CN102208736A - Tunable multi-wavelength fiber laser - Google Patents
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- CN102208736A CN102208736A CN 201110098375 CN201110098375A CN102208736A CN 102208736 A CN102208736 A CN 102208736A CN 201110098375 CN201110098375 CN 201110098375 CN 201110098375 A CN201110098375 A CN 201110098375A CN 102208736 A CN102208736 A CN 102208736A
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- 239000000835 fiber Substances 0.000 title claims abstract description 53
- 230000003287 optical effect Effects 0.000 claims abstract description 97
- 239000000919 ceramic Substances 0.000 claims abstract description 31
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 11
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims description 21
- 230000007246 mechanism Effects 0.000 claims description 13
- 230000000737 periodic effect Effects 0.000 claims description 9
- 238000005086 pumping Methods 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract 1
- 229910052691 Erbium Inorganic materials 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000002269 spontaneous effect Effects 0.000 description 5
- 230000005283 ground state Effects 0.000 description 4
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- 238000010168 coupling process Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000001795 light effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 1
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Abstract
The invention provides a tunable multi-wavelength fiber laser based on piezoelectric ceramics, which overcomes the defect that the conventional laser outputs fixed single wavelength. The tunable multi-wavelength fiber laser comprises a pumping light source, a gain medium and an annular cavity, wherein a Wavelength Division Multiplexer (WDM), a rare earth fiber, a first optical isolator, an optical coupler, a tunable multi-wavelength generating unit and a second optical isolator are sequentially arranged in series in the annular cavity; the output end of the second optical isolator is connected with one input end of the wavelength division multiplexer, and the pumping light source is connected with the other input end of the wavelength division multiplexer; one output end of the optical coupler is connected with the input end of the tunable multi-wavelength generating unit, and the other output end of the optical coupler is used for outputting laser. The laser can provide required light sources for a plurality of channels simultaneously, so that the design of the transmitting end is more compact and economical.
Description
Technical field
The present invention relates to a kind of tunable multi-wavelength fiber laser, especially a kind of tunable multi-wavelength fiber laser based on piezoelectric ceramic.
Background technology
Fiber laser grows up on the doped optical fibre amplifier technical foundation.The waveguide type structure of fiber laser and can hold high light pumping characteristic, make that it has that power output height, good beam quality, conversion efficiency height, threshold value are low, line width, output wavelength are many, compatibility reaches plurality of advantages such as simple in structure well, in fields such as optical fiber communication, Fibre Optical Sensor, military affairs, industrial processes, optical information processing and panchromatic demonstrations wide application prospect are arranged.Particularly tunable optical fiber laser is being played the part of extremely important role in division multiplex fibre-optic communication wave and fiber optic sensing applications.
Communication at present mainly is semiconductor laser with laser, and its output wavelength is a fixed single.Along with the continuous development of optical fiber telecommunications system, modern optical fiber wavelength division multiplexing communications systems just develops towards the increasing direction of channel number.It is exactly to adopt the laser of a plurality of fixed wave length that the most direct method of multiple signals is provided.But there are following two significant disadvantages in this method:
1. along with the development of dense wave division multipurpose (DWDM) technology, the number of wavelengths in the system has reached tens of even up to a hundred.Provide the occasion of protection for needs, the backup of each wavelength must be provided by the laser of identical output wavelength, has caused the increase of backup number of lasers like this, and cost rises.
2. because laser with fixed wavelength need be distinguished with wavelength, the quantity of laser and classification constantly increase along with the increase of number of wavelengths.If dynamic wavelength distributes in the support optical-fiber network, improve network more flexible, then need to be equipped with the laser with fixed wavelength of a large amount of different wave lengths, thereby the reduction of the utilization rate of each laser, cause the wasting of resources.
Summary of the invention
The invention provides a kind of tunable multi-wavelength fiber laser based on piezoelectric ceramic, it has solved the shortcoming of the fixing single wavelength of existing laser output.
Technical solution of the present invention is:
This tunable multi-wavelength fiber laser comprises pump light source, gain media and annular chamber.Described gain media is the optical fiber of doped rare earth element; Connect successively in the described annular chamber and be provided with wavelength division multiplexer (WDM), rare earth doped fiber, first optical isolator, optical coupler, tunable multi-wavelength generation unit, second optical isolator; The output of described second optical isolator is connected with an input of wavelength division multiplexer, and pump light source is connected with another input of wavelength division multiplexer; An output of described optical coupler is connected with the input of tunable multi-wavelength generation unit, and another output of optical coupler is used for laser output.
Above-mentioned tunable multi-wavelength generation unit comprises optical branching device, at least two optical circulators, Fiber Bragg Grating FBG (FBG), the optical coupler identical with optical circulator quantity and the periodic adjustment mechanisms that are used to regulate the FBG cycle; An output of optical coupler is connected with optical branching device one end, the optical branching device other end is connected with first port of two optical circulators at least, second port of each optical circulator is connected with FBG respectively, and the 3rd port of each optical circulator is connected with optical coupler respectively; Described each FBG is arranged in the periodic adjustment mechanism.
According to different situations, each FBG can be separately positioned in the independent periodic adjustment mechanism, the corresponding one-period governor motion of each FBG also can all be arranged on each FBG on the one-period governor motion.
The mechanism in above-mentioned scalable FBG cycle is good with piezoelectric ceramic, and piezoelectric ceramic is connected with drive power supply for piezoelectric ceramics; To be arranged in parallel to good, the interval between its centre wavelength is good with 0.2nm between above-mentioned each FBG; Above-mentioned rare earth doped fiber is good with Er-doped fiber.
Advantage of the present invention is:
1. fiber laser is a kind of wavelength shifter efficiently, promptly is the excitation wavelength of institute's er-doped ion by the pumping laser wavelength Conversion.Just because of the excitation wavelength of fiber laser is determined, is not subjected to the control of pumping wavelength by erbium ion, so can utilize and the corresponding cheap short wavelength of erbium ion absorption spectrum, high-power semiconductor laser pumping, obtain near the laser output of optical fiber communication low loss window C-band (1550nm).
2. owing to the cylindrical geometric size of fiber laser, on the one hand, be coupled to easily in the Transmission Fibers of system, greatly simplified the design and the making of fiber laser, and optical fiber has fabulous gentlely around property, make laser quite small and exquisite flexibly, easy to use, the cost performance height; On the other hand, have higher " surface area/volume " ratio, rapid heat dissipation, the operation material heat load is little, need not cooling system, can produce high brightness and high-peak power.
3. tunable multi-wavelength optical fiber laser can solve the weak point of laser with fixed wavelength effectively, can not only make the design of transmitting terminal more compact, economical simultaneously for a plurality of channels provide required light source; And the wavelength of laser output is also tunable, is applicable to the situation of Networks of Fiber Communications medium wavelength dynamic assignment, thereby can improves network more flexible.
4. can be competent at bad working environment, dust, vibration, impact, humidity, temperature are had very high tolerance.
5. because the voltage-regulation scope of drive power supply for piezoelectric ceramics is 0～150V, the single individual wavelengths tuning precision of this laser is 0.00495nm/V, tuning range 0.7425nm.
Description of drawings
Fig. 1 is the structural representation of tunable multi-wavelength fiber laser;
Fig. 2 is the structural representation of tunable multi-wavelength generation unit.
Embodiment
The principle of the tuning performance the subject of knowledge and the object of knowledge foundation of this multi-wavelength optical fiber laser is as follows:
1. pump light source is exported to be delivered in the step 2 after the flashlight coupling of the pump light of first wave band and second wave band and handled;
2. handle in the light input Er-doped fiber with output in the step 1, the first wave band pump light makes the population inversion of erbium ion, and spontaneous amplification radiation (ASE) occurs, forms the spontaneous emission light identical with the flashlight wave band.Spontaneous emission light makes that the flashlight of second wave band described in the step 1 obtains amplifying, and produces excited radiation light; Excited radiation light is one-way transmitted to step 3; The flashlight of second wave band amplifies, the erbium ion that is in ground state level transits to high level under near the pump light effect first wave band, arrive metastable energy level through about slow Henan of 1 μ s time, transit to ground state from metastable energy level again, launch the photon that signal light wavelength is the same, direction is consistent with second wave band, realize that the flashlight of second wave band amplifies;
3. will carry out beam splitting through the light that step 2 is handled, a part of light provides laser output, and another part light feeds back to step 4, and is treated, and export as laser the back that satisfies condition;
4. the light that feeds back to through step 3 carries out beam split, is divided into the identical light of at least two groups;
5. make each road light of handling through step 4 enter the optical circulator of mutual correspondence respectively;
6. the road of each behind optical circulator light enters the FBG of mutual correspondence respectively, changes cycle and the optical fiber Bragg wavelength of each FBG by the length of regulating each FBG, and FBG will reflect the light identical with its bragg wavelength, and the transmittance of different wave length goes out FBG; Light back light circulator through the FBG reflection;
7. the unidirectional step 1 that exports to after each road light of handling through step 6 being coupled, described each road light wavelength all belongs in second wave band.
This tunable multi-wavelength fiber laser comprises pump light source, gain media and annular chamber.Described gain media is the optical fiber of doped rare earth element; Connect successively in the described annular chamber and be provided with WDM, rare earth doped fiber, first optical isolator, optical coupler, tunable multi-wavelength generation unit, second optical isolator; The output of described second optical isolator is connected with an input of wavelength division multiplexer, and pump light source is connected with another input of wavelength division multiplexer; An output of described optical coupler is connected with the input of tunable multi-wavelength generation unit, and another output of optical coupler is used for laser output.
Above-mentioned tunable multi-wavelength generation unit comprises optical branching device, at least two optical circulators, FBG, the optical coupler identical with optical circulator quantity and the periodic adjustment mechanisms that are used to regulate the FBG cycle; An output of optical coupler is connected with optical branching device one end, the optical branching device other end is connected with first port of two optical circulators at least, second port of each optical circulator is connected with FBG respectively, and the 3rd port of each optical circulator is connected with optical coupler respectively; Described each FBG is arranged in the periodic adjustment mechanism.
According to different situations, each FBG can be separately positioned in the independent periodic adjustment mechanism, the corresponding one-period governor motion of each FBG also can all be arranged on each FBG on the one-period governor motion.
The mechanism in above-mentioned scalable FBG cycle is good with piezoelectric ceramic, and piezoelectric ceramic is connected with drive power supply for piezoelectric ceramics; To be arranged in parallel to good, the interval between its centre wavelength is good with 0.2nm between above-mentioned each FBG; Above-mentioned rare earth doped fiber is good with Er-doped fiber.
This tunable multi-wavelength fiber laser is made pumping source by near the laser diode 980nm, adopts the gain media of Er-doped fiber as laser, and the fluorescence Spectra of Er-doped fiber is the broadband light of 1530nm to the 1560nm wave band; Adopt the cavity resonator structure of annular chamber, its resonant cavity comprises tunable multi-wavelength generation unit, optical isolator, 980/1550nm WDM, Er-doped fiber and optical coupler etc.; Adopt FBG as filtering and wavelength selector spare, select needed specific wavelength, many FBG are pasted on the piezoelectric ceramic, change the elongation of piezoelectric ceramic by drive power supply for piezoelectric ceramics, regulate filtering and the wavelength selectivity of many FBG, thereby realize that this laser exports tunable multiwavelength laser.
Above-mentioned Er-doped fiber be with the erbium ion in the rare earth ion with certain doped in concentrations profiled among fibre core.Er-doped fiber is to be excited optical fiber, and it has three level system.Erbium ion can be realized near the light amplification of optical fiber communication low loss window C-band (1550nm), and near the flashlight the 1550nm can bring out erbium ion and produce stimulated radiation.The erbium ion that is in ground state level transits to high level under near the pump light effect the 980nm, arrive metastable energy level through about slow Henan of 1 μ s time, transit to ground state from metastable energy level again, launch the photon the same with signal light wavelength, that direction is consistent, realize near the light amplification that 1550nm is.
Above-mentioned annular chamber is made of following device: 980/1550nm WDM, Er-doped fiber, optical isolator 1, optical coupler, tunable multi-wavelength generation unit and optical isolator 2.WDM is that Er-doped fiber is advanced near the 1550nm optical coupling with near the pump light the 980nm and wavelength.Er-doped fiber is a gain media, forms population inversion within it, produces ASE.Spontaneous emission light enters the input port of optical isolator 1 subsequently, and optical isolator 1 impels light one-way transmission in annular chamber, and light is from the output port output of optical isolator 1 afterwards.Light enters into the input port of optical coupler, and optical coupler is divided into light 20%: 80% two-beam.Wherein the light from the output of 20% port provides laser output; From the light of 80% port output feeds back into annular chamber, enter the input port of tunable multi-wavelength generation unit.Light carries out filtering in this unit and wavelength is selected, and the light that satisfies the FBG Bragg's condition of reflection is selected, and from the output port output of tunable multi-wavelength generation unit, enters the input port of optical isolator 2.Optical isolator 2 is to impel light one-way transmission in annular chamber equally.Light enters into WDM after the output port output of optical isolator 2.So just constituted annular chamber.
As shown in Figure 1: pumping wavelength is near the pump light the 980nm, at first is coupled into the 980nm port of 980/1550nm WDM by tail optical fiber.Enter in the Er-doped fiber by the WDM output port then, Er-doped fiber is a gain media, and it is carried out pumping, will form population inversion in Er-doped fiber, and ASE occurs.Spontaneous emission light enters the input port of optical isolator 1, and optical isolator 1 impels light one-way transmission in annular chamber.Light is from the output port output of optical isolator 1 afterwards.Light enters into the input port of optical coupler, and optical coupler is divided into light 20%: 80% two-beam.Wherein the light from the output of 20% port provides laser output; From the light of 80% port output feeds back into annular chamber, enter the input port of tunable multi-wavelength generation unit.Light carries out filtering in this unit and wavelength is selected, and the light that satisfies the FBG Bragg's condition of reflection is selected, and from the output port output of tunable multi-wavelength generation unit, enters the input port of optical isolator 2.Optical isolator 2 is to impel light one-way transmission in annular chamber equally.Light enters into the 1550nm port of WDM after the output port output of optical isolator 2.Radiant light is coupled in the Er-doped fiber again, finishes once circulation.Each time in the cyclic process, the radiant light energy that meets those wavelength of optical fiber Bragg condition all obtains amplifying, when gain during greater than the loss of radiant light in loop, whole laser ring resonator forms vibration, thereby has realized satisfying the laser output of those wavelength of optical fiber Bragg condition.
As shown in Figure 2: 80% port of light optical coupler from above-mentioned annular chamber is exported, and enters the input port of 1 * N optical branching device.1 * N optical branching device is divided into the N road with incident light, and N road light is exported from N output port of 1 * N optical branching device respectively.N road light enters Port 1 port of the optical circulator 1～N of mutual correspondence respectively then, N road light is respectively behind circulator 1～N, from the Port 2 ports output of optical circulator 1～N, the N root centre wavelength that enters mutual correspondence is near the 1550nm, and centre wavelength is about among the FBG of 0.2nm at interval.N root FBG is pasted on same piezoelectric ceramic abreast, perhaps stick on respectively on N the piezoelectric ceramic of mutual correspondence, length direction along FBG is given the piezoelectric ceramic on-load voltage, regulate drive power supply for piezoelectric ceramics and change the length of piezoelectric ceramic, thereby changed the FBG grating cycle that sticks on the piezoelectric ceramic; According to the optical fiber Bragg conditioned reflex, catoptrical centre wavelength also changes thereupon; The light of the every FBG of satisfying Bragg's condition of reflection will be reflected.The light that is reflected enters Port 2 ports of the optical circulator 1～N of mutual correspondence respectively, passes through optical circulator 1～N once more, from the Port 3 ports output of optical circulator 1～N; Light enters N input port of N * 1 optical coupler of mutual correspondence respectively after the Port 3 ports output of optical circulator 1～N.N * 1 optical coupler closes the output port output of Lu Guangcong N * 1 optical coupler then with synthetic one road light of N road optocoupler, enters the input port of the optical isolator 2 in the above-mentioned annular chamber.So just formed the vibration of light in resonant cavity of N wavelength.
With centre wavelength is near the 1550nm, and N the FBG that centre wavelength is about 0.2nm at interval is pasted on same piezoelectric ceramic abreast, perhaps stick on respectively on N the piezoelectric ceramic of mutual correspondence, length direction along FBG is given the piezoelectric ceramic on-load voltage, regulate the length of drive power supply for piezoelectric ceramics change piezoelectric ceramic, thereby changed the FBG grating cycle that sticks on the piezoelectric ceramic, reach the filtering of each FBG of adjusting and the purpose of wavelength selectivity, finally realize the output of tunable multi-wavelength (N wavelength) optical-fiber laser.
Claims (8)
1. a tunable multi-wavelength fiber laser comprises pump light source, gain media and annular chamber, it is characterized in that: described gain media is the optical fiber of doped rare earth element; Connect successively in the described annular chamber and be provided with wavelength division multiplexer (WDM), rare earth doped fiber, first optical isolator, optical coupler, tunable multi-wavelength generation unit, second optical isolator; The output of described second optical isolator is connected with an input of wavelength division multiplexer, and pump light source is connected with another input of wavelength division multiplexer; An output of described optical coupler is connected with the input of tunable multi-wavelength generation unit, and another output of optical coupler is used for laser output.
2. tunable multi-wavelength fiber laser according to claim 1 is characterized in that: described tunable multi-wavelength generation unit comprises optical branching device, at least two optical circulators, Fiber Bragg Grating FBG (FBG), the optical coupler identical with optical circulator quantity and the periodic adjustment mechanisms that are used to regulate the FBG cycle; An output of optical coupler is connected with optical branching device one end, the optical branching device other end is connected with first port of two optical circulators at least, second port of each optical circulator is connected with FBG respectively, and the 3rd port of each optical circulator is connected with optical coupler respectively; Described each FBG is arranged in the periodic adjustment mechanism.
3. tunable multi-wavelength fiber laser according to claim 2 is characterized in that: described each FBG is separately positioned in the periodic adjustment mechanism.
4. tunable multi-wavelength fiber laser according to claim 2 is characterized in that: described each FBG all is arranged on the one-period governor motion.
5. according to the arbitrary described tunable multi-wavelength fiber laser of claim 1 to 4, it is characterized in that: the mechanism in described scalable FBG cycle is a piezoelectric ceramic, and described piezoelectric ceramic is connected with drive power supply for piezoelectric ceramics.
6. tunable multi-wavelength fiber laser according to claim 5 is characterized in that: described rare earth doped fiber is an Er-doped fiber.
7. tunable multi-wavelength fiber laser according to claim 6 is characterized in that: the mechanism in described scalable FBG cycle is a piezoelectric ceramic, and described piezoelectric ceramic is connected with drive power supply for piezoelectric ceramics.
8. tunable multi-wavelength fiber laser according to claim 7 is characterized in that: described each FBG be arranged in parallel, and is spaced apart 0.2nm between its centre wavelength.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102361211A (en) * | 2011-10-08 | 2012-02-22 | 哈尔滨工程大学 | Fiber laser based on micro-cavity control feedback effect |
| CN103178951A (en) * | 2013-03-15 | 2013-06-26 | 中国科学院半导体研究所 | Chaotic signal generator based on tunable microring resonator |
| CN103337774A (en) * | 2013-05-31 | 2013-10-02 | 西北核技术研究所 | Tunable mode locking fiber laser based on fiber grating and graphene |
| CN103855598A (en) * | 2014-03-21 | 2014-06-11 | 山东理工大学 | Multiple wavelength convertible tunable fiber laser based on tapered fiber |
| CN104752943A (en) * | 2015-04-27 | 2015-07-01 | 天津理工大学 | Interference structure-based dual-wavelength fiber laser |
| CN104768087A (en) * | 2014-01-07 | 2015-07-08 | 上海贝尔股份有限公司 | Method and device for generating multiple-wavelength optical waves, and central office transmission method and device |
| CN105092086A (en) * | 2015-09-01 | 2015-11-25 | 河南师范大学 | Dual-coupling structure-based single-mode core-dislocated fiber temperature measurement method |
| CN105514773A (en) * | 2015-12-10 | 2016-04-20 | 深圳市无牙太赫兹科技有限公司 | Dual-wavelength fiber laser and working method thereof |
| CN108649425A (en) * | 2018-06-06 | 2018-10-12 | 浙江大学 | A kind of portable multi-band optical detection laser source systems |
| CN111029898A (en) * | 2019-12-27 | 2020-04-17 | 深圳市众望达光电有限公司 | O-waveband wavelength-adjustable light source |
| CN112003115A (en) * | 2020-08-20 | 2020-11-27 | 广东科学技术职业学院 | Tunable multi-wavelength fiber laser and control method thereof |
| CN114094445A (en) * | 2022-01-11 | 2022-02-25 | 武汉锐科光纤激光技术股份有限公司 | Light beam processor |
| CN117833001A (en) * | 2024-03-01 | 2024-04-05 | 中北大学 | Tunable narrow linewidth self-excited Brillouin fiber laser |
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| CN102361211A (en) * | 2011-10-08 | 2012-02-22 | 哈尔滨工程大学 | Fiber laser based on micro-cavity control feedback effect |
| CN103178951B (en) * | 2013-03-15 | 2016-05-25 | 中国科学院半导体研究所 | Based on the chaos signal generator of tunable micro-ring resonator |
| CN103178951A (en) * | 2013-03-15 | 2013-06-26 | 中国科学院半导体研究所 | Chaotic signal generator based on tunable microring resonator |
| CN103337774A (en) * | 2013-05-31 | 2013-10-02 | 西北核技术研究所 | Tunable mode locking fiber laser based on fiber grating and graphene |
| CN103337774B (en) * | 2013-05-31 | 2015-09-09 | 西北核技术研究所 | A kind of tunable mode-locked fiber laser based on fiber grating and Graphene |
| CN104768087A (en) * | 2014-01-07 | 2015-07-08 | 上海贝尔股份有限公司 | Method and device for generating multiple-wavelength optical waves, and central office transmission method and device |
| CN104768087B (en) * | 2014-01-07 | 2019-01-18 | 上海诺基亚贝尔股份有限公司 | The method and apparatus and central office transmission method and equipment of generation multi-wavelength light wave |
| CN103855598A (en) * | 2014-03-21 | 2014-06-11 | 山东理工大学 | Multiple wavelength convertible tunable fiber laser based on tapered fiber |
| CN104752943A (en) * | 2015-04-27 | 2015-07-01 | 天津理工大学 | Interference structure-based dual-wavelength fiber laser |
| CN105092086A (en) * | 2015-09-01 | 2015-11-25 | 河南师范大学 | Dual-coupling structure-based single-mode core-dislocated fiber temperature measurement method |
| CN105514773A (en) * | 2015-12-10 | 2016-04-20 | 深圳市无牙太赫兹科技有限公司 | Dual-wavelength fiber laser and working method thereof |
| CN105514773B (en) * | 2015-12-10 | 2018-12-21 | 华讯方舟科技有限公司 | A kind of dual wavelength fibre laser and its working method |
| CN108649425A (en) * | 2018-06-06 | 2018-10-12 | 浙江大学 | A kind of portable multi-band optical detection laser source systems |
| CN111029898A (en) * | 2019-12-27 | 2020-04-17 | 深圳市众望达光电有限公司 | O-waveband wavelength-adjustable light source |
| CN112003115A (en) * | 2020-08-20 | 2020-11-27 | 广东科学技术职业学院 | Tunable multi-wavelength fiber laser and control method thereof |
| CN112003115B (en) * | 2020-08-20 | 2024-05-24 | 广东科学技术职业学院 | Tunable multi-wavelength fiber laser and control method thereof |
| CN114094445A (en) * | 2022-01-11 | 2022-02-25 | 武汉锐科光纤激光技术股份有限公司 | Light beam processor |
| CN117833001A (en) * | 2024-03-01 | 2024-04-05 | 中北大学 | Tunable narrow linewidth self-excited Brillouin fiber laser |
| CN117833001B (en) * | 2024-03-01 | 2024-05-10 | 中北大学 | Tunable narrow linewidth self-excited Brillouin fiber laser |
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Application publication date: 20111005 |