CN103022866A - Modulated oscillator power amplifier (MOPA) type random fiber optic laser device - Google Patents
Modulated oscillator power amplifier (MOPA) type random fiber optic laser device Download PDFInfo
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- CN103022866A CN103022866A CN2012105486731A CN201210548673A CN103022866A CN 103022866 A CN103022866 A CN 103022866A CN 2012105486731 A CN2012105486731 A CN 2012105486731A CN 201210548673 A CN201210548673 A CN 201210548673A CN 103022866 A CN103022866 A CN 103022866A
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Abstract
A modulated oscillator power amplifier (MOPA) type random fiber optic laser device belongs to a random fiber optic laser device system which uses optical fiber as a random laser gain medium. After pump light is coupled into the laser gain medium, Rayleigh backward scattering occurs in the optical fiber due to refractive index in-homogeneity of the optical fiber, and simultaneously the pump light provides gain to Rayleigh scattering light along the optical fiber, and therefore backward Rayleigh scattering light is amplified to form random lasers. The random fiber optic laser device system has the advantages that another short high-gain optical fiber is placed in front of the laser gain medium, and the backward Rayleigh scattering light continues to be amplified after being amplified by Raman. Accordingly, the random fiber optic laser device system is of an MOPA type random fiber optic laser device amplification structure, and furthermore the structure can improve output power of the random fiber optic laser device and reduce threshold power of the pump light. Additionally, the system can achieve double-pass amplification of the pump light, and improve the use ratio of the pump light.
Description
Technical field
The present invention relates to a kind of random fiber laser system.As the Random Laser gain media, master oscillator is comprised of pump light and Random Laser gain media with optical fiber in this system.After pump light was coupled into optical fiber, the rear amplification by Raman to Rayleigh scattering light that produces in optical fiber formed Random Laser, main oscillations process that Here it is.Amplifier is comprised of short high-gain optical fiber, can amplify Random Laser.Belong to new pattern laser device field.
Background technology
Sergei K. Turitsyn in the literature, Sergey A. Babin, Atalla E. El-Taher, Paul Harper, Dmitriy V. Churkin, Sergey I. Kablukov, Juan Diego Ania-Castanon, VassilisKaralekas and Evgenii V. Podivilov. Random distributed feedback fibre laser. Nature Photon.2010 introduces a kind of random fiber laser system among 4,231 – 235.In this system, the pump light of the 1455nm of two bundle equal power is from the midpoint of optical fiber coupled into optical fibres (total length of optical fiber is 83km) in opposite direction.The photon that transmits in optical fiber has formed distributed Rayleigh scattering (RS), and pump light provides distributed Raman gain along optical fiber simultaneously.Rear orientation light will be exaggerated and form laser from the two ends ejaculation of optical fiber, and the wavelength of shoot laser is 1550nm.This is the incoherent laser in a kind of space, in fields such as nonlinear optics, optical communication and sensings important application is arranged.
This Technology Need is improved to be:
1. power output has much room for improvement.Native system employing MOPA(master oscillation power amplification) the optical-fiber laser structure for amplifying of type amplifies Random Laser, can make the power output of random fiber laser greater than the 150mW in the document, thereby be applied in more areas.
2. the pump light threshold power is high.Native system can effectively amplify pump light and improve the utilance of pump light, thereby makes the threshold power of pump light be lower than 1.6W in the document.
3. conversion efficiency is low.The total slope efficiency of laser is 30% in the above-mentioned document, and native system can improve the slope efficiency of laser by amplifying pumping light power and MOPA type accidental laser structure.
Summary of the invention
Purpose of the present invention is exactly in order to improve the performance index of existing random fiber laser.Native system uses the optical-fiber laser structure for amplifying of MOPA type, and pump light and Random Laser are amplified simultaneously.And adopt residual pump light is returned the scheme that optical fiber amplifies distributed Rayleigh scattering light again.Can improve like this power output of accidental laser, the threshold power that the while can be reduced pump light, improve the utilance of pump light.
Basic thought of the present invention is as follows:
What the gain media of accidental laser used is optical fiber, can be optical fiber of monomode fiber, photonic crystal fiber, plastic fiber, doped fiber and other kinds etc.The inclined-plane is cut at the two ends of optical fiber in the experiment, enters fiber core to stop the Fresnel reflection that is caused by fiber end face.Pumping source can be various types of lasers.Because the refractive index of optical fiber is inhomogeneous, and light when propagating Rayleigh scattering can occur in optical fiber, backward rayleigh scattering coefficient is very little, is approximately ε=4.5 * 10-in gain medium
5Km
-1, therefore in optical fiber, backward Rayleigh scattering is negligible generally speaking.If but the optical fiber long enough will form laser after rear orientation light is exaggerated.For example: if the pump light wavelength is 1455nm, after distributed backward Rayleigh scattering light amplifies through Raman, about 1550nm, have maximum gain, be approximately 13THz with respect to the stokes frequency displacement of pump light, so the wavelength of the Random Laser of outgoing is approximately about 1550nm; If the pump light wavelength is 1455nm, distributed backward Rayleigh scattering light is through behind the Brillouin amplification, having maximum gain about 1455.1nm, is approximately to be 10GHz with respect to the stokes frequency displacement of pump light, so the wavelength of the Random Laser of outgoing is approximately about 1455.1nm.
The innovation of native system is to have put another kind of short high-gain optical fiber before gain medium, can be rear-earth-doped type optical fiber and photonic crystal fiber etc.After the backward Rayleigh scattering light that produces in the gain medium is amplified by Raman effect, can also in this gain fibre, continue amplification, thereby improve the power output of Random Laser.
And in order effectively to utilize pump light, the present invention has also adopted round trip to amplify scheme, be about to residual pump light and return in the gain media with the pump light mirror reflects, so pump light all forms amplification to the Rayleigh rear orientation light in the communication process of former and later two directions.Twice of pump light and even repeatedly pass through gain media is so that backward Rayleigh scattering light has improved the slope efficiency of magnification ratio and laser through repeatedly amplifying.This random fiber laser system has adopted the optical-fiber laser structure for amplifying of MOPA type, therefore not only can improve the power output of laser, reduces the pump light threshold power, can also effectively amplify pump light simultaneously, improves the utilance of pump light.
Technical scheme of the present invention is as follows:
Comprise lasing light emitter 1, the first coupler 2, the second coupler 3, the first optical fiber 4, the second optical fiber 5, the first optical isolator 6, the second optical isolator 7, the 3rd optical isolator 8, pump light speculum 9.Wherein:
Lasing light emitter 1(can be all kinds laser) as the pump light source of accidental laser, be coupled into the optical-fiber laser structure for amplifying that forms the MOPA type in the first optical fiber 4 by the first optical isolator 6 and the first coupler 2, the first optical fiber 4 is gain fibres, can be the optical fiber of photonic crystal fiber, rare-earth doped optical fibre or other kind.Pump light direct-coupling after amplifying in the first optical fiber 4 advances the second optical fiber 5.The second optical fiber 5 is Random Laser gain medias, can be the optical fiber of general single mode fiber, photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.The rear of generation forms laser after Rayleigh scattering light amplifies through Raman in the second optical fiber 5, and the frequency of Output of laser is the result after the pump light frequency produces the 13THz frequency displacement.Random Laser continues to amplify by the first optical fiber 4, thereby obtains higher power output.And in order to improve the pump light utilance, after residual pump light is reflected by pump light speculum 9, through the second coupler 3, be coupled in the second optical fiber 5, backward Rayleigh scattering light through twice in addition repeatedly amplify after, by the first optical fiber 4, the first coupler 2 and 8 outputs of the 3rd optical isolator, thereby obtain high-power Random Laser.The second optical isolator 7 is to enter in the optical fiber for the Fresnel reflection light that stops fiber end face to cause.After the second optical isolator 7 is arranged on the second coupler 3.Wherein the first coupler 2, the second coupler 3 can be wavelength division multiplexer, circulator or other optical passive components of satisfying the demand.
Further, the inclined-plane is cut at the second optical fiber 5 two ends.
Beneficial effect of the present invention mainly contains:
One, a kind of short high-gain optical fiber has been placed by this random fiber laser system before gain medium, namely adopted the random optical-fiber laser structure for amplifying of MOPA type, can effectively amplify pump light and Random Laser simultaneously like this, improve the power output of Random Laser, reduce the threshold power of pump light.
Two, native system is in order to improve the utilance of pump light, except with high gain medium optical fiber pump light being amplified, also residual pump light is returned in the gain medium with mirror reflects, twice of pump light and even repeatedly pass through gain medium, so that backward Rayleigh scattering light is repeatedly amplified, so native system can make the threshold power of laser be controlled at below the 1.6W, the power output of laser is more than 150mW.
Description of drawings
Fig. 1 is this programme invention technological system schematic diagram.
Among the figure: 1. lasing light emitter, 2. the first coupler, 3. the second coupler, 4. the first optical fiber, 5. the second optical fiber, 6. the first optical isolator, 7. the second optical isolator, 8. the 3rd optical isolator, 9. pump light speculum.
Embodiment
Example one: the short high-gain optical fiber of placing before the gain medium is rear-earth-doped type optical fiber.The upper level lifetime of this type optical fiber is longer, just can store large energy in excitation state with relatively low pump power, the spy is suitable for high power and amplifies, and has wider absorption band (800-1064nm) and excitation band (970-1200nm), and the selection of pumping source is more extensive.Pumping source at 976nm and 915nm very strong absworption peak arranged according to the ytterbium ion absorption spectrum, so can use the semiconductor laser of 976nm.Pump light direct-coupling after amplifying through Yb dosed optical fiber advances in the gain media, and that encourages in this medium amplifies through Raman afterwards to Rayleigh scattering light, namely produces the 13THz frequency displacement, forms Random Laser, and outgoing wave is about and is 1018.3nm so.This Random Laser continues to amplify by Yb dosed optical fiber at last, thereby obtains higher power output.
Example two: the short high-gain optical fiber of placing before the gain medium is photonic crystal fiber.Photonic crystal fiber is easily realized the numerical aperture that inner cladding is large, thereby improves the absorption efficiency to pump light.Simultaneously can also realize fibre core and the large ratio of inner cladding diameter, thereby reduce the oscillation threshold of laser.Adopt the semiconductor laser (LD) of 915nm as pumping source such as us.Pump light direct-coupling after amplifying through photonic crystal fiber advances in the gain medium, and that encourages in this medium amplifies through Raman afterwards to Rayleigh scattering light, namely produces the 13THz frequency displacement, forms Random Laser, and wavelength is about 951.3nm.This Random Laser continues to amplify by photonic crystal fiber at last, thereby obtains higher power output.
Be described in detail below in conjunction with the embodiment of accompanying drawing to system schema:
This programme is MOPA type random fiber laser system, system comprises lasing light emitter 1, the first coupler 2, the second coupler 3, the first optical fiber 4, the second optical fiber 5, the first optical isolator 6, the second optical isolator 7, the 3rd optical isolator 8, pump light speculum 9 referring to figure below.
Lasing light emitter 1(can be various types of lasers) as the pump light source of random fiber laser, be coupled in the first optical fiber 4 by the first optical isolator 6 and the first coupler 2, the first optical fiber 4 is for the short high-gain optical fiber that amplifies pump light and Random Laser, can be the optical fiber of photonic crystal fiber, rare-earth doped optical fibre or other kind.Pump light direct-coupling after amplifying in the first optical fiber 4 advances in the second optical fiber 5.The second optical fiber 5 is gain medias of random fiber laser, can be the optical fiber of monomode fiber, photonic crystal fiber, highly nonlinear optical fiber, plastic fiber, rare-earth doped optical fibre or other kind.The inclined-plane is cut at the second optical fiber 5 two ends, enters fiber core with the Fresnel reflection light that stops the pump light that is caused by fiber end face.Rear the amplification through Raman to Rayleigh scattering light in the second optical fiber 5 forms Random Laser, and the frequency of Random Laser has the 13THz frequency displacement with respect to the pumping light frequency.Random Laser can continue to amplify in the first optical fiber 4, obtains higher power output.In order to improve the pump light utilance, residual pump light, is coupled in the second optical fiber 5 through the second coupler 3 by 9 reflections of pump light speculum simultaneously.In the second optical fiber 5, produce rear to Rayleigh scattering light through twice in addition repeatedly amplify after, by the first optical fiber 4, the first coupler 2 and 8 outputs of the 3rd optical isolator, thereby obtain high-power Random Laser.The second optical isolator 7 is to enter in the optical fiber for the reverberation that stops fiber end face to cause.
When light transmitted in optical fiber, because the inhomogeneous generation coherent scattering of refractive index of fiber medium has formed distributed Rayleigh scattering (RS), most scattered photon let out from fiber cores, only has the backscattered photons of minority along Optical Fiber Transmission.Pump light has produced distributed gain in optical fiber.If the overall gain of rear orientation light is during greater than total losses, backward scattered photon just is exaggerated the formation Random Laser.The frequency of shoot laser is relevant with the amplification type, if Raman amplifies, the frequency of the Random Laser of generation is the result that the pumping light frequency moves down 13THz.
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, in the present invention without the essence of disclosure and any modification in the basic principle scope/variation or imitate conversion all to belong to claim protection range of the present invention.
Claims (5)
1..MOPA the type random fiber laser is characterized in that: comprise lasing light emitter (1), the first coupler (2), the second coupler (3), the first optical fiber (4), the second optical fiber (5), the first optical isolator (6), the second optical isolator (7), the 3rd optical isolator (8), pump light speculum (9);
Lasing light emitter (1) is coupled in the first optical fiber (4) by the first optical isolator (6) and the first coupler (2) as the pump light source of random fiber laser, and the first optical fiber (4) is for the gain fibre that amplifies pump light and Random Laser; Pump light direct-coupling after amplifying in the first optical fiber (4) advances in the second optical fiber (5); The second optical fiber (5) is the gain media of random fiber laser; The backward Rayleigh scattering light that excitation produces in the second optical fiber (5) produces Random Laser after amplifying; Random Laser is by the first optical fiber (4), the first coupler (2) and the 3rd optical isolator (8) output; Residual pump light, is coupled in the second optical fiber (5) through the second coupler (3) by pump light speculum (9) reflection; The backward Rayleigh scattering light that in the second optical fiber (5), produces through twice in addition repeatedly amplify after, by the first optical fiber (4), the first coupler (2) and the 3rd optical isolator (8) output; Thereby, obtain Random Laser; For after the reverberation that stops fiber end face to cause enters the second optical isolator (7) in the optical fiber and is arranged on the second coupler (3).
2. .MOPA type random fiber laser according to claim 1 is characterized in that:
Described the first optical fiber (4) is photonic crystal fiber or rare-earth doped optical fibre.
3. .MOPA type random fiber laser according to claim 1, it is characterized in that: described the second optical fiber (5) is monomode fiber, photonic crystal fiber, highly nonlinear optical fiber, plastic fiber or rare-earth doped optical fibre.
4. .MOPA type random fiber laser according to claim 1, it is characterized in that: described the first coupler (2), the second coupler (3) are wavelength division multiplexer or circulator.
5. .MOPA type random fiber laser according to claim 1, it is characterized in that: the inclined-plane is cut at the second optical fiber (5) two ends.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427801A (en) * | 2013-08-30 | 2013-12-04 | 太原理工大学 | Method and device for generating true random code on basis of backward rayleigh scattering |
| CN103453989A (en) * | 2013-09-22 | 2013-12-18 | 天津市德力电子仪器有限公司 | Grating spectrometer optical path structure for optical fiber communication |
| CN104191087A (en) * | 2014-09-26 | 2014-12-10 | 深圳市杰普特电子技术有限公司 | Processing method by adopting MOPA fiber laser device |
| CN105244739A (en) * | 2015-10-22 | 2016-01-13 | 重庆大学 | Ultra-narrow linewidth optical fiber laser |
| CN107154575A (en) * | 2017-06-27 | 2017-09-12 | 中国科学院半导体研究所 | Fiber amplifier |
| CN107768973A (en) * | 2017-11-14 | 2018-03-06 | 电子科技大学 | It is a kind of can precision tuning Brillouin's multi-wavelength optical fiber laser |
| CN112344971A (en) * | 2020-11-03 | 2021-02-09 | 江苏中天科技股份有限公司 | Long-distance sensing system based on super-continuum spectrum optical fiber |
| WO2023217131A1 (en) * | 2022-05-10 | 2023-11-16 | 华为技术有限公司 | Optical amplifier, optical amplification method, and fiber-optic communication system |
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| CN102354900A (en) * | 2011-11-09 | 2012-02-15 | 中国计量学院 | Random-distribution feedback optical fiber laser |
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| CN102354900A (en) * | 2011-11-09 | 2012-02-15 | 中国计量学院 | Random-distribution feedback optical fiber laser |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427801B (en) * | 2013-08-30 | 2016-01-13 | 太原理工大学 | A kind of method and device producing real random code based on backward Rayleigh scattering |
| CN103427801A (en) * | 2013-08-30 | 2013-12-04 | 太原理工大学 | Method and device for generating true random code on basis of backward rayleigh scattering |
| CN103453989A (en) * | 2013-09-22 | 2013-12-18 | 天津市德力电子仪器有限公司 | Grating spectrometer optical path structure for optical fiber communication |
| CN103453989B (en) * | 2013-09-22 | 2015-05-27 | 天津市德力电子仪器有限公司 | Grating spectrometer optical path structure for optical fiber communication |
| CN104191087A (en) * | 2014-09-26 | 2014-12-10 | 深圳市杰普特电子技术有限公司 | Processing method by adopting MOPA fiber laser device |
| CN104191087B (en) * | 2014-09-26 | 2017-11-24 | 深圳市杰普特光电股份有限公司 | A kind of processing method using MOPA optical fiber lasers |
| CN105244739B (en) * | 2015-10-22 | 2018-01-12 | 重庆大学 | Super-narrow line width optical fiber laser |
| CN105244739A (en) * | 2015-10-22 | 2016-01-13 | 重庆大学 | Ultra-narrow linewidth optical fiber laser |
| CN107154575A (en) * | 2017-06-27 | 2017-09-12 | 中国科学院半导体研究所 | Fiber amplifier |
| CN107768973A (en) * | 2017-11-14 | 2018-03-06 | 电子科技大学 | It is a kind of can precision tuning Brillouin's multi-wavelength optical fiber laser |
| CN112344971A (en) * | 2020-11-03 | 2021-02-09 | 江苏中天科技股份有限公司 | Long-distance sensing system based on super-continuum spectrum optical fiber |
| CN112344971B (en) * | 2020-11-03 | 2022-06-21 | 江苏中天科技股份有限公司 | Long-distance sensing system based on super-continuum spectrum optical fiber |
| WO2023217131A1 (en) * | 2022-05-10 | 2023-11-16 | 华为技术有限公司 | Optical amplifier, optical amplification method, and fiber-optic communication system |
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Application publication date: 20130403 |