CN102231476B - Random fiber laser of semiconductor laser cascaded pump - Google Patents
Random fiber laser of semiconductor laser cascaded pump Download PDFInfo
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- CN102231476B CN102231476B CN201110131331A CN201110131331A CN102231476B CN 102231476 B CN102231476 B CN 102231476B CN 201110131331 A CN201110131331 A CN 201110131331A CN 201110131331 A CN201110131331 A CN 201110131331A CN 102231476 B CN102231476 B CN 102231476B
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Abstract
The invention provides a random fiber laser system and belongs to the novel laser device field. In the system, a traditional single-mode fiber is taken as a laser medium, and a cascaded semiconductor laser is taken as pump light which is coupled to the fiber along an opposite direction from a middle point of the fiber. Photon is in propagation in the fiber, scattering is generated because of nonuniform random refractive index, and distributed Rayleigh scattering is formed. The pump light provides distributed Raman gain along the fiber. When total gain is greater than total loss, backward scattered photon is amplified to generate laser. Frequency of random laser is a result of frequency of last grade pump light shifting downward with 13 THz. By properly selecting pump light, output of the random laser in a whole fiber transparent window is realized. By using cascaded semiconductor laser as the pump light, not only is Raman gain spectrum bandwidth increased, but also Raman gain form is controlled. Thereby the random laser in the invention has the characteristics of controllable mode, super-long transmission, low threshold, high output power and the like.
Description
Technical field
The present invention relates to a kind of distributed Rayleigh scattering in optical fiber forms laser after Raman amplifies system.This system compares with traditional fiber laser does not have the chamber mirror.Belong to new pattern laser device field.
Background technology
Sergei K.Turitsyn in document, Sergey A.Babin, Atalla E.E1-Taher; PaulHarper, Dmitriy V.Churkin, Sergey I.Kablukov; Juan Diego Ania-Castanon; Vassilis Karalekas and Evgenii V.Podivilov.Random distributed feedbackfibre laser.Nature Photon.2010,4, introduce a kind of fiber ring laser system at random among the 231-235.The pump light of the 1455nm of two bundle constant powers is from from the midpoint of optical fiber coupled into optical fibres (total length of optical fiber is 83km) in opposite direction in this system.The photon that in optical fiber, transmits is because the inhomogeneous generation coherent scattering of refractive index has formed distributed Rayleigh scattering (RS), and most scattered photon lets out from fiber cores.Has only the backward scattered photon of minority along Optical Fiber Transmission.Pump light provides distributed Raman gain along optical fiber.If overall gain during greater than total losses backward scattered photon be exaggerated, so laser penetrates from the two ends of optical fiber, the wavelength of shoot laser is 1550nm.
This technological problem and shortage is:
1. threshold value problem.Need the threshold value of laser higher in the said system, reach 1.6W, high like this threshold value, too high to the power requirement of pump light, realize difficulty, so the reduction threshold value of must trying every possible means.
2. output power of laser awaits further to improve.Although power output has reached 150mW, in plurality of applications, still can't satisfy higher power demand, improve the transmission range that power also can increase light, increase the length of laser, satisfy the needs of communications applications middle and long distance transmission.
3. cost is higher.What use in the experiment is Raman fiber lasers, relatively more expensive.Need reduce cost in the practical application.
Summary of the invention
The object of the invention is exactly in order to overcome the deficiency of above-mentioned fiber laser at random; Proposed with cascaded semiconductor laser as pump light; Can increase the raman gain spectrum bandwidth on the one hand, and the raman gain spectrum line style is controlled, reduce laser threshold; Increase laser output power, can reduce cost on the other hand.
Basic thought of the present invention is following:
Laser medium is that (length is about 100km for traditional monomode fiber.The inclined-plane is cut at the two ends of optical fiber in experiment; To stop the reflection that causes by profile of optic fibre to get into fibre core), near the 1550nm transparency window of silicon glass fiber, determine by RS in this wavelength attenuation; Backscattering coefficient is very little, is approximately ε=4.5 * 10
-5Km
-1, therefore in the long passive fiber of 100km, the back is negligible to the RS scattering radiation.Yet when scattering radiation is exaggerated theatrical variation will take place.Amplify at first is to get into optical fiber and realize through be coupled the in the opposite direction pump light of two bundle equal power of the midpoint from optical fiber.If the pump light of 1455nm, maximum gain should be about 1550nm, is about 13THz (the concrete relating to parameters of this value and optical fiber) with respect to the Stokes frequency displacement of pump light, and the wavelength of shoot laser approximately is about 1550nm.In order to increase Raman gain spectral bandwidth; Can use the two-stage cascade semiconductor laser as pump light; Be that the semiconductor pumped light frequency in the second level moves down about 13THz than the semiconductor pumped light frequency of the first order; Like this, accidental laser output light frequency moves down 13THz equally than second level pumping light frequency.In order to control the line style of raman gain spectrum; As make the raman gain spectrum flat-top; Can a plurality of semiconductor lasers of cascade as pump light; The frequency ratio upper level frequency of each level semiconductor laser moves down 13THz, and the frequency of the Random Laser of output is that afterbody pumping light frequency moves down the later result of 13THz.Because in our scheme is two directional pump, so laser penetrates from the two ends of optical fiber.As pumping laser, both can increase the raman gain spectrum bandwidth through cascaded semiconductor laser, can control the raman gain spectrum line style again.Reduce the threshold value that laser produces, increase laser output power, also can effectively increase the distance of weak scattering light amplification and the length of laser simultaneously.Power and whole that cascaded semiconductor laser can also reduce the separate unit semiconductor laser be the cost of fiber laser at random.
Technical scheme of the present invention is following:
The fiber ring laser system at random of semiconductor laser cascade pumping is characterized in that: comprise first semiconductor laser 1, second semiconductor laser 2, the 3rd semiconductor laser 3, the 4th semiconductor laser 4, the 5th semiconductor laser cascaded series 5, the 6th semiconductor laser cascaded series 6, first coupler 7, second coupler 8, the 3rd coupler 9, the 4th coupler 10, the 5th coupler group 11, the 6th coupler group 12, the first single mode long optical fibers 13, the second single mode long optical fibers 14; Wherein:
Use the cascade pump light of two-way travel in opposite directions: left road first order pump light is made up of first semiconductor laser 1 and first coupler 7; Second level pump light is made up of second semiconductor laser 2 and second coupler 8, and other pump lights at different levels are made up of the 5th semiconductor laser group 5 and the 5th coupler group 11; The frequency ratio first order pump light frequency of second level pump light moves down 13THz, and the frequency ratio second level pump light frequency of third level pump light moves down 13THz, and multistage pumping light frequency moves by that analogy; Right wing first order pump light is made up of the 3rd semiconductor laser 4 and the 3rd coupler 10; Second level pump light is made up of the 4th semiconductor laser 3 and the 4th coupler 9, and other pump lights at different levels are made up of the 6th semiconductor laser group 6 and the 6th coupler group 12; The frequency ratio first order pump light frequency of second level pump light moves down 13THz, and the frequency ratio second level pump light frequency of third level pump light moves down 13THz, and multistage pumping light frequency moves by that analogy; Laser medium is the first single mode long optical fibers 13 and the second single mode long optical fibers 14.
Semiconductor cascade pump light gets into first monomode fiber 14 by the midpoint of optical fiber.Be distributed in the fiber laser at random of the rayleigh distributed formula scattered light two-way output of formation after the Raman gain that a plurality of semiconductor cascade pump lights produce amplifies in first monomode fiber 13 and second monomode fiber 14, the frequency of output laser is that afterbody pumping light frequency moves down 13THz.
The frequency of the frequency ratio previous stage of described each grade of multilevel semiconductor cascaded laser moves down 13THz, can in optical fiber, form the Raman gain with certain line style like this, can control the shape of raman gain spectrum through the control pump light.
The present invention adopts many semiconductor lasers that frequency differs 13THz as the cascade pump light, and the distributed Raman gain that in optical fiber, produces has amplified the distributed Rayleigh scattering light in the optical fiber and formed Random Laser.
Beneficial effect of the present invention mainly contains:
One, native system adopts cascaded semiconductor laser as pump light; Both can increase raman gain bandwidth; Can control and cutting the line style of raman gain bandwidth again; The threshold value that can control the laser generation is under 1.6W, and output power of laser has advantages such as pattern is controlled, overlength transmission, low threshold value, high-output power greater than 150mW.
Two, the semiconductor laser of native system cascade is cheap, and six groups of semiconductor laser prices of cascade can reduce by 50% than former laser, can reduce the cost of whole accidental laser.
Description of drawings
Fig. 1 is an invention technological system schematic diagram.
Among the figure: 1. first semiconductor laser, 2. second semiconductor laser, 3. the 3rd semiconductor laser, 4. the 4th semiconductor laser; 5. the 5th semiconductor laser cascaded series, 6. the 6th semiconductor laser cascaded series, 7. first coupler, 8. second coupler; 9. the 3rd coupler, 10. the 4th coupler, 11. the 5th coupler groups; 12. the 6th coupler group, 13. first single mode long optical fibers, 14. second single mode long optical fibers.
Embodiment
Embodiment below in conjunction with 1 pair of system of accompanying drawing is carried out detailed description: the fiber ring laser system at random of the based semiconductor laser cascade pumping among the present invention, system diagram be referring to figure one, 1. first semiconductor laser, 2. second semiconductor laser; 3. the 3rd semiconductor laser, 4. the 4th semiconductor laser, 5. the 5th semiconductor laser cascaded series; 6. the 6th semiconductor laser cascaded series, 7. first coupler, 8. second coupler; 9. the 3rd coupler, 10. the 4th coupler, 11. the 5th coupler groups; 12. the 6th coupler group, 13. first single mode long optical fibers, 14. second single mode long optical fibers.
Laser medium is that (total length is about 100km for the traditional first single mode long optical fibers 13 and the second single mode long optical fibers 14.The inclined-plane is cut at the two ends of optical fiber in experiment, gets into fibre core to stop the reflection that is caused by profile of optic fibre).
Use the cascade pump light of two-way travel in opposite directions: left road first order pump light is made up of first semiconductor laser 1 and first coupler 7; Second level pump light is made up of second semiconductor laser 2 and second coupler 8, and third level pump light is made up of the 5th semiconductor laser group 5 and the 5th coupler group 11.The frequency ratio first order pump light frequency of second level pump light moves down about 13THz, and the frequency ratio second level pump light frequency of third level pump light moves down about 13THz, and the frequency shifts of third level pump light by that analogy; Right wing first order pump light is made up of the 4th semiconductor laser 4 and the 4th coupler 10, and second level pump light is made up of the 3rd semiconductor laser 3 and the 3rd coupler 9, and third level pump light is made up of the 6th semiconductor laser group 6 and the 6th coupler group 12.The frequency ratio first order pump light frequency of second level pump light moves down about 13THz, and the frequency ratio second level pump light frequency of third level pump light moves down about 13THz, and the frequency shifts of third level pump light by that analogy.
The photon that in optical fiber, transmits is because the inhomogeneous generation coherent scattering of refractive index has formed distributed Rayleigh scattering (RS), and most scattered photon lets out from fiber cores.Has only the backward scattered photon of minority along Optical Fiber Transmission.The two-way pump light has produced distributed Raman gain in optical fiber.If overall gain during greater than total losses backward scattered photon be exaggerated, so Random Laser penetrates from the two ends of optical fiber, the frequency of shoot laser is that afterbody pumping light frequency moves down 13THz.Suitably select the pumping light frequency, can be so that Random Laser realizes output at whole optical fiber transparency window.
Above-mentioned instantiation has been described in realization in order to demonstrate the invention.But other variations of the present invention and modification it will be apparent to those skilled in the art that, do not have the essence and any modification/variation in the basic principle scope of disclosure or imitate conversion all to belong to claim protection range of the present invention in the present invention.
Claims (1)
1. the fiber ring laser system at random of semiconductor laser cascade pumping is characterized in that: comprise first semiconductor laser (1), second semiconductor laser (2), the 3rd semiconductor laser (3), the 4th semiconductor laser (4), the 5th semiconductor laser cascaded series (5), the 6th semiconductor laser cascaded series (6), first coupler (7), second coupler (8), the 3rd coupler (9), the 4th coupler (10), the 5th coupler group (11), the 6th coupler group (12), the first single mode long optical fibers (13) and the second single mode long optical fibers (14); Wherein:
Use the cascade pump light of two-way travel in opposite directions: left road first order pump light is made up of first semiconductor laser (1) and first coupler (7); Second level pump light is made up of second semiconductor laser (2) and second coupler (8), and other pump lights at different levels are made up of the 5th semiconductor laser group (5) and the 5th coupler group (11); The frequency ratio first order pump light frequency of second level pump light moves down 13THz, and the frequency ratio second level pump light frequency of third level pump light moves down 13THz, and multistage pumping light frequency moves by that analogy; Right wing first order pump light is made up of the 3rd semiconductor laser (4) and the 3rd coupler (10); Second level pump light is made up of the 4th semiconductor laser (3) and the 4th coupler (9), and other pump lights at different levels are made up of the 6th semiconductor laser group (6) and the 6th coupler group (12); The frequency ratio first order pump light frequency of second level pump light moves down 13THz, and the frequency ratio second level pump light frequency of third level pump light moves down 13THz, and multistage pumping light frequency moves by that analogy; Laser medium is the first single mode long optical fibers (13) and the second single mode long optical fibers (14).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110131331A CN102231476B (en) | 2011-05-20 | 2011-05-20 | Random fiber laser of semiconductor laser cascaded pump |
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| CN201110131331A CN102231476B (en) | 2011-05-20 | 2011-05-20 | Random fiber laser of semiconductor laser cascaded pump |
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| CN102231476B true CN102231476B (en) | 2012-08-29 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354900B (en) * | 2011-11-09 | 2012-12-26 | 中国计量学院 | Random-distribution feedback optical fiber laser |
| CN102437500B (en) * | 2011-12-02 | 2013-03-13 | 北京化工大学 | Random fiber laser with tunable wavelength |
| CN103376120B (en) * | 2012-04-16 | 2016-04-06 | 电子科技大学 | A kind of long distance point type sensor-based system based on optical fiber random laser |
| CN103378538A (en) * | 2012-04-17 | 2013-10-30 | 电子科技大学 | Semi-open cavity random fiber laser with low threshold |
| CN104600549B (en) * | 2015-02-09 | 2017-06-23 | 电子科技大学 | A kind of controllable coherent feedback optical fiber random laser device of pattern |
| CN104701716A (en) * | 2015-03-20 | 2015-06-10 | 中国计量学院 | Multiple wavelength random optical fiber laser based on fully open cavity |
| CN106602395A (en) * | 2017-01-19 | 2017-04-26 | 中国人民解放军国防科学技术大学 | Ultra-wideband random fiber laser based on multi-wavelength pumping |
| CN107425406B (en) * | 2017-07-18 | 2023-08-18 | 无锡科技职业学院 | Pump source of third-order Raman amplifier |
| CN107271027B (en) * | 2017-08-07 | 2020-05-12 | 电子科技大学 | Optical fiber sound wave sensing system based on broadband weak reflecting mirror and random laser |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499615A (en) * | 2009-02-24 | 2009-08-05 | 福州高意通讯有限公司 | High power semiconductor pump laser and amplifier |
| CN201417320Y (en) * | 2009-06-05 | 2010-03-03 | 深圳朗光科技有限公司 | Optical fiber end surface pump combiner |
| CN201656240U (en) * | 2010-03-26 | 2010-11-24 | 深圳朗光科技有限公司 | Fiber pump combiner |
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| US6480326B2 (en) * | 2000-07-10 | 2002-11-12 | Mpb Technologies Inc. | Cascaded pumping system and method for producing distributed Raman amplification in optical fiber telecommunication systems |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499615A (en) * | 2009-02-24 | 2009-08-05 | 福州高意通讯有限公司 | High power semiconductor pump laser and amplifier |
| CN201417320Y (en) * | 2009-06-05 | 2010-03-03 | 深圳朗光科技有限公司 | Optical fiber end surface pump combiner |
| CN201656240U (en) * | 2010-03-26 | 2010-11-24 | 深圳朗光科技有限公司 | Fiber pump combiner |
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