CN101762343B - Method for measuring temperature of optical fiber core - Google Patents
Method for measuring temperature of optical fiber core Download PDFInfo
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- CN101762343B CN101762343B CN2010101017707A CN201010101770A CN101762343B CN 101762343 B CN101762343 B CN 101762343B CN 2010101017707 A CN2010101017707 A CN 2010101017707A CN 201010101770 A CN201010101770 A CN 201010101770A CN 101762343 B CN101762343 B CN 101762343B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 49
- 230000008878 coupling Effects 0.000 claims description 32
- 238000010168 coupling process Methods 0.000 claims description 32
- 238000005859 coupling reaction Methods 0.000 claims description 32
- 230000007246 mechanism Effects 0.000 claims description 32
- 238000009795 derivation Methods 0.000 claims description 8
- 238000009738 saturating Methods 0.000 claims description 8
- 230000008676 import Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000012806 monitoring device Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 241000931526 Acer campestre Species 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009022 nonlinear effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010034960 Photophobia Diseases 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 208000013469 light sensitivity Diseases 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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Abstract
A method for measuring the temperature of the core of an optical fiber in a high power fiber laser or fiber amplifier, comprising: manufacturing a Bragg grating on a fiber core of an optical fiber to be detected; calibrating the Bragg grating temperature and the Bragg grating central wavelength; a leading-in double-color coupler and a leading-out double-color coupler are respectively arranged in light paths at two ends of the high-power optical fiber laser or the optical fiber amplifier, and a monitoring signal light source and a monitoring signal light monitoring device are arranged; measuring; and determining the temperature of the fiber core with the Bragg grating part in the optical fiber according to the temperature-wavelength calibration relation.
Description
Technical field
The present invention is relevant with high-capacity optical fiber laser and amplifier, particularly a kind of measuring method that is used for the temperature of optical fiber core of high-capacity optical fiber laser and amplifier.
Background technology
When high-capacity optical fiber laser and fiber amplifier system long-play, laser medium in the Active Optical Fiber is owing to be subjected to the thermal effect that effect produced such as pump light, to cause the rising of Active Optical Fiber temperature, core segment particularly, owing to concentrated most heat and cross-sectional area less, need monitor in real time its temperature, so that take corresponding cooling provision, otherwise might cause the generation of various nonlinear effects and make declines such as system's emitting laser beam quality and oblique efficient, burn out optical fiber or relevant components and parts when serious.
At present, in a large amount of investigative techniques, all just in theory the temperature of optical fiber in high-capacity optical fiber laser and the amplifier is estimated (to deliver " Thermal effects in a dual-clad ytterbium fiberlaser " referring to Nathan A.Brilliant and KalliroiLagonik, OPTICS LETTERS, Vol.26 (21), 2001,1669-1671), also there is not a kind of accurate measurement fibre core method of temperature.
Summary of the invention
The purpose of this invention is to provide a kind of measuring method that is used for high-capacity optical fiber laser and fiber amplifier temperature of optical fiber core, with the temperature of fiber core in accurate measurement high-capacity optical fiber laser and the fiber amplifier, implement heat management to high-capacity optical fiber laser and amplifier.Promptly the temperature of Optical Maser System is monitored in real time, thereby taked corresponding temperature control cooling scheme, avoid the decline of various thermic nonlinear effects and shoot laser beam quality and oblique efficient etc. as far as possible.
Technical solution of the present invention is as follows:
A kind of measuring method that is used for high-capacity optical fiber laser or fiber amplifier temperature of optical fiber core, its characteristics are to comprise the following steps: to make Bragg grating at the testing fiber fibre core; Bragg grating temperature and the calibration of Bragg grating centre wavelength; In the light path at the two ends of described high-capacity optical fiber laser or fiber amplifier, be provided with respectively and import double-colored coupling mechanism and derive double-colored coupling mechanism, monitor signal light source and monitor signal photo detector are set; Measure; According to described temperature-wavelength scaling relation, determine to be carved with in the optical fiber temperature of the fibre core at Bragg grating position.
A kind of measuring method that is used for high-capacity optical fiber laser or fiber amplifier temperature of optical fiber core, its characteristics are specifically to comprise the following steps:
1. make Bragg grating (being designated hereinafter simply as FBG) at the temperature of the fiber core of high-capacity optical fiber laser to be measured or fiber amplifier place to be monitored;
2. bragg grating temperature and Bragg grating centre wavelength calibration: the monitor signal light beam that will comprise the centre wavelength of described Bragg grating is gone into an end of described optical fiber, other end output and importing monitor signal photo detector from this optical fiber, when the Bragg grating place of described optical fiber is applied heat and monitor its temperature, utilize described monitor signal photo detector to write down the centre wavelength of Bragg grating in the described monitor signal light, obtain the variation of described Bragg grating centre wavelength and the residing temperature relation of Bragg grating of described optical fiber, i.e. temperature-wavelength scaling relation;
3. the described optical fiber that is manufactured with Bragg grating is reloaded described high-capacity optical fiber laser or fiber amplifier;
4. in the light path at the two ends of described high-capacity optical fiber laser or fiber amplifier, be provided with respectively and import double-colored coupling mechanism and derive double-colored coupling mechanism, the double-colored coupling mechanism of described importing and to derive double-colored coupling mechanism be high anti-and to the high saturating device of work laser of fiber laser or fiber amplifier to described monitor signal light, outside the double-colored coupling mechanism of described importing, the monitor signal light source is set, described monitor signal photo detector is set at the reflection outbound course of the double-colored coupling mechanism of described derivation;
5. in described high-capacity optical fiber laser or fiber amplifier work, open described monitor signal light source, inject described monitor signal light by the double-colored coupling mechanism of described importing, this monitor signal light is through the Bragg grating of described optical fiber, after the double-colored coupling mechanism reflection of described derivation, monitor by described monitor signal photo detector, by measuring the variation of the monitor signal center wavelength of light of exporting, according to described temperature-wavelength scaling relation, determine to be carved with in the optical fiber temperature of the fibre core at Bragg grating position.
Inscribe Bragg grating with different centre wavelength in described fiber core diverse location many places, and monitor signal light is set in the light path of described high-capacity optical fiber laser or fiber amplifier imports double-colored coupling mechanism and derive double-colored coupling mechanism, and utilize the monitoring device of monitor signal light to monitor, with realization the temperature of corresponding fibre core position is monitored.
Described double-colored coupling mechanism is dichroic mirror or wavelength division multiplexer.
Described monitor signal photo detector is a spectroanalysis instrument.
Bragg grating FBG length is L, and n represents refractive index, λ
BBe Prague centre wavelength, Δ T is the temperature change amount, Δ λ
BBe Prague centre wavelength change amount, then FBG is when only being subjected to influence of temperature change, and the following relationship formula is satisfied in the variation of Bragg grating centre wavelength:
Utilize the variation that this formula can be by FBG centre wavelength and utilize temperature-wavelength scaling relation to release variation of temperature.This also is that the present invention is with the ultimate principle of FBG as temperature sensor.
The present invention also comprises this situation, be the superpower laser and the amplifier of full fiberize, no longer need various dichroic mirrors this moment, but by optical wavelength-division multiplex (WDM) technology, utilize the optical fibre wavelength division multiplexer (wavelength optical signals is combined) and the optical fiber demodulation multiplexer (light signal of combined wave length is separated) of respective wavelength to replace corresponding dichroic mirror, will monitor light importing and guiding system accordingly and get final product.When utilizing FBG, only need to swash and penetrate optical maser wavelength and get final product with separating as the FBG centre wavelength of temperature detection as the laserresonator of full optical fiber superpower laser.
The present invention has lot of advantages:
Measuring method of the present invention is simple, test result is accurate, good reproducibility, system and device is uncomplicated, being convenient to light path regulates, antijamming capability is strong, and the present invention especially can realize the real time on-line monitoring to optical fiber diverse location place fibre core temperature in high-capacity optical fiber laser and the amplifier, only increases in corresponding optical fiber measurement point and inscribes the dichroic mirror that FBG and corresponding increase be used to import and derive monitor signal light and get final product.
Description of drawings
Fig. 1 is the structural representation that one embodiment of the invention is used for the measuring method of high-capacity optical fiber laser temperature of optical fiber core.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and embodiment, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is the structural representation that one embodiment of the invention is used for the measuring method of high-capacity optical fiber laser temperature of optical fiber core.
The formation of high-capacity optical fiber laser among the figure: comprise pump light 11, along these pump light 11 outbound courses is dichroic mirror 21, focusing coupled lens 31, Active Optical Fiber 4, collimation lens 32 successively, 21 pairs of pump lights of described dichroic mirror 11 are high saturating and high anti-to work laser, laserresonator is made of the right side of total reflective mirror 51 and Active Optical Fiber 4, and through collimation lens 32 outputs is to swash to penetrate laser beam 52.
The measuring method of carrying out temperature of optical fiber core in the face of such high-capacity optical fiber laser comprises the following steps:
1. making centre wavelength at the temperature of optical fiber 4 fibre cores of high-capacity optical fiber laser to be measured or fiber amplifier place to be monitored is the Bragg grating 41 of 1550nm;
2. bragg grating temperature and Bragg grating centre wavelength calibration: the monitor signal light beam that will comprise the centre wavelength of described Bragg grating 41 is gone into an end of described optical fiber 4, other end output and importing monitor signal photo detector from this optical fiber 4, when Bragg grating 41 places of described optical fiber 4 are applied heat and monitor its temperature, utilize the centre wavelength of Bragg grating in the described monitor signal light of described monitor signal photo detector 62 records, obtain the variation of described Bragg grating centre wavelength and the Bragg grating 41 residing temperature relations of described optical fiber 4, i.e. temperature-wavelength scaling relation;
3. the described optical fiber 4 that is manufactured with Bragg grating 41 is reloaded described high-capacity optical fiber laser or fiber amplifier;
4. in the light path at the two ends of described high-capacity optical fiber laser or fiber amplifier, as shown in Figure 1, at described dichroic mirror 21, focus on to be provided with between the coupled lens 31 and import double-colored coupling mechanism 22, being provided with in the light path of described collimation lens 32 derives double-colored coupling mechanism 23, the double-colored coupling mechanism of described importing 22 and to derive double-colored coupling mechanism 23 be high anti-and to the high saturating device of work laser of fiber laser or fiber amplifier to described monitor signal light, outside the double-colored coupling mechanism 22 of described importing, monitor signal light source 61 is set, described monitor signal photo detector 62 is set at the reflection outbound course of the double-colored coupling mechanism 23 of described derivation;
5. in described high-capacity optical fiber laser or fiber amplifier work, open described monitor signal light source 61, inject described monitor signal light by the double-colored coupling mechanism 22 of described importing, this monitor signal light is through the Bragg grating 41 of described optical fiber 4, after double-colored coupling mechanism 23 reflections of described derivation, monitor by described monitor signal photo detector 62, by measuring the variation of the monitor signal center wavelength of light of exporting, according to described temperature-wavelength scaling relation, determine to be carved with in the optical fiber 4 temperature of the fibre core at Bragg grating 41 positions.
Be the concrete parameter of this embodiment below:
The yb-doped double-clad fiber 4 of 15m constitutes high-capacity optical fiber laser as gain media, and the operation wavelength of this laser instrument is 1080nm;
The centre wavelength of monitor signal light source 61 is 1550nm;
Monitor signal photo detector 62 is a spectroanalysis instrument;
The double-colored coupling mechanism of described importing 22 and derive double-colored coupling mechanism 23 for importing dichroic mirror and derive dichroic mirror, described importing dichroic mirror and to derive dichroic mirror be high anti-and to the high saturating dichroic mirror of fiber laser work laser 1080nm to described monitor signal light 1550nm;
In advance the FBG that inscribes in Active Optical Fiber is carried out the demarcation of temperature-wavelength.With centre wavelength is the semiconductor laser diode LD pumping of 975nm, pump light is high saturating and penetrate the high anti-dichroic mirror of laser 21, in the face of wavelength is that the monitoring light of 1550nm is high anti-and to behind the high saturating importing dichroic mirror of 975nm and 1080nm light and focal length that is used to the focus on planoconvex lens 31 that is 48mm to swashing near the 1080nm wavelength in the face of the 975nm wavelength light through one, is coupled into one section and is carved with in 1550nm monitoring light sensitivity, the Active Optical Fiber 4 near the adiaphorous FBG41 of laser wavelength 975nm and the 1080nm.The light of output earlier is planoconvex lens 32 collimations of 48mm through focal length, then through one in the face of 1550nm monitoring light high anti-, swash near to the 1080nm wavelength and penetrate the high saturating derivation dichroic mirror beam split of laser.By monitoring light spectral centroid wavelength change in the observation spectrum analyser, accurately determine to be carved with in the optical fiber 4 the fibre core temperature at FBG position 41 by wavelength-Temperature Scaling optical fiber.
Claims (4)
1. a measuring method that is used for high-capacity optical fiber laser or fiber amplifier temperature of optical fiber core is characterized in that specifically comprising the following steps:
1. make Bragg grating (41) at the temperature of optical fiber (4) fibre core of high-capacity optical fiber laser to be measured or fiber amplifier place to be monitored;
2. bragg grating temperature and Bragg grating centre wavelength calibration: the monitor signal light beam that will comprise the centre wavelength of described Bragg grating (41) is gone into an end of described optical fiber (4), other end output and importing monitor signal photo detector (62) from this optical fiber (4), to the Bragg grating (41) of described optical fiber (4) when locating to apply heat and monitor its temperature, utilize the centre wavelength of Bragg grating in the described monitor signal light of described monitor signal photo detector (62) record, obtain the variation of described Bragg grating centre wavelength and the residing temperature relation of Bragg grating (41) of described optical fiber (4), abbreviate temperature-wavelength scaling relation as;
3. the described optical fiber (4) that is manufactured with Bragg grating (41) is reloaded described high-capacity optical fiber laser or fiber amplifier;
4. in the light path at the two ends of described high-capacity optical fiber laser or fiber amplifier, be provided with respectively and import double-colored coupling mechanism (22) and derivation double-colored coupling mechanism (23), the double-colored coupling mechanism of described importing (22) and to derive double-colored coupling mechanism (23) be high anti-and to the high saturating device of work laser of fiber laser or fiber amplifier to described monitor signal light (61), monitor signal light source (61) is set outside the double-colored coupling mechanism of described importing (22), described monitor signal photo detector (62) is set at the reflection outbound course of the double-colored coupling mechanism of described derivation (23);
5. in described high-capacity optical fiber laser or fiber amplifier work, open described monitor signal light source (61), inject described monitor signal light by the double-colored coupling mechanism of described importing (22), this monitor signal light is through the Bragg grating (41) of described optical fiber (4), after the double-colored coupling mechanism of described derivation (23) reflection, monitor by described monitor signal photo detector (62), by measuring the variation of the monitor signal center wavelength of light of exporting, according to described temperature-wavelength scaling relation, determine to be carved with in the optical fiber (4) temperature of the fibre core at Bragg grating (41) position.
2. the measuring method of temperature of optical fiber core according to claim 1, it is characterized in that inscribing Bragg grating (41) with different centre wavelength in described fiber core diverse location many places, and utilize the monitor signal light of respective wavelength to monitor, with realization the temperature of corresponding fibre core position is monitored.
3. the measuring method of temperature of optical fiber core according to claim 1 is characterized in that described double-colored coupling mechanism is dichroic mirror or wavelength division multiplexer.
4. according to the measuring method of claim 1 or 2 or 3 each described temperature of optical fiber core, it is characterized in that described monitor signal photo detector (62) is a spectroanalysis instrument.
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| CN2010101017707A CN101762343B (en) | 2010-01-27 | 2010-01-27 | Method for measuring temperature of optical fiber core |
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| CN2010101017707A CN101762343B (en) | 2010-01-27 | 2010-01-27 | Method for measuring temperature of optical fiber core |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102261966B (en) * | 2011-04-26 | 2012-09-12 | 北京东方锐择科技有限公司 | Fluorescent optical fiber temperature measurement optical system |
| CN111952829B (en) * | 2020-08-22 | 2022-03-18 | 中国人民解放军国防科技大学 | Quasi-distributed measurement method for three-dimensional space temperature of optical fiber core |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581607A (en) * | 2003-11-06 | 2005-02-16 | 中国科学院长春光学精密机械与物理研究所 | Wavelength tunable dual-cladding-layer optical fiber laser |
| CN2804824Y (en) * | 2005-07-08 | 2006-08-09 | 深圳太辰光通信有限公司 | Optical fiber raster temp sensing and alarming device |
| CN101520346A (en) * | 2009-04-17 | 2009-09-02 | 电子科技大学 | Fiber bragg grating temperature detection system |
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- 2010-01-27 CN CN2010101017707A patent/CN101762343B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581607A (en) * | 2003-11-06 | 2005-02-16 | 中国科学院长春光学精密机械与物理研究所 | Wavelength tunable dual-cladding-layer optical fiber laser |
| CN2804824Y (en) * | 2005-07-08 | 2006-08-09 | 深圳太辰光通信有限公司 | Optical fiber raster temp sensing and alarming device |
| CN101520346A (en) * | 2009-04-17 | 2009-09-02 | 电子科技大学 | Fiber bragg grating temperature detection system |
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Inventor after: Zhou Jun Inventor after: Fan Yuanyuan Inventor after: He Bing Inventor before: He Bing Inventor before: Fan Yuanyuan Inventor before: Zhou Jun |
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Free format text: CORRECT: INVENTOR; FROM: HE BING FAN YUANYUAN ZHOU JUN TO: ZHOU JUN FAN YUANYUAN HE BING |
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