CN108267231A - High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device - Google Patents
High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device Download PDFInfo
- Publication number
- CN108267231A CN108267231A CN201810224230.4A CN201810224230A CN108267231A CN 108267231 A CN108267231 A CN 108267231A CN 201810224230 A CN201810224230 A CN 201810224230A CN 108267231 A CN108267231 A CN 108267231A
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- Prior art keywords
- optical fiber
- signal
- laser power
- graded index
- fibre
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 58
- 239000000835 fiber Substances 0.000 claims abstract description 44
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 101150020075 GIF1 gene Proteins 0.000 description 4
- 101100286982 Oryza sativa subsp. japonica CIN2 gene Proteins 0.000 description 4
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 101100121774 Arabidopsis thaliana GIF2 gene Proteins 0.000 description 3
- 101100175606 Oryza sativa subsp. japonica AGPL2 gene Proteins 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 101100456571 Mus musculus Med12 gene Proteins 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
Abstract
The invention discloses a kind of high-capacity optical fiber laser power and SBS threshold on-Line Monitor Devices.The pumping input optical fibre of pump combiner in the present invention is connect with graded index multimode fiber one end, one end of the other end connection single mode optical fiber of graded index multimode fiber, the other end of single mode optical fiber and the input terminal of fibre optic isolater connect, the output terminal of fibre optic isolater is connected with the photodetector input terminal with tail optical fiber, photodetector output terminal connection signal control process circuit, the signal control processing circuit monitor that the variation relation of signal controls prime input signal light and pumping source by comparing.The present invention has the function of while monitors output power and stimulated Brillouin scattering threshold value, without water cooling, it is cheap, compact-sized the advantages that.
Description
Technical field
The invention belongs to Fiber laser technology field, more particularly to a kind of high-capacity optical fiber laser output power and it is excited
Brillouin scattering（Stimulated Brillouin Scattering, SBS）Threshold value on-Line Monitor Device.
Background technology
Optical fiber laser is with good beam quality, compact-sized, small, thermal diffusivity is good, the advantages such as easy care.Since double
Since cladded-fiber and high power pump source occur, hundreds of watts or more of high-capacity optical fiber laser is widely used to industry and adds
Work, as steel plate is cut.The finished surface meeting reflecting part of these commercial Applications is divided back laser system and laser output power is had
Shake, and then influence processing quality.In addition high-capacity optical fiber laser generally use master oscillation power amplification（master
oscillator power amplifier, MOPA）Structure realizes power amplification, especially for its power of narrow linewidth laser
Amplification is limited to stimulated Brillouin scattering, and the stokes light of generation can destroy backing system.Therefore it is very necessary to laser
Output power and stimulated Brillouin scattering threshold value carry out real time on-line monitoring.
Mainly have for the power monitoring of high-capacity optical fiber laser at present（1）Based on monitoring pumping source electromotive power output mark
Determine optical output power of laser；（2）The pump light filtered out based on monitoring pumping stripper demarcates output light（Patent
CN102322945A）.There are pumping sources can influence laser with temperature fluctuation and gain fibre itself fuel factor for the former
Output power, damage occur especially for optical fiber can not give warning in advance, thus demarcate there are deviation, also inconvenient malfunction elimination；
The latter, which needs to treat the doubly clad optical fiber that divests, to be handled, and it is limited that the photo-curable glue used bears power capability, needs water
Device for cooling, it is complicated.Simultaneously it is to be noted that the above method all cannot be used for monitoring stimulated Brillouin scattering threshold value.Cause
This, invention one kind can monitor the compact-sized of high-capacity optical fiber laser output power and early warning stimulated Brillouin scattering
Cost-effective monitoring device is of great significance.
Invention content
The present invention is aiming at the deficiencies in the prior art, it is proposed that is filtered out based on monitoring pump combiner pumping input optical fibre
Remaining fundamental signal light variation relation is so as to output power and be excited in cloth after the pump light of reverse transfer and high-order mode light
The miniaturization structure that deep pool scattering is monitored in real time.
In order to solve the above-mentioned technical problem, present invention employs following technological means：
The present invention includes graded index multimode fiber, single mode optical fiber, fibre optic isolater, photodetector and signal control process
Circuit, the pumping input optical fibre of pump combiner are connect with graded index multimode fiber one end, graded index multimode fiber
Other end connection single mode optical fiber one end, the input terminal of the other end of single mode optical fiber and fibre optic isolater connects, Fiber isolation
The output terminal of device is connected with the photodetector input terminal with tail optical fiber, photodetector output terminal connection signal control process electricity
Road, the signal control processing circuit monitor the variation relation of signal to prime input signal light and pumping source by comparing
It is controlled.
Furtherly, the graded index multimode fiber has two sections, for improving coupling efficiency.
Furtherly, for the graded index multimode fiber by drawing cone processing, tapered zone end passes through coreless fiber
It is connect with one end of single mode optical fiber.
Furtherly, pumping input optical fibre to the optical fiber between single mode optical fiber is fixed on aluminum strip.
Furtherly, when the signal monitored is more than setting value and is in nonlinear change, illustrate stimulated Brillouin scattering
Will excite, signal control processing circuit sends out alarm signal, and accordingly reduce main amplifier pumping source supply current or
Person directly cuts off；When the signal monitored is less than setting value, the pumping source of main amplifier and prime input signal are adjusted
It is wide small so as to keep output power constant.
The present invention has the function of while monitors output power and stimulated Brillouin scattering threshold value, and without water cooling, price is low
The advantages that honest and clean, compact-sized.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Specific embodiment
The present invention is using one section or two sections of gradual changes of connection between the pumping input optical fibre and single mode optical fiber of pump combiner
Index multimode fiber（graded index fiber, GIF）Improve coupling efficiency of the light from multimode fibre to single mode optical fiber.
In order to further improve coupling efficiency, graded index fiber can also be carried out to draw cone or use one section of GIF optical fiber and one
The modeling combination of section coreless fiber.The pump light that reverse transfer is filtered out using the fibre optic isolater for working in signal in band keeps basic mode
Flashlight.By the fiber-optical probe incoming fiber optic isolator output terminal with tail optical fiber, optical signal is changed into electric signal, at signal
Reason circuit is monitored output power.When the signal monitored be more than setting value and in nonlinear change when explanation be excited in cloth
Deep pool scattering will excite, and send out alarm signal, and accordingly send out the pumping source supply current of control signal reduction main amplifier
Or it directly cuts off；The pumping source of main amplifier and preceding is adjusted by controller when the signal monitored is less than setting value
Grade input signal light size is so as to keep output power constant.
Embodiment：
As shown in Figure 1, by taking the high-capacity optical fiber laser of MOPA structures as an example, the program is equally applicable to more stages pre-amplification knot
The fiber ring laser system of structure.Realize real time on-line monitoring high-capacity optical fiber laser output power and stimulated Brillouin scattering threshold
The device of value includes the input pumping light fibre 1, graded index multimode fiber 2,3, one sections of coreless fiber of a pump combiner
Single 4, single mode optical fiber isolators of covering single mode optical fiber, 5, one band tail optical fiber photodetector 6 and signal control processing circuit 7.
It is L1 by a length in the pumping input optical fibre welding of pump combiner（2cm or so）Graded-index multimode light
Fine GIF1 in order to better improve through pumping the light of input optical fibre reverse transfer, can carry out GIF1 appropriate draw and bore；GIF1 light
Fine tapered zone end and a length are L2（2cm or so）Coreless fiber is connected carry out pattern modeling operation, can also be according to practical coupling
Efficiency is closed to substitute the other GIF2 optical fiber of coreless fiber；Coreless fiber or GIF2 optical fiber are connected with single mode optical fiber, by high-order
The light of pattern is rejected；Single mode optical fiber output terminal is connected again with the input terminal of fibre optic isolater, for filtering out what is contained in backlight
Basic mode pump light, thus flashlight and stokes light of the ingredient of residual light only containing reverse transfer；Fibre optic isolater it is defeated
Outlet is connected again with the photodetector with tail optical fiber, and optical signal is changed into electric signal；Last photodetector controls again with signal
Processing circuit is connected, and monitors that the variation relation of signal controls prime seed light and pumping source by comparing.Such as
When the signal monitored be more than setting value and in nonlinear change when illustrate that stimulated Brillouin scattering will excite, at signal control
Reason circuit will send out alarm signal, and accordingly send out the pumping source supply current or direct of control signal reduction main amplifier
Cut-out；When the signal monitored is less than setting value, the pumping source and prime of main amplifier are adjusted by signal controller
Input signal light size is so as to keep output power constant.
It, can will be from pumping input light in addition to preferably ensure the fibre junction point in coupling effect and protective device
Fine and GIF1 fusion points start to stretch and fix to the optical fiber between coreless fiber or GIF2 optical fiber and the fusion point of single mode optical fiber
It is long 100mm, on the aluminum strip of width 15mm in a size.
Claims (5)
1. high-capacity optical fiber laser power and SBS threshold on-Line Monitor Device, including graded index multimode fiber, single-mode optics
Fibre, fibre optic isolater, photodetector and signal control processing circuit, which is characterized in that the pumping input light of pump combiner
Fibre is connect with graded index multimode fiber one end, one end of the other end connection single mode optical fiber of graded index multimode fiber,
The other end of single mode optical fiber and the input terminal of fibre optic isolater connect, the output terminal of fibre optic isolater and the photodetection with tail optical fiber
Device input terminal is connected, and photodetector output terminal connection signal control process circuit, the signal control processing circuit passes through ratio
The variation relation for monitoring signal controls prime input signal light and pumping source.
2. high-capacity optical fiber laser power according to claim 1 and SBS threshold on-Line Monitor Device, feature exist
In：The graded index multimode fiber has two sections, for improving coupling efficiency.
3. high-capacity optical fiber laser power according to claim 1 and SBS threshold on-Line Monitor Device, feature exist
In：The graded index multimode fiber by drawing cone processing, tapered zone end pass through coreless fiber and single mode optical fiber one
End connection.
4. high-capacity optical fiber laser power and SBS threshold on-Line Monitor Device according to claims 1 or 2 or 3, special
Sign is：Pumping input optical fibre to the optical fiber between single mode optical fiber is fixed on aluminum strip.
5. high-capacity optical fiber laser power according to claim 1 and SBS threshold on-Line Monitor Device, feature exist
In：When the signal monitored be more than setting value and in nonlinear change when, illustrate that stimulated Brillouin scattering will excite, signal control
Processing circuit processed sends out alarm signal, and accordingly reduces the pumping source supply current of main amplifier or directly cut off；Work as prison
When the signal controlled is less than setting value, the pumping source and prime input signal light size of adjustment main amplifier are so as to keep defeated
Go out power invariability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810224230.4A CN108267231A (en) | 2018-03-19 | 2018-03-19 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810224230.4A CN108267231A (en) | 2018-03-19 | 2018-03-19 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108267231A true CN108267231A (en) | 2018-07-10 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810224230.4A Pending CN108267231A (en) | 2018-03-19 | 2018-03-19 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113031363A (en) * | 2021-02-07 | 2021-06-25 | 贵州理工学院 | Light beam purification device |
| CN113391268A (en) * | 2021-04-27 | 2021-09-14 | 中国人民解放军空军预警学院 | Microwave photon frequency measurement realization method and system |
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| US6324326B1 (en) * | 1999-08-20 | 2001-11-27 | Corning Incorporated | Tapered fiber laser |
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| WO2009138309A1 (en) * | 2008-05-16 | 2009-11-19 | Thales | Power single-mode laser device and amplification system including said laser device |
| US20100061410A1 (en) * | 2008-09-11 | 2010-03-11 | Nikolai Platonov | System and method for controlling nonlinearities in laser units |
| CN101893739A (en) * | 2009-04-23 | 2010-11-24 | Ofs飞泰尔公司 | The spatial filtering of higher mode in the multimode optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113391268A (en) * | 2021-04-27 | 2021-09-14 | 中国人民解放军空军预警学院 | Microwave photon frequency measurement realization method and system |
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Application publication date: 20180710 |