CN101202415A - Double frequency optical fibre laser - Google Patents
Double frequency optical fibre laser Download PDFInfo
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- CN101202415A CN101202415A CNA2006101651132A CN200610165113A CN101202415A CN 101202415 A CN101202415 A CN 101202415A CN A2006101651132 A CNA2006101651132 A CN A2006101651132A CN 200610165113 A CN200610165113 A CN 200610165113A CN 101202415 A CN101202415 A CN 101202415A
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Abstract
The invention provides a dual-frequency fiber laser. The invention is characterized in that the invention comprises a pumping source which is used for pumping active fibers and implementing population reversion, an isolator with an input terminal which is connected with the input terminal of the pumping source and used for isolating the light which is back transmitted and stabilizing the output of the pumping source and protecting the pumping source, an active resonator with an input terminal which is connected with the output terminal of the isolator and used for providing optical feedback and selecting laser frequency, and a wavelength division multiplexer with an input terminal which is connected with the output terminal of the active resonator and used for distributing lasers with different frequencies to enter different passages.
Description
Technical field
The invention belongs to the fiber laser field, particularly can export the fiber laser of stablizing frequency difference.Be mainly used in interferometry and millimeter wave subcarrier optical communication system.
Background technology
Double-frequency optical fiber laser is in many technical fields, communicates by letter etc. that technical field has and important effect and always being paid close attention to by people as interferometry, optical sensing and millimeter wave optical fiber.Especially more and more higher in recent years to the required precision of measuring, and to the intensification based on the millimeter wave optical fiber Communication Studies of two-frequency laser, the two-frequency laser of narrow linewidth and high stable frequency difference becomes the focus of research gradually.
Compare with two frequency gas laser, double-frequency optical fiber laser can provide the frequency difference up to dozens or even hundreds of GHz, and the highest frequency difference that can only reach hundred MHz of two frequency gas laser; Compare with solid state laser, the live width of double-frequency optical fiber laser is very narrow has only tens or tens KHz; Gas, solid state laser complex structure are bulky in addition, and fiber laser is then small and exquisite flexibly by contrast.The double frequency erbium doped fiber laser can be divided into two big classes: the one, and utilize filtering mechanism to realize double frequency output [Park N, etal. " Multiple wavelength operation of anerbium-doped fiber laser ", IEEE Photon TechnolLett, 1992,4 (6): 540]; The 2nd, utilize fiber grating to provide feedback and selection wavelength to realize double frequency output [Sejka M, et al. " Distributed feedback Er-doped fiber laser ", Electron Lett, 1993,31 (17): 1445].The former places two single wavelength narrow band filters or dressing filter in the chamber, wideband light source is carried out filtering amplify the output of realization double frequency again.The latter adopts polyphone DBR fiber-grating laser, and the DFB fiber-grating laser adopts technology realization double frequency outputs such as σ an actor's rendering of an operatic tune fiber-grating laser.The narrow-band filtering method, polyphone DBR, DFB fiber-grating laser, the light wave of two frequencies of σ an actor's rendering of an operatic tune fiber-grating laser output is realized by different frequency-selecting devices, under extraneous environmental impact, the response of different frequency-selecting devices there are differences, and will influence the frequency difference stability of two-frequency laser.Adopt the dressing filter and method then will cause the output of multi-wavelength, need carry out filtering to output light, reduced the utilization ratio of pump light.
Summary of the invention
The present invention is directed to the weak point of said structure,, proposed a kind of have narrow linewidth, low noise, simple in structure, double-frequency optical fiber laser that frequency difference is stable from improving the frequency difference stability and the pumping source utilance of double-frequency laser.
Technical solution of the present invention is as follows:
A kind of double-frequency optical fiber laser of the present invention is characterized in that, comprising:
One pumping source is used for the pumping Active Optical Fiber, realizes population inversion;
One isolator, the input of this isolator is connected with the output of pumping source, is used to isolate the light of backpropagation, stablizes the output and the protection pumping source of pumping source;
One active resonant cavity, the input of this active resonant cavity is connected with the output of isolator, is used to provide bulk of optical feedback and selects laser frequency;
One wavelength division multiplexer, the input of this wavelength division multiplexer is connected with the output of active resonant cavity, is used to distribute the laser of different frequency to enter different passages.
Wherein said pumping source is the laser pumping source of 980nm.
Wherein said active resonant cavity by successively the polyphone be produced on big broadband grating, the doped fiber on the general single mode fiber and the grating that is produced on the polarization maintaining optical fibre is formed.
The wherein said grating reflection spectrum that is produced on the polarization maintaining optical fibre has two reflection peaks, and the polarization state of bimodal corresponding light wave is vertical mutually.
Outstanding advantage of the present invention:
The dual wavelength light wave frequency difference of the present invention's output is stable, and environment is insensitive to external world;
The laser of the present invention's output has line width, low noise advantages;
Of the present invention simple and reliable for structure, cost is low, is easy to promote.
Description of drawings
For further specifying concrete technology contents of the present invention, below in conjunction with embodiment and accompanying drawing describes in detail as after, wherein:
Fig. 1 is the structural representation of double-frequency optical fiber laser;
Fig. 2 is the spectrum schematic diagram of active resonant cavity frequency-selecting;
Fig. 3 is the grating reflection spectrum measured drawing that is produced on the polarization maintaining optical fibre;
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also shown in Figure 1ly, a kind of double-frequency optical fiber laser of the present invention is characterized in that, comprising:
One pumping source 1 is used for the pumping Active Optical Fiber, realizes population inversion, and this pumping source 1 is the laser pumping source of 980nm;
One isolator 2, the input of this isolator 2 is connected with the output of pumping source 1, is used to isolate the light of backpropagation, stablizes the output and the protection pumping source of pumping source;
One active resonant cavity 3, the input of this active resonant cavity 3 is connected with the output of isolating 2, be used to provide bulk of optical feedback and select laser frequency, described active resonant cavity 3 is made up of the grating 33 that is produced on big broadband grating 31, the doped fiber 32 on the general single mode fiber and is produced on the polarization maintaining optical fibre of contacting successively, the described reflectance spectrum that is produced on the grating 33 on the polarization maintaining optical fibre has two reflection peaks, and the polarization state of bimodal corresponding light wave is vertical mutually;
One wavelength division multiplexer 4, the input of this wavelength division multiplexer 4 is connected with the output of active resonant cavity 3, is used to distribute the laser of different frequency to enter different passages.
Double-frequency optical fiber laser as shown in Figure 1,980 semiconductor lasers produce the laser of 980nm as pumping source 1, earlier by isolator 2, then through being produced on the grating 31 on the general single mode fiber, enter doped fiber 32, excite dopant ion to make it be in high level and realize population inversion, therefore stimulated radiation absorbs greater than being excited, light is exaggerated during by doped fiber, when the grating 33 of the optical transmission of amplifying on being produced on polarization maintaining optical fibre, the frequency that satisfies Bragg's condition of reflection is ω and is that the light wave of center Δ ω in certain frequency is reflected with it, further being exaggerated through doped fiber once more, is ω but have only those to satisfy resonant cavity standing-wave condition frequency simultaneously
1, ω
2Light just can be exaggerated always and produce laser.Fig. 2 is the spectrum schematic diagram of active resonant cavity frequency-selecting, dotted line is the grating reflection spectrum that is produced on the general single mode fiber, heavy line is the reflectance spectrum that is produced on the polarization maintaining optical fibre, fine line satisfies the ω of grating Bragg's condition of reflection resonant cavity standing wave requirement simultaneously for satisfying the frequency that active resonant cavity standing-wave condition is selected
1, ω
2Just can swash ejaculation laser.In active resonant cavity, two reflection peaks that are produced on the grating 33 on the polarization maintaining optical fibre are arranged in the reflectance spectrum envelope of the grating 31 that is produced on the general single mode fiber.Fig. 3 is the grating reflection spectrum measured drawing that is produced on polarization maintaining optical fibre, and the wavelength of bimodal correspondence is respectively 1533.517nm, 1534.112nm, and whole grid region length is 1.2cm, reflectivity＞90%.Double-frequency laser is from being produced on the grating 33 ends output on the polarization maintaining optical fibre, and they are separated by wavelength division multiplexer 4, enter different passages.
The frequency difference of the double-frequency laser of the present invention's output has hyposensitivity to the disturbance of external environment.When variations in temperature, will cause thermal expansion effects and thermo-optic effect.For fiber grating, suppose that uniform pressure field and axial stress field keep constant, the grating cycle that is caused by thermal expansion effects is changed to: Δ Λ=α Λ Δ T, wherein α is a thermal coefficient of expansion.The effective refractive index that is caused by thermo-optic effect is changed to Δ n
e=ξ n
eΔ T, wherein ξ is a thermo-optical coeffecient, the temperature variant rate of change of expression refractive index.For the active resonant cavity that carries out frequency-selecting work simultaneously, its to temperature response sensitivity with optical fiber grating unanimity.
Active resonant cavity, its wavelength change can be represented with two parts:
Fiber grating (FBG), wavelength change is:
Wherein L is the length of active resonant cavity, and Λ is the template cycle, and Δ T is a temperature variation.The double frequency of output light depends on active resonant cavity and is produced on the bireflectance peak of the grating on the polarization maintaining optical fibre.Though the light wave of two different frequencies corresponding to the refractive index n difference owing to adopt same material, correspondence during variations in temperature
Identical, so the wavelength variable quantity of double frequency light wave is identical, frequency difference remains unchanged.
In the external force stepless action during in grating and active resonant cavity, wavelength variable quantity
Wherein k is a ga(u)ge factor, owing to adopt commaterial, corresponding k value is identical, so when external environment had disturbance, the light wave of the two-frequency laser of this structure output can keep stable frequency difference.In order to have reduced the phase noise of itself, total is adopted anti-sound in actual applications, the material package of damping effectively shields the influence of extraneous vibration to laser, has improved the stability and the wavelength stability of Output optical power.
The reasonably combined grating that is produced on the ordinary optic fibre in the design process of laser is produced on the length of polarization-maintaining fiber grating and doping grating, can realize under short size that the sharp of laser penetrate.Adopting grid region length is that 1.5cm is produced on the grating on the ordinary optic fibre, length is that high Er-doped fiber of 1.0cm and grid region length are that 1.2cm is produced on the active resonant cavity that the grating on the polarization maintaining optical fibre is formed, with 980 semiconductor lasers as pumping source, obtain output wavelength and be respectively 1533.536nm, 1534.124nm, the double-frequency laser of bandwidth＜50KHz.
Claims (4)
1. a double-frequency optical fiber laser is characterized in that, comprising:
One pumping source is used for the pumping Active Optical Fiber, realizes population inversion;
One isolator, the input of this isolator is connected with the output of pumping source, is used to isolate the light of backpropagation, stablizes the output and the protection pumping source of pumping source;
One active resonant cavity, the input of this active resonant cavity is connected with the output of isolator, is used to provide bulk of optical feedback and selects laser frequency;
One wavelength division multiplexer, the input of this wavelength division multiplexer is connected with the output of active resonant cavity, is used to distribute the laser of different frequency to enter different passages.
2. double-frequency optical fiber laser as claimed in claim 1 is characterized in that, wherein said pumping source is the laser pumping source of 980nm.
3. double-frequency optical fiber laser as claimed in claim 1 is characterized in that, wherein said active resonant cavity by successively the polyphone be produced on big broadband grating, the doped fiber on the general single mode fiber and the grating that is produced on the polarization maintaining optical fibre is formed.
4. double-frequency optical fiber laser as claimed in claim 1 is characterized in that, the wherein said grating reflection spectrum that is produced on the polarization maintaining optical fibre has two reflection peaks, and the polarization state of bimodal corresponding light wave is vertical mutually.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101651132A CN101202415A (en) | 2006-12-13 | 2006-12-13 | Double frequency optical fibre laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101651132A CN101202415A (en) | 2006-12-13 | 2006-12-13 | Double frequency optical fibre laser |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777722B (en) * | 2010-01-26 | 2011-08-31 | 天津理工大学 | Double-wavelength single-longitudinal-mode fiber laser and operating method thereof |
| CN102263357A (en) * | 2011-06-11 | 2011-11-30 | 佛山科学技术学院 | Double-frequency DFB (Distributed Feedback) fiber laser |
| CN103048305A (en) * | 2012-12-07 | 2013-04-17 | 中国科学院西安光学精密机械研究所 | All-fiber laser Raman testing device |
| CN103050870A (en) * | 2012-10-17 | 2013-04-17 | 北京工业大学 | Novel microchip laser supporting optical fiber output |
| CN114503003A (en) * | 2019-09-27 | 2022-05-13 | ams国际有限公司 | Optical device, photon detector, and method of manufacturing optical device |
-
2006
- 2006-12-13 CN CNA2006101651132A patent/CN101202415A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777722B (en) * | 2010-01-26 | 2011-08-31 | 天津理工大学 | Double-wavelength single-longitudinal-mode fiber laser and operating method thereof |
| CN102263357A (en) * | 2011-06-11 | 2011-11-30 | 佛山科学技术学院 | Double-frequency DFB (Distributed Feedback) fiber laser |
| CN103050870A (en) * | 2012-10-17 | 2013-04-17 | 北京工业大学 | Novel microchip laser supporting optical fiber output |
| CN103050870B (en) * | 2012-10-17 | 2015-07-15 | 北京工业大学 | Novel microchip laser supporting optical fiber output |
| CN103048305A (en) * | 2012-12-07 | 2013-04-17 | 中国科学院西安光学精密机械研究所 | All-fiber laser Raman testing device |
| CN114503003A (en) * | 2019-09-27 | 2022-05-13 | ams国际有限公司 | Optical device, photon detector, and method of manufacturing optical device |
| CN114503003B (en) * | 2019-09-27 | 2024-01-26 | ams国际有限公司 | Optical device, photon detector, and method of manufacturing optical device |
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