CN102147551B - Multimode optical fibre amplifier and multimode optical fibre amplifying system - Google Patents
Multimode optical fibre amplifier and multimode optical fibre amplifying system Download PDFInfo
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- CN102147551B CN102147551B CN201110081817.2A CN201110081817A CN102147551B CN 102147551 B CN102147551 B CN 102147551B CN 201110081817 A CN201110081817 A CN 201110081817A CN 102147551 B CN102147551 B CN 102147551B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06704—Housings; Packages
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08018—Mode suppression
- H01S3/0804—Transverse or lateral modes
Abstract
The invention provides a multimode optical fibre amplifier and a multimode optical fibre amplifying system, wherein the multimode optical fibre amplifier comprises a multimode optical fibre encircled on an object surface and encircled to be a three-dimensional helical curve shape with a lead and a torque, and the quality of the output beam is near the diffraction limit, M2<1.2. For example, the multimode optical fibre of the three-dimensional helical curve shape is in a right spiral shape or in a left spiral shape. The multimode optical fibre amplifying system comprises a laser light source and the multimode optical fibre and the like. The invention has the advantage that the multimode optical fibre of the three-dimensional helical curve shape can enable the beam quality to reach the diffraction limit while the signal light is amplified; and M2 is less than 1.2, wherein M2=1 expresses that the beam with quality reaching the diffraction limit is Gauss beam.
Description
Technical field
The invention belongs to field fiber, particularly a kind of multimode fiber amplifier and multimode optical fiber amplification system.
Background technology
Single mode (SM) rare earth doped fiber laser instrument and amplifier are widely adopted in telecommunication and industrial processes field.Fiber laser has compactness, reliable, the advantages such as low cost and good beam quality, but laser instrument based on optical fiber is limited by relatively low pulse peak power always.
This low peak Power Limitation is because the nonlinear effect distortion in low-yield storage and optical fiber causes.Because the maximum population inversion of rare earth doped fiber is depended in laser energy storage, the nonlinear effect that restricts the most significantly pulse energy and peak power is from phase-modulation (SPM), stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS).For continuous or long pulse fiber laser system, thereby stimulated Brillouin scattering stops high-average power or peak power pulses at spread fiber.
Current have following several method to break through these restrictions:
1, Taverner et al etc. adopt the long-pending Er-doped fiber of large die face, the numerical aperture NA=0.066-0.0817 of this optical fiber, core diameter 14-17 μ m(V=2.2-2.4) (specifically can be referring to list of references: " D.Taverner, D.J.Richardson, L.Dong, J.E.Caplen, K.Williams, andR.V.Penty, Opt.Lett.22, 378 (1997 " and " G.P.Lees, D.Taverner, D.J.Richardson, L.Dong, and T.P.Newson, Electron.Lett.33, 393 (1997) ")), by reducing numerical aperture NA(with respect to Standard single-mode fiber, as healthy and free from worry SM28, NA=0.15), just can in fiber amplifier, adopt the gain fibre of larger fiber core, and restriction higher order mode is exaggerated.This is because the nonlinear factor of big mode field area fibers reduces, thereby has improved the threshold value of nonlinear effect, so improves the peak power of laser.
2, the numerical aperture of minimizing optical fiber makes spontaneous emission light cannot in optical fiber, propagate or be excited to amplify, thereby increases optical fiber energy capacity.For example, by adjusting, optical fiber pack look rate distributes and doping ion distribution suppresses high-order modes at different levels; Again for example, change incident light parameter by adjusting cavity resonator structure.These methods make image intensifer can use shorter gain fibre, thus corresponding harmful nonlinear effect SPM and the threshold of SRS of having increased.
Concrete, in list of references 1 " D.Marcuse, J.Opt.Soc.Am.66,216 (1976) ", the people such as Knight have proposed the mode of the diameter by increasing photonic crystal fiber, reduce nonlinear fiber coefficient.At list of references 2 " D.Marcuse; J.Opt.Soc.Am.66; 311 (1976). ", list of references 3 " C.C.Davis; Lasers and Electro-Optics (Cambridge U.Press; Cambridge; 1996) " and list of references 4 " J.P.Koplow, L.Goldberg, and D.A.V.Kliner, IEEEPhoton.Technol.Lett.10,793 (1998) ", in, the people such as Koplow propose to utilize multimode yb-doped double-clad fiber bending loss and use optical fiber to filter higher order mode image intensifer.In list of references 5 " M.W.Sasnett and T.F.Johnston; Proc.SPIE1414; 21 (1991). ", the people such as Galvanauskas have proposed a kind of spiral fiber core coupled fiber, and big mode field area keeps a new structured optical fiber of the optical fiber of single mode operation (LMA).
In the american documentation literature that is US006496301B1 at application number, the people such as Koplow have proposed a kind of fiber amplifier, this fiber amplifier comprises right cylinder and helical fibre, its effect of filtering high-order mode is relevant with cylindrical radius, and, from the Fig. 2 in the document, at the diverse location of optical fiber, high-order mode P3 is in xy plane, and this just shows the just effect based on filtering high-order mode and the proposition relevant to radius bend loss of this fiber amplifier.But along with the development of technology, more and more researchist's research shows, the effect of filtering high-order mode is not only relevant to radius bend, and also relevant to mode distortion.Specifically can be referring to Publication about Document:
1, list of references " D.Marcuse, Appl.Opt.21,4208 (1982) ".In the document, Marcuse thinks that the Optical Fiber Winding curvature of big mode field area is very serious to high-order mode distortion.
2, list of references " J.M.Fini, " Bend-resistant design of conventional and microstructure fibers with very large mode area, " Opt.Express 14, 69-81 (2006) ", " J.M.Fini, " Bend-compensated design of large-mode-area fibers, " Opt.Lett.31, 1963-1965 (2006). ", " John M.Fini, " Design of large-mode-area amplifier fibers resistant to bend-induced distortion, " J.Opt.Soc.Am.B 24, 1669-1676 (2007) " and " J.M.Fini, " Intuitive modeling of bend-distortion in large-mode-area fibers, " Opt.Lett.32.1632-1634 (2007) ".In those lists of references, the result that researchist obtains by modes such as numerical simulation calculation has also proved that the beam quality of fiber amplifier is relevant to mode distortion.
Therefore, how existing fiber amplifier is improved, better to filter high-order mode, become those skilled in the art's technical task urgently to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of multimode fiber amplifier and multimode optical fiber amplification system.
In order to achieve the above object and other objects, multimode fiber amplifier provided by the invention, comprising: encompass the multimode optical fiber of three-dimensional spiral curve shape, its output beam quality can reach diffraction limit, M
2be less than 1.2; Wherein, the multimode optical fiber of described three-dimensional spiral curve shape has the radius of spin, torque and helical pitch.
As a kind of optimal way, the helical pitch of the multimode optical fiber of described three-dimensional spiral curve shape can be variable or non-zero constant.
As a kind of optimal way, the spiral curve radius of the multimode optical fiber of described three-dimensional spiral curve shape can be variable or constant.
The present invention also provides a kind of multimode optical fiber amplification system, and it comprises: LASER Light Source; And multimode fiber amplifier described above, for receiving described LASER Light Source, with the second order mode in laser after amplifying described in filtering or light more than second order mode, and output basic mode light.
The advantage of multimode fiber amplifier of the present invention and multimode optical fiber amplification system comprises: can make beam quality in fiber amplifier approach diffraction limit, M
2be less than 1.2, wherein M
2=1 represents the beam quality of diffraction limit: Gaussian beam; The multimode optical fiber of the three-dimensional spiral curve shape comprising in fiber amplifier in addition, can be used as the gain media of amplifying optical signals simultaneously.
Brief description of the drawings
Fig. 1 is multimode fiber amplifier schematic diagram of the present invention.
Fig. 2 a and 2b are the preferred embodiment schematic diagram of the multimode optical fiber that comprises of multimode fiber amplifier of the present invention.
The preferred embodiment schematic diagram that Fig. 3 a to 3d is multimode fiber amplifier of the present invention.
Fig. 4 a to 4e is light-beam position schematic diagram corresponding to light beam different cross section position in the time that multimode fiber amplifier transmits.
Fig. 5 is the experimental structure schematic diagram adopting based on multimode fiber amplifier of the present invention.
The experimental result schematic diagram that Fig. 6 to Fig. 9 obtains for the experimental structure based on shown in Fig. 5.
Embodiment
Refer to Fig. 1 a and Fig. 1 b, multimode fiber amplifier of the present invention comprises the multimode optical fiber that is looped around a body surface and encompasses three-dimensional spiral curve shape, wherein, the multimode optical fiber of described three-dimensional spiral curve shape has helical pitch and torque, and this multimode fiber amplifier energy output beam quality can approach diffraction limit, M
2be less than 1.2; .For example, as shown in Figure 1a, the multimode optical fiber of described three-dimensional spiral curve shape is right-hand screw curve shape.Again for example, as shown in Figure 1 b, the multimode optical fiber of described three-dimensional spiral curve shape is left-hand screw curve shape.
In addition, described multimode fiber amplifier can be profile pump fiber amplifier, also can be end pumping fiber amplifier etc.
As a kind of preferred version, described multimode optical fiber encompasses right three-dimensional spiral curve shape as follows:
L(t)＝acost(
M(t)＝asinl，
N(t)＝b*t
Wherein, L (t), M (t) and N (t) are respectively a dimension in three-dimensional coordinate system, a is the radius of three-dimensional spiral curve, b is the pitch of three-dimensional spiral curve, accordingly, the helical pitch of three-dimensional spiral curve is 2 π b, t ∈ [0, T], T is the maximal value of variable t.Known based on above-mentioned expression formula, the total length of described multimode optical fiber is
its curvature is
torque is
For example, when L (t) is the x dimension in three-dimensional coordinate system, M (t) is the y dimension in three-dimensional system of coordinate, when N (t) is the z dimension in three-dimensional system of coordinate, the three-dimensional spiral curve shape that described multimode optical fiber encompasses as shown in Figure 2 a, adopts xyz volume coordinate to be expressed as:
x(t)＝acost
y(t)＝asint
z(t)＝b*t
Again for example, when L (t) is the x dimension in three-dimensional system of coordinate, M (t) is the z dimension in three-dimensional coordinate system, when N (t) is the y dimension in three-dimensional system of coordinate, the three-dimensional spiral curve shape that described multimode optical fiber encompasses as shown in Figure 2 b, adopts xyz volume coordinate to be expressed as:
x(t)＝acost
y(t)＝b*t。
z(t)＝asint
As another kind of preferred version, described multimode optical fiber encompasses right three-dimensional spiral curve shape as follows:
R(t)＝a*e
it，
O(t)＝b*t
Wherein, R (t) and O (t) they are the dimension in complex space, and a is the radius of three-dimensional spiral curve, and b is the pitch of three-dimensional spiral curve, t ∈ [0, T], and T is the maximal value of variable t.
As another preferred version, described multimode optical fiber encompasses left three-dimensional spiral curve shape as follows:
L(t)＝acost
M(t)＝-asint。
N(t)＝b*t
As another preferred version, described multimode optical fiber encompasses left three-dimensional spiral curve shape as follows:
R(t)＝a*e
-it。
O(t)＝b*t
For each multimode optical fiber described above, the helical pitch of each spiral curve and radius have following several situation:
The first situation: as shown in Figure 3 a, the helical pitch of the multimode optical fiber of described three-dimensional spiral curve shape is non-zero constant, radius is also constant, corresponding, can be cylindrical for the object around described multimode optical fiber, for example, described object is thick cable line etc.Preferably, described multimode optical fiber is thread-shaped at body surface.
Second case: as shown in Figure 3 b, the helical pitch of the multimode optical fiber of described three-dimensional spiral curve shape is non-zero constant, and radius is variable, accordingly, for being truncated cone-shaped around the object of described multimode optical fiber, preferred, described multimode optical fiber is thread-shaped at body surface.
The third situation: as shown in Figure 3 c, the helical pitch of the multimode optical fiber of described three-dimensional spiral curve shape is variable, and radius is constant, accordingly, being used for can be cylindrical around the object of described multimode optical fiber, and preferred, described multimode optical fiber is thread-shaped at body surface.
The 4th kind of situation: as shown in Figure 3 d, the helical pitch of the multimode optical fiber of described three-dimensional spiral curve shape is variable, radius is also variable, accordingly, for being truncated cone-shaped around the object of described multimode optical fiber, preferred, described multimode optical fiber is thread-shaped at body surface.
In addition, as a kind of preferred version, each multimode optical fiber described above all can adopt double clad structure, for example, and the long-pending rare-earth-ion-doped double clad structure of large die face etc.; Core diameter scope between 4 microns to 200 microns, around after the spirochetal length range of multimode optical fiber between 30cm to 5000cm.
It should be noted that, above-mentioned for example only for technical scheme of the present invention is described better, but not limitation of the present invention those skilled in the art should understand that, the multimode optical fiber of any three-dimensional spiral curve shape with helical pitch, all should be within the scope of the present invention.
To further illustrate the gain of described multimode fiber amplifier by numerical simulation and experiment below:
Numerical simulation result: by the repeatedly simulation to the multimode optical fiber with different lead and radius, determine when light beam transmits in described each multimode optical fiber, at multimode optical fiber diverse location basic mode light, second order mode LP
01and the damaged location difference of more than second order high-order mode light, for this reason, Fig. 4 a to Fig. 4 d that provides a simulation to obtain is for reference.Basic mode light, the second order mode LP of the different cross section position obtaining when wherein, Fig. 4 a to Fig. 4 d transmits in multimode optical fiber of the present invention for light beam
01and more than second order high-order mode optical position schematic diagram.From each figure, basic mode, second order mode LP
01and more than second order high-order mode is in different positions, different directions is impaired.But basic mode stands a loss less, second order mode LP
01and more than second order high-order mode is born more loss in multimode fiber amplifier.Reason is: in light amplification process, the gain of basic mode is greater than loss, therefore basic mode luminous power is exaggerated; And second order mode LP
01and more than second order high-order mode is greater than gain at multimode fiber amplifier because of the loss that mode distortion is subject to, therefore second order mode LP
01and more than second order high-order mode luminous power is not amplified.
Experiment:
Select that a core diameter is that 20 μ m, fiber core numerical aperture are 0.06, length is the large mode field area Yb-doped doubly clad optical fiber of 4 meters, wherein, this large mode field area Yb-doped doubly clad optical fiber is 6dB/m at the pump light absorption coefficient of 975-nm, this large mode field area Yb-doped doubly clad optical fiber spiral winding is formed to the multimode fiber amplifier with spiral torque, and according to the access of one end shown in Fig. 5 pump signal wave multiplexer, the pump light that pump laser sends is coupled in described multimode fiber amplifier by this pump signal optical multiplexer, and coupling efficiency is up to 90%.Described multimode fiber amplifier adopts the structure of backward pump: pump light and flashlight are propagated in described multimode fiber amplifier with contrary direction.Pump light wavelength is 976-nm, 105/125 μ m optical fiber output light, and maximum power output is 25W, and flashlight is 1064-nm optical-fiber laser, and described multimode fiber amplifier output terminal is ground into 8 degree angles, to prevent that reflected light from entering described multimode fiber amplifier.
From experimental result as shown in Figures 6 to 9, quality for outputting laser beam is good, and profile is circular, and energy distribution becomes Gaussian; And the energy amplification efficiency of multimode fiber amplifier is up to 66%; Quality for outputting laser beam is through measurement, M
2=1.05, this has confirmed that output beam approaches the beam diffraction limit: Gaussian.Especially in the time that the spiral girth of described multimode fiber amplifier equals helical pitch, the laser beam of described multimode fiber amplifier output is even and rounded, instead of oval.
In sum, multimode fiber amplifier of the present invention is owing to having lead of screw, and along with light beam is propagated in described multimode optical fiber, the curvature direction of described multimode optical fiber bending around the fiber core rotation of described multimode fiber amplifier, causes aggrieved Party to variation gradually.From aforesaid analog result and experimental result, beam attenuation coefficient (dB/m) depends on spiral curvature and lead of screw, therefore, adopt suitable curvature and torsional deformation can distinguish high-order mode, make described multimode fiber amplifier can use core diameter to exceed the threshold value that this value of 2.405(is single-mode fiber diameter, V<2.405) optical fiber, thus can make fiber laser and amplifier produce higher peak power and average power.In addition, for a doubly clad optical fiber that inner cladding diameter is fixed, pump light is absorbed coefficient to be increased and exponential growth with core diameter, even if use so shorter optical fiber, signal also can be amplified to same power.Further, even if increase optical fiber core diameter and inner cladding diameter, and use high power light pumping source, fiber lengths also can correspondingly increase.Further, the input beam of multimode fiber amplifier of the present invention based on any quality and pattern, can export the beam quality of diffraction limit.
The difference of the fiber amplifier that the document (calling documents 1 in the following text) that is US006496301B1 by more detailed explanation the present invention and application number below proposes:
1, the effect of the filtration of the fiber amplifier in documents 1 high-order mode just relies on cylindrical radius, is equivalent to one-dimensional equation; And the effect of multimode fiber amplifier filtration high-order mode of the present invention will be fixed against the helical pitch of radius and the Helical Fiber of object, be equivalent to two-dimentional equation.
2, in Fig. 2 of documents 1, P3 represents the second order of loss and high-order mode more than second order (direction that namely second order and high-order mode more than second order are leaked), from this Fig. 2, the direction of propagation of P3 is along radially cylindrical, in XY plane, those skilled in the art are known based on aforementioned analog result and experimental result, and the helical pitch that this kind of situation can only occur in helical fibre is 0, that is to say, the technology of documents 1 only just discloses the situation that helical pitch is 0.
3, the fiber amplifier in documents 1 utilizes cylinder winding optical fiber, and owing to there is no helical pitch, it need to be by optical fiber in succession around the effect that just can reach output on two orthogonal cylinders and connect rotund laser beam.And multimode fiber amplifier of the present invention just can be exported circular laser beam in the time that helical pitch equates with conveyor screw girth.
4, while the fiber amplifier of documents 1 being accessed between laser bodies and laser output, need between laser bodies and laser output, need and additional one section of optical fiber, output terminal could be mobile flexibly, and additional this section optical fiber also can cause the generation of nonlinear effect; And multimode fiber amplifier of the present invention one end can be directly connected to laser instrument front end body, and the other end is directly connected to laser output.For example, for one 6 meters long mix rare earth gain fibre, if be wound in the spirality of radius a=3cm, helical pitch b=4cm, can calculate the spirochetal length Z=4.8 rice being become by this Optical Fiber Winding.Mixed object (as thick cable line) that rare earth gain fibre spirality is wrapped in certain flexibility when upper when this, one of this optical fiber is linked laser instrument front end body, and laser output is linked in one end in addition.Like this, between laser bodies and output terminal, just can there is the flexible distance of 4.8 meters.Laser bodies volume ratio is larger, and inconvenience is mobile, and laser output volume is little.After adopting spirality gain fibre to connect, do not need to add in extra non-gain fibre situation, laser output just can move and export the laser that good light beam is good flexibly.
In addition, can form multimode optical fiber amplification system based on multimode fiber amplifier of the present invention, described multimode optical fiber amplification system comprises: LASER Light Source and above-mentioned any multimode fiber amplifier.Wherein, described LASER Light Source can be continuous wave light source, can be also pulsating wave light source; Described multimode fiber amplifier is used for receiving described LASER Light Source, the second order mode in the laser that the multimode optical fiber energy filtering of the three-dimensional spiral curve shape that described multimode fiber amplifier comprises is amplified or light more than second order mode, and output basic mode light.
Above-described embodiment just lists expressivity principle of the present invention and effect is described, but not for limiting the present invention.Any person skilled in the art person all can without departing from the spirit and scope of the present invention, modify to above-described embodiment.Therefore, the scope of the present invention, should be as listed in claims.
Claims (10)
1. a multimode fiber amplifier, is characterized in that comprising:
Be looped around a body surface and encompass the multimode optical fiber of the three-dimensional spiral curve shape with helical pitch and torque, wherein, the spiral girth of described three-dimensional spiral curve equals helical pitch.
2. multimode fiber amplifier as claimed in claim 1, is characterized in that: described multimode optical fiber is double clad structure.
3. multimode fiber amplifier as claimed in claim 2, is characterized in that: described multimode optical fiber is rare-earth-ion-doped double clad structure.
4. multimode fiber amplifier as claimed in claim 2, is characterized in that: the core diameter scope of described multimode optical fiber is 4 microns to 200 microns.
5. multimode fiber amplifier as claimed in claim 1, is characterized in that: around after the spirochetal length range of multimode optical fiber be 30cm to 5000cm.
6. multimode fiber amplifier as claimed in claim 1, is characterized in that: described multimode fiber amplifier is profile pump fiber amplifier.
7. multimode fiber amplifier as claimed in claim 1, is characterized in that: described multimode fiber amplifier is end pumping fiber amplifier.
8. a multimode optical fiber amplification system, is characterized in that comprising:
LASER Light Source;
Multimode fiber amplifier in claim 1 to 7 described in any one; be used for receiving described laser signal light; second order mode in the laser that the multimode optical fiber filtering of the three-dimensional spiral curve shape that described multimode fiber amplifier comprises is amplified or light more than second order mode, and output basic mode light.
9. multimode optical fiber amplification system as claimed in claim 8, is characterized in that: described LASER Light Source is continuous wave light source.
10. multimode optical fiber amplification system as claimed in claim 8, is characterized in that: described LASER Light Source is pulsating wave light source.
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| CN201110081817.2A CN102147551B (en) | 2011-04-01 | 2011-04-01 | Multimode optical fibre amplifier and multimode optical fibre amplifying system |
| PCT/CN2012/073169 WO2012130135A1 (en) | 2011-04-01 | 2012-03-28 | Multimode optical fiber amplifier and multimode optical fiber amplification system |
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| CN102147551B (en) * | 2011-04-01 | 2014-08-13 | 国神光电科技（上海）有限公司 | Multimode optical fibre amplifier and multimode optical fibre amplifying system |
| CN105337147B (en) | 2015-11-30 | 2016-11-16 | 深圳市创鑫激光股份有限公司 | A kind of optical fiber laser |
| CN114167548B (en) * | 2022-02-14 | 2022-06-14 | 武汉锐科光纤激光技术股份有限公司 | Optical fiber amplifying device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6496301B1 (en) * | 2000-03-10 | 2002-12-17 | The United States Of America As Represented By The Secretary Of The Navy | Helical fiber amplifier |
| CN1424793A (en) * | 2003-01-10 | 2003-06-18 | 中国科学院上海光学精密机械研究所 | Cylindrical-arranged pluse double-clad optical fibre amplifiers |
| US6724528B2 (en) * | 2001-02-27 | 2004-04-20 | The United States Of America As Represented By The Secretary Of The Navy | Polarization-maintaining optical fiber amplifier employing externally applied stress-induced birefringence |
| CN101052907A (en) * | 2004-07-14 | 2007-10-10 | 密执安州立大学董事会 | Composite waveguide |
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| FI20075685A0 (en) * | 2007-09-28 | 2007-09-28 | Corelase Oy | Optical amplifier |
| CN102147551B (en) * | 2011-04-01 | 2014-08-13 | 国神光电科技（上海）有限公司 | Multimode optical fibre amplifier and multimode optical fibre amplifying system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6496301B1 (en) * | 2000-03-10 | 2002-12-17 | The United States Of America As Represented By The Secretary Of The Navy | Helical fiber amplifier |
| US6724528B2 (en) * | 2001-02-27 | 2004-04-20 | The United States Of America As Represented By The Secretary Of The Navy | Polarization-maintaining optical fiber amplifier employing externally applied stress-induced birefringence |
| CN1424793A (en) * | 2003-01-10 | 2003-06-18 | 中国科学院上海光学精密机械研究所 | Cylindrical-arranged pluse double-clad optical fibre amplifiers |
| CN101052907A (en) * | 2004-07-14 | 2007-10-10 | 密执安州立大学董事会 | Composite waveguide |
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