains the method for brillouin gain spectrum, and the concrete steps that it comprises are as follows:
Steps A 1, fiber laser (1) export C-band laser of narrowband;
Steps A 2, C-band laser of narrowband enter one end of testing fiber successively through the first port of fiber optical circulator (2), the second port and Polarization Controller (3), this light is as pump light;
Steps A 3, ASE light source (6) export C-band broad band laser;
Steps A 4, C-band broad band laser enter the other end of testing fiber through fibre optic isolater (5), and this light is as detection light;
Steps A 5, in testing fiber, meet testing fiber Brillouin shift in pump light and detection light and frequency component in brillouin gain spectral limit interacts simultaneously, and Brillouin amplification is carried out to detection light;
Steps A 6, the detection light amplified enter optical fiber circulator (2) through Polarization Controller (3), are exported by the 3rd port of fiber optical circulator (2);
Steps A 7: the detection light Fabry-Perot interferometer of amplification or the method for heterodyne detection are processed, obtain its spectral distribution, described spectral distribution is the brillouin gain spectrum of testing fiber.
5. the method for acquisition brillouin gain spectrum according to claim 4, is characterized in that, the C-band laser of narrowband in described steps A 1 is wavelength is 1550nm, and live width scope is the laser of 1KHz-10MHz.
6. the method for acquisition brillouin gain spectrum according to claim 4, is characterized in that, the C-band broad band laser in described steps A 3 is that spectrum is smooth near 1550nm, and spectrum flat extent is the laser of 1nm-40nm.
7. the method for acquisition brillouin gain spectrum according to claim 4, is characterized in that, controls the power of the pump light in described steps A 2 below the stimulated Brillouin scattering threshold value of testing fiber.
8. the method for acquisition brillouin gain spectrum according to claim 7, it is characterized in that, the choosing method of the stimulated Brillouin scattering threshold value of described testing fiber is: the stimulated Brillouin scattering threshold value of pumping light power corresponding when the ratio of the back scattering luminous power that described pump light is produced by testing fiber and pumping light power is 1% testing fiber for this reason.
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| CN103292903B (en) * | 2013-06-09 | 2014-12-10 | 哈尔滨工业大学 | Spectrum analytical device and spectrum analytical method based on Brillouin dynamic grating |
| CN103335967B (en) * | 2013-06-24 | 2015-03-04 | 南昌航空大学 | Fiber loop cavity ringdown spectroscopy device based on Brillouin slow light effect |
| CN103308171B (en) * | 2013-06-26 | 2015-01-28 | 哈尔滨理工大学 | Device and method for measuring optical Brillouin gain spectrum by aid of rectangular spectrum probe light |
| CN103604450A (en) * | 2013-11-22 | 2014-02-26 | 哈尔滨理工大学 | Seed injection BOTDR distributed optical fiber sensing system |
| CN105865628B (en) * | 2016-05-16 | 2017-10-03 | 中国电子科技集团公司第四十一研究所 | A kind of spectroscopic analysis system and method based on stimulated Brillouin effect |
| CN110487309B (en) * | 2019-09-16 | 2020-08-21 | 北京邮电大学 | Optical fiber detection method and system |
| CN115494046A (en) * | 2022-09-06 | 2022-12-20 | 重庆大学 | Trace multi-component gas optical fiber distributed detection method and device |
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| JP3000948B2 (en) * | 1997-01-16 | 2000-01-17 | 日本電気株式会社 | Optical amplifier |
| US6961170B2 (en) * | 2004-03-19 | 2005-11-01 | Jeffrey Miller Hubbard | Optical parametric amplifier and method for implementing same |
| US7539231B1 (en) * | 2005-07-15 | 2009-05-26 | Lockheed Martin Corporation | Apparatus and method for generating controlled-linewidth laser-seed-signals for high-powered fiber-laser amplifier systems |
| CN101247179A (en) * | 2008-03-11 | 2008-08-20 | 西南交通大学 | Broadband light source optimization pump device used for SBS slow light detention |
| CN101908709A (en) * | 2010-07-26 | 2010-12-08 | 西南交通大学 | Multi-wavelength Brillouin erbium-doped fiber laser with annular cavity based on Taiji structure |
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