CN100418277C - Continuous running high-power multi-wavelength optical fiber light source based on ultra continuous spectrum - Google Patents
Continuous running high-power multi-wavelength optical fiber light source based on ultra continuous spectrum Download PDFInfo
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- CN100418277C CN100418277C CNB2005100135349A CN200510013534A CN100418277C CN 100418277 C CN100418277 C CN 100418277C CN B2005100135349 A CNB2005100135349 A CN B2005100135349A CN 200510013534 A CN200510013534 A CN 200510013534A CN 100418277 C CN100418277 C CN 100418277C
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Abstract
The present invention relates to an optical fiber source, in particular to an optical fiber source of high-power multi-wavelength output capable of realizing continuous operation on the basis of ultra continuous spectrum technology. At present, a plurality of methods are used for generating multi-wavelength light sources at home and abroad, but the methods have disadvantages. The present invention has the technical characteristics that the output light of a high-power continuous wave Raman optical fiber laser whose central wavelength is 1.24 mum is used as pumping light, and the pumping light enters an ultra continuous spectrum cavity which is in a nested structure and is composed of a common single-mode optical fiber and an optical fiber grating; under the action of nonlinear effects of optical fibers, such as Raman scattering, modulational instability, four-wave mixing, etc., the energy of the pumping light is converted into Stokes light of the next stage in the wave band of 1.31 mum, and the Stokes light is used as a center to be expanded into a wide-band continuous spectrum; the wide-band continuous spectrum is divided by an optical spectrum after being filtered to obtain a plurality of wavelengths of the wave band of 1.31 mum to be output. The present invention has the advantages of high output power, good time stability, normal operation at room temperature, good temperature stability, convenient integration, low cost, simple technology and easy realization of industrialization.
Description
Technical field
The present invention relates to a kind of optical fiber source, particularly realize the optical fiber source of the high power multi-wavelength output of running continuously based on the super continuous spectrums technology.
Background technology
The method that is used to now to produce multi wave length illuminating source both at home and abroad generally has following several: (1) is by approaching a plurality of distributed feed-back (the Distributed Feedback of wavelength, DFB) multi wave length illuminating source [the Sudoh T.K. of laser array formation, Nakano Y., et al., " Wavelength trimming technology for multiple wavelength distributed feedback laser arrays byphoto induced refractive index change ", Electron.Lett., 1997,33 (3): 216-217]; (2) method that adopts the selectivity feedback or add filter is carried out spectrum to the output of erbium doped fiber laser and is cut apart [Wysocki P.F.et al., " Characteristics of erbium-doped superfluorescent fiber sources for interferometric sensorapplications ", J.Lightwave Technol, 1994,12 (3): 550-567]; (3) super continuous spectrums that produces of paired pulses pumping carries out spectrum and cuts apart [Morioka, T., " Supercontinuum lightwave source for next generation opticalnetworks ", LEOS 2002,10-14Nov.2002, vol.1:117-118].Wherein method (1) is accurately controlled quite difficulty of output spectrum and lambda router channel spacing coupling because the Distributed Feedback Laser output wavelength changes with the waveguide effective refractive index, uses a plurality of Distributed Feedback Lasers to make cost too high simultaneously, complex process.Method (2) is though avoided using simultaneously the coupling of a plurality of lasers, and only there is the gain spectral of broad in erbium doped fiber laser at the 1550nm wave band, and temperature influence is very big, and normal temperature can't provide the output spectra of broad to carry out spectrum down to cut apart.Method (3) is though can remedy the deficiency of above-mentioned two methods, and the pumping source that adopts is a pulse laser, and multi-wavelength is exported with pulse mode work, and is difficult to obtain higher-wattage output.Therefore, all there is defective in this several method, is very limited in actual applications.
Summary of the invention
Purpose of the present invention: with lower cost, simple structure realizes that at 1.31 mu m wavebands full fiber type, power output are greater than the multi-wavelength output of turning round continuously of the high power of 1W.
Technology constitutes: the output light of high power CW ripple Raman optical fiber laser that with centre wavelength is 1.24 μ m is as pump light, enter the super continuous spectrums chamber of the nested structure that constitutes by general single mode fiber and fiber grating, under the effect of fiber nonlinear effects such as Raman scattering, modulational instability and four wave mixing, the Conversion of energy of pump light is the next stage stokes light that is positioned at 1.31 mu m wavebands, and be that center spread becomes wide ultra broadband continuous spectrum with it, continuous spectrum is cut apart by spectrum through behind the filter, thereby obtains a plurality of wavelength outputs of 1.31 mu m wavebands.
Concrete technical scheme of the present invention is:
Continuous running high-power multi-wavelength optical fiber light source based on super continuous spectrums, it comprises pumping source, raman optical fibre laserresonator, super continuous spectrums chamber, comb filter, the raman optical fibre laserresonator, it is the Raman chamber, comprise phosphorus silicon raman optical fibre, and second fiber grating and the 3rd fiber grating of the difference welding of the forward and backward two ends of phosphorus silicon raman optical fibre, constitute the Raman chamber of one pole, wherein second fiber grating is the total reflection grating, the 3rd fiber grating is the partial reflection grating, adopt pumping source that pumping is carried out in the Raman chamber, constitute single wavelength output Raman optical fiber laser; Nesting type structure is adopted in the super continuous spectrums chamber, comprise that successively first fiber grating, aforementioned Raman chamber, monomode fiber and the 4th fiber grating constitute jointly, first fiber grating is positioned at the input in Raman chamber, monomode fiber directly is welded on the output of Raman optical fiber laser, the 4th fiber grating is placed in the tail end of monomode fiber, wherein first fiber grating is the total reflection grating, the 4th fiber grating is the partial reflection grating, and first fiber grating and the 4th fiber grating constitute the reponse system in super continuous spectrums chamber; Comb filter is positioned at the output in super continuous spectrums chamber, and the spectrum of broadening is cut apart, and output is a plurality of wavelength of running continuously.
Beneficial effect of the present invention: novel multi wave length illuminating source has can export that a plurality of wavelength, power output height, time stability are good, at room temperature good, the fiberize degree height of operate as normal, temperature stability is convenient to integratedly at 1.31 mu m wavebands, and cost is low, technology simple, be easy to suitability for industrialized production.The outstanding characteristics of this multi wave length illuminating source are exactly to realize the multi-wavelength output of higher-wattage and running continuously at 1.31 mu m wavebands; Experimental provision has adopted unique nesting type structure, has fully utilized Raman gain optical fiber and the general single mode fiber gain media as wideband spectrum, effectively raises the length of gain media, thereby has further improved transformation efficiency; Experimental provision is simple, and used optical fiber is common single mode optical fibres, does not need special optical fiber; Total adopts fiber grating as reponse system, has realized full fiberize, helps integrated and in the coupling of optical fiber telecommunications system, greatly reduces coupling loss.Utilize this technology, can near dispersion zero-point (1.31 μ m communication window), realize the output of a plurality of wavelength, effectively avoid the influence of chromatic dispersion, need not use expensive special optical fibers such as dispersion compensation, satisfy optical communication system at these communication window requirements of one's work to multi-wavelength output.So, but this is a kind ofly to turn round, export average power height normal temperature operate as normal, low, the simple multi wave length illuminating source of technology of cost in a continuous manner at 1.31 mu m wavebands.
Description of drawings
Fig. 1 structural representation of the present invention
Fig. 2 four-wave mixing in fiber effect causes spectrum widening effect schematic diagram
Among the figure: 1. pumping source 2. first fiber gratings 3. second fiber gratings 4. phosphorus silicon raman optical fibres 5. the 3rd fiber grating 6. monomode fibers 7. the 4th fiber grating, 8. comb filter, 9. Raman chamber
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated:
Continuous running high-power multi-wavelength optical fiber light source based on super continuous spectrums, it comprises pumping source, the raman optical fibre laserresonator, the super continuous spectrums chamber, comb filter, it is characterized in that: the raman optical fibre laserresonator, it is Raman chamber 9, comprise phosphorus silicon raman optical fibre 4, and before the phosphorus silicon raman optical fibre 4, back two ends are second fiber grating 3 and the 3rd fiber grating 5 of welding respectively, constitute the Raman chamber 9 of one pole, wherein second fiber grating 3 is the total reflection grating, the 3rd fiber grating 5 is the partial reflection grating, adopt 1 pair of Raman chamber of pumping source 9 to carry out pumping, constitute single wavelength output Raman optical fiber laser; Nesting type structure is adopted in the super continuous spectrums chamber, comprise that successively first fiber grating 2, aforementioned Raman chamber 9, monomode fiber 6 and the 4th fiber grating 7 constitute jointly, first fiber grating 2 is positioned at the input in Raman chamber 9, monomode fiber 6 directly is welded on the output of Raman optical fiber laser, the 4th fiber grating 7 is placed in the tail end of monomode fiber 6, wherein first fiber grating 2 is the total reflection grating, the 4th fiber grating 7 is the partial reflection grating, and first fiber grating 2 and the 4th fiber grating 7 constitute the reponse system in super continuous spectrums chamber; Comb filter 8 is positioned at the output in super continuous spectrums chamber, and the spectrum of broadening is cut apart, and output is a plurality of wavelength of running continuously.
The centre wavelength of first fiber grating 2 is 1315nm.
The centre wavelength of second fiber grating 3 and the 3rd fiber grating 5 is 1245nm.
The centre wavelength of the 4th fiber grating 7 is 1315nm.
Pumping source is that output wavelength is the ytterbium-doped double-cladded-layer optical fiber laser of 1070nm or other laser that output wavelength is 1070nm.
This most outstanding advantage of multi-wavelength output that constitutes based on super continuous spectrums being carried out spectrum cut apart just has been to utilize the zero dispersion characteristics of monomode fiber at 1.31 mu m wavebands, the transformation efficiency of the various nonlinear effects in the optical fiber is improved greatly, thereby utilize lower cost, simple structure can obtain the ultra broadband spectrum of running continuously, and then obtain the continuous output of a plurality of wavelength.
The Physical Mechanism of this multi wave length illuminating source can be explained by the nonlinear effect in the optical fiber.At first, output wavelength is after laser that the pump light source 1 of 1070nm is sent enters phosphorus silicon optical fiber 4, utilizes that frequency shift amount is 1330cm in 4
-1The Raman scattering effect, and since the feedback effect of total reflection grating 3 and partial reflection grating 5 form high power laser light at 1245nm place and export.Then, the laser of 1245nm is subjected to wherein that frequency shift amount is the Raman scattering effect effect of 440cm-1 in phosphorus silicon optical fiber 4 and monomode fiber 6, be converted into the stokes light that wavelength is 1315nm, and obtain higher-wattage under 2 and 7 feedback effect.
After this, wavelength be the light of 1315nm in phosphorus silicon optical fiber 4 and monomode fiber 6 because fiber nonlinear effect is seted out living broadening.The nonlinear effect of Chan Shenging is a modulational instability at first, according to the non-linear Schrdinger equation in the optical fiber, when the light wave in the optical fiber is positioned at the anomalous dispersion district of optical fiber, can produce new spectral component in its both sides, gain maximum and former transmission light frequency difference are Ω
s=[2 γ P
pExp (α L)/| β
2|]
1/2For non linear coefficient γ is 0.47W
-1Km
-1, loss α is 0.36dB/km, abbe number β
2For-0.303pa
2The monomode fiber of/km, power are that 2W, wavelength are that the light wave of 1315nm will produce maximum gain at 1307.4nm and 1322.6nm place, promptly produce broadening in about 15nm scope.
Power four-wave mixing effect then occurs after increasing.To the four-wave mixing effect of degeneracy, frequency is ω
pLight wave in optical fiber, can produce and satisfy frequency match (2 ω simultaneously
p=ω
s+ ω
As) and phase matched (κ=(k
s+ k
As-2k
p)+2 γ P
p=0) two frequencies are ω
sAnd ω
AsNew light wave, and make spectrum widening.Because monomode fiber is in the zero dispersion characteristics of 1.31m wave band, phase-matching condition is easy to satisfy in very big wave-length coverage, and the efficient of spectrum widening is improved greatly.In aforementioned monomode fiber because the power that modulational instability produces is that 2W, centre wavelength are that 1315nm, width are the light wave of 15nm, can be in the scope from 1200nm to 1450nm new light wave, but promptly the spectrum broadening to (Fig. 2) more than the 100nm.Thus, light wave obtains broadening on a large scale.
At last, the light wave behind the broadening evenly is divided into many parts by comb filter 8 on spectrum, forms multi-wavelength output.
Claims (6)
1. continuous running high-power multi-wavelength optical fiber light source based on super continuous spectrums, it comprises pumping source, the raman optical fibre laserresonator, the super continuous spectrums chamber, comb filter, it is characterized in that: the raman optical fibre laserresonator, be Raman chamber (9), comprise phosphorus silicon raman optical fibre (4), and phosphorus silicon raman optical fibre (4) is preceding, back two ends are second fiber grating (3) and the 3rd fiber grating (5) of welding respectively, constitute the Raman chamber (9) of single-stage, wherein second fiber grating (3) is the total reflection grating, the 3rd fiber grating (5) is the partial reflection grating, adopt pumping source (1) that Raman chamber (9) are carried out pumping, constitute single wavelength output Raman optical fiber laser; Nesting type structure is adopted in the super continuous spectrums chamber, comprise first fiber grating (2) successively, aforementioned Raman chamber (9), monomode fiber (6) and the 4th fiber grating (7), first fiber grating (2) is positioned at the input of Raman chamber (9), monomode fiber (6) directly is welded on the output of Raman optical fiber laser, the 4th fiber grating (7) is placed in the tail end of monomode fiber (6), wherein first fiber grating (2) is the total reflection grating, the 4th fiber grating (7) is the partial reflection grating, and first fiber grating (2) and the 4th fiber grating (7) constitute the reponse system in super continuous spectrums chamber; Comb filter (8) is positioned at the output in super continuous spectrums chamber, and the spectrum of broadening is cut apart, and output is a plurality of wavelength of running continuously.
2. according to the said continuous running high-power multi-wavelength optical fiber light source based on super continuous spectrums of claim 1, it is characterized in that: the centre wavelength of first fiber grating (2) is 1315nm.
3. according to the said continuous running high-power multi-wavelength optical fiber light source based on super continuous spectrums of claim 1, it is characterized in that: the centre wavelength of second fiber grating (3) and the 3rd fiber grating (5) is 1245nm.
4. according to the said continuous running high-power multi-wavelength optical fiber light source based on super continuous spectrums of claim 1, it is characterized in that: the centre wavelength of the 4th fiber grating (7) is 1315nm.
5. according to the said continuous running high-power multi-wavelength optical fiber light source based on super continuous spectrums of claim 1, it is characterized in that: pumping source (1) is that output wavelength is the ytterbium-doped double-cladded-layer optical fiber laser of 1070nm or other laser that output wavelength is 1070nm.
6. according to the said continuous running high-power multi-wavelength optical fiber light source based on super continuous spectrums of claim 1, it is characterized in that: monomode fiber (6) is that the zero dispersion point is the general single mode fiber of 1310nm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801090A (en) * | 2012-08-13 | 2012-11-28 | 温州泛波激光有限公司 | Long-pulse fiber laser |
| CN108512020A (en) * | 2017-09-22 | 2018-09-07 | 中国人民解放军国防科技大学 | Incoherent super-continuum spectrum light source with controllable spectrum and tunable output power |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102480102A (en) * | 2010-11-22 | 2012-05-30 | 住友电气工业株式会社 | MOPA (master oscillator power amplifier) light source |
| CN102130413B (en) * | 2011-02-17 | 2012-03-28 | 浙江大学 | Full optical fiber type supercontinuum laser source based on multi-component-doped silica optical fiber |
| CN102338965B (en) * | 2011-08-24 | 2013-06-19 | 武汉邮电科学研究院 | Method for producing ultra-wide spectrum optical comb |
| FR3047119B1 (en) * | 2016-01-22 | 2018-03-02 | Centre National De La Recherche Scientifique - Cnrs - | DEVICE FOR GENERATING A POLYCHROMATIC PHOTON BEAM AND SUBSTANTIALLY CONSTANT ENERGY |
| CN106571580B (en) * | 2016-10-19 | 2019-03-01 | 电子科技大学 | A kind of mid-infrared fiber laser of wavelength wideband adjustable |
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| US5323404A (en) * | 1993-11-02 | 1994-06-21 | At&T Bell Laboratories | Optical fiber laser or amplifier including high reflectivity gratings |
| CN1540906A (en) * | 2003-10-30 | 2004-10-27 | 上海交通大学 | Multiple wavelength ultra continuous light sources |
| US20050024713A1 (en) * | 2003-07-29 | 2005-02-03 | Alcatel | Active optical fiber for raman amplification |
| CN1617037A (en) * | 2004-12-03 | 2005-05-18 | 清华大学 | Broadband envelope flat full optical fiber multiple wavelength Raman laser |
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2005
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5323404A (en) * | 1993-11-02 | 1994-06-21 | At&T Bell Laboratories | Optical fiber laser or amplifier including high reflectivity gratings |
| US20050024713A1 (en) * | 2003-07-29 | 2005-02-03 | Alcatel | Active optical fiber for raman amplification |
| CN1540906A (en) * | 2003-10-30 | 2004-10-27 | 上海交通大学 | Multiple wavelength ultra continuous light sources |
| CN1617037A (en) * | 2004-12-03 | 2005-05-18 | 清华大学 | Broadband envelope flat full optical fiber multiple wavelength Raman laser |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801090A (en) * | 2012-08-13 | 2012-11-28 | 温州泛波激光有限公司 | Long-pulse fiber laser |
| CN108512020A (en) * | 2017-09-22 | 2018-09-07 | 中国人民解放军国防科技大学 | Incoherent super-continuum spectrum light source with controllable spectrum and tunable output power |
| CN108512020B (en) * | 2017-09-22 | 2019-06-25 | 中国人民解放军国防科技大学 | Incoherent super-continuum spectrum light source with controllable spectrum and tunable output power |
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