CN104678498A - Quasi distributed optical fiber beam combiner - Google Patents
Quasi distributed optical fiber beam combiner Download PDFInfo
- Publication number
- CN104678498A CN104678498A CN201510102070.2A CN201510102070A CN104678498A CN 104678498 A CN104678498 A CN 104678498A CN 201510102070 A CN201510102070 A CN 201510102070A CN 104678498 A CN104678498 A CN 104678498A
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- optical fiber
- quasi
- bundling device
- distributed
- beam combiner
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Lasers (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
The invention relates to a quasi distributed optical fiber beam combiner. The quasi distributed optical fiber beam combiner comprises a signal fiber and a plurality of pump fibers, wherein each pump fiber is welded on the signal fiber, and welding surfaces are formed at welding positions; the centers of the welding surfaces are dispersedly distributed in a [0-phi]*[0-L] area of a (theta, z) plane formed by expanding the outer surface of the signal fiber; all coupling connection points are packaged inside a unified heat-dissipating packaging shell to form an optical fiber beam combiner applicable to an optical fiber laser. The quasi distributed optical fiber beam combiner has the advantages as follows: through the connection points in spatial disperse distribution, quasi distributed pump power coupling is performed, so that the optical power and the heating spatial density are reduced, the defect that in the conventional beam combiner, the heating spatial density of the coupling connection points is too high is overcome, the working stability is improved, the long-term reliability of the optical fiber beam combiner is improved, and the service life of the optical fiber beam combiner is prolonged; the quasi distributed optical fiber beam combiner has a wide application space in the fields of high-power continuous optical fiber lasers, quasi continuous optical fiber lasers, pulse optical fiber lasers and the like.
Description
Technical field
The present invention relates to a kind of optical-fiber bundling device.
Background technology
Optical-fiber bundling device is one of critical piece in fiber laser and fiber amplifier, multichannel pump laser power is coupled to the inner cladding of passive doubly clad optical fiber by it, then with active double clad fiber welding, enter doped core through the multiple reflections of inner cladding to be absorbed, thus amplification is produced to flashlight.Optical-fiber bundling device plays very important effect in the systems such as fiber laser, it is one of limited resource of the peak power output of fiber laser, exploitation large-power optical fiber bundling device actively can promote high power fiber laser effectively, comprises the development of high power CW fiber laser, high-power quasi-continuous fiber laser, pulse optical fiber etc.
N number of optical fiber is mainly formed a multicore composite fiber by fused biconical taper technique by current optical-fiber bundling device, the doubly clad optical fiber then expanded with other end docking fusion; Or N number of optical fiber is carried out side fusion in the side of double clad signal fiber.Such method all can cause too concentrate at coupling fusion point, the space density of ambient light power and heating is excessive, makes this region that thermal accumlation easily occur and temperature raises, and easily causes damage and the damage of device in this region.Manufacturing process and actual use of these traditional bundling device structures all receive huge test.Along with the further raising of high power fiber laser power level, be badly in need of a kind of novel optical fiber bundling device that can alleviate luminous power and heating space density problems of too of exploitation.
Summary of the invention
The object of this invention is to provide a kind of based on quasi-distributed multiple spot coupling access, be applicable to high power fiber laser very effectively can alleviate luminous power and the excessive weakness of heating space density, there is the novel optical fiber bundling device of better stability and long-term reliability.
For achieving the above object, the technical solution used in the present invention is:
A kind of quasi-distributed optical fiber bundling device, it comprises a signal optical fibre and many pumping optical fibers, pumping optical fiber described in every root to be all fused on described signal optical fibre and to form fusion face at the two phase weld, (the θ that the outwardly deploying that the center of the fusion face described in each is distributed in described signal optical fibre is formed, z) in [0-φ] × [0-L] region in plane, described (θ, z) in plane, longitudinal axis θ corresponds to the circumferential angle circumferentially of described signal optical fibre, and transverse axis z corresponds to the axis of described signal optical fibre.
The numerical value of described L is within the scope of 5-30mm.
The numerical value of described φ is within the scope of 180-360 °.
Described signal optical fibre is core diameter 20-30 μm, the passive doubly clad optical fiber of non-impurity-doped of inner cladding diameter 200-400 μm.
Described pumping optical fiber to be core diameter be 105 μm, the pumping laser Transmission Fibers of cladding diameter 125 μm.
Described quasi-distributed optical fiber bundling device also comprises the fixing of optical fiber and encapsulating structure part.
Fixing and the encapsulating structure part of described optical fiber comprise wherein be provided with described signal optical fibre and described pumping optical fiber metal shell, be filled in described metal shell and the highly heat-conductive material between described signal optical fibre and described pumping optical fiber.
Because technique scheme is used, the present invention compared with prior art has following advantages: quasi-distributed optical fiber bundling device of the present invention adopts multiple coupled power access point, has disperseed the space density of luminous power, thus:
1, the problem that luminous power is too concentrated is overcome;
2, structure has extensibility (scalability), is keeping under basic structure and the constant condition of process for making, and the number of branches of pumping optical fiber can from 2 to 50, even more.Identical Structure and energy method can the optical-fiber bundling device device of compatible different size;
3, part pumping access tributary can be allowed to have damage, only need the branch abandoning damage, other branch still can use, and avoiding a branch in the optical-fiber bundling device of other structure has flaw to cause the problem of whole component failure, improves the robust nature of device;
4, main signal optical fiber is optical coherence, does not have cut-out point and optics point of discontinuity, thus the undesirable elements such as the loss of flashlight, scattering, reflection are all inhibited;
5, the radiating condition of this device package improves;
6, job stability and long-term reliability are improved;
7, under identical condition of work, device lifetime is extended;
8, the material cost of device and manufacture craft cost lower.
Accompanying drawing explanation
Accompanying drawing 1 is the side structure schematic diagram of quasi-distributed optical fiber bundling device of the present invention.
Accompanying drawing 2 is the cross-sectional structure schematic diagram of quasi-distributed optical fiber bundling device of the present invention.
Accompanying drawing 3 is the schematic diagram that quasi-distributed optical fiber bundling device of the present invention has different access tributary number: a) access four pumping optical fibers; B) six roots of sensation pumping optical fiber is accessed; C) eight pumping optical fibers are accessed.Wherein dotted line represents, pumping optical fiber is at the back side of signal optical fibre.
Accompanying drawing 4 is the manufacturing process flow schematic diagram of quasi-distributed optical fiber bundling device of the present invention.
Accompanying drawing 5 is the first application system structural representation of quasi-distributed optical fiber bundling device of the present invention.
Accompanying drawing 6 is the second application system structural representation of quasi-distributed optical fiber bundling device of the present invention.
Accompanying drawing 7 is the schematic diagram of (θ, z) plane around signal optical fibre of the present invention and fusion point space distribution.
In above accompanying drawing: 11, pumping optical fiber; 12, signal optical fibre; 31, end face luminous power absorber; 32, front end fiber grating; 33, pump laser; 34, optical-fiber bundling device of the present invention; 35, double-cladding doped fiber; 36, rear end fiber grating; 37, optoisolator and collimating apparatus; 41, miniwatt seed laser; 51, pumping number of branches be 4 optical-fiber bundling device; 52, pumping number of branches be 6 optical-fiber bundling device; 53, pumping number of branches be 8 optical-fiber bundling device; 71, the position of face of weld central point in (θ, z) plane.
Note: above accompanying drawing is non-to be drawn in proportion, is not used in mapping tolerance.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: as shown in Figures 1 and 2, a kind of quasi-distributed optical fiber bundling device 34, its primary structure comprises one and adopts the signal optical fibre 12 of the passive doubly clad optical fiber of non-impurity-doped and the many pumping optical fibers 11 adopting pumping laser to transmit, wherein, the core diameter of signal optical fibre 12 is 20 μm (span can be 20-30 μm), inner cladding diameter is 250 μm (span can be 200-400 μm), outer cladding diameter is 400 μm, it is passive double clad (DCF) optical fiber, the core diameter of pumping optical fiber 11 is 105 μm, cladding diameter is 125 μm, numerical aperture is 0.15, it is passive fiber.Every root pumping optical fiber 11 is fused on signal optical fibre 12 all from the side, thus forms fusion face at the two phase weld.In the present embodiment, pumping optical fiber 11 has 6, and they are placed as one group between two, and welding is in the both sides of the diverse location of signal optical fibre 12 symmetrically respectively, and they are not in same plane simultaneously.More properly, (the θ that the fusion point center of these pumping optical fibers is formed at the outwardly deploying of signal optical fibre 12, z) coordinate in plane is respectively: (5mm, 0 °), (5mm, 180 °), (11mm, 90 °), (11mm, 270 °), (17mm, 0 °), on (17mm, 180 °) these 6 positions.In (θ, z) plane, longitudinal axis θ corresponds to the circumferential angle circumferentially of signal optical fibre 12, and transverse axis z corresponds to the axis of signal optical fibre 12.Multiple pumping optical fiber 11 can be disperseed as much as possible like this, the effect of best thermal effect dispersion can be reached, as shown in accompanying drawing 3 (b).Such arrangement is, for circle arranges or linearly arranges vertically, further can reduce the space density of luminous power and heating relative to each pumping optical fiber 11 in classic method along the circumference of signal optical fibre 12.
Except above-mentioned signal optical fibre 12 and pumping optical fiber 11, quasi-distributed optical fiber bundling device 34 also comprises the fixing of optical fiber and encapsulating structure part, the fixing and encapsulating structure part of optical fiber comprise wherein be installed with signal optical fibre 12 and pumping optical fiber 11 metal shell, be filled in metal shell and the highly heat-conductive material between signal optical fibre 12 and pumping optical fiber 11.Metal shell is used for carrying out heat radiation and mechanical support and protection.
The Making programme of the quasi-distributed optical fiber bundling device 34 in the present embodiment as shown in Figure 4.First optical fiber is carried out pre-service preparation: the surrounding layer removing signal optical fibre 12 with chemical solvent, and the outside surface of its inner cladding is cleaned out; The outside of multiple pumping optical fiber 11 is cleaned out, and their termination is ground to form the oblique angle of 45 degree.Then by multiple pumping optical fiber 11 according to matching between two, each operation a pair optical fiber, is undertaken aiming at by them and signal optical fibre 12 and locally heat fused.Adopting the method for matching between two, is to allow the pressure from both sides on signal optical fibre 12 cancel out each other, preventing signal optical fibre 12 transverse shifting.A pair pumping laser optical fiber is placed on symmetrically the both sides of signal optical fibre 12, end face is attached to the relevant position on the periphery of signal optical fibre 12 and adjusts angle, makes the two basic laminating.Carry out local irradiation heating with the tie point of carbon dioxide laser beam to pumping optical fiber 11 and signal optical fibre 12 of wavelength 10.6 μm, in the process that they are softening, suitably apply certain thrust to them, make to infiltrate fusion well.After they infiltrate fusion, pull this to pumping optical fiber 11 slightly backward, make the deformation quantity of signal optical fibre 12 appearance minimum, keep optical continuity and the flatness of its best.In optical fiber fusion process, monitor with light power meter, the displacement of fine setting two pumping optical fibers 11, make light return loss minimum, coupling pump light efficiency is maximum, and flashlight Insertion Loss is minimum.After reaching Best Point, allow the irradiation power of carbon dioxide laser reduce until close gradually, optical fiber welding junction is cooled gradually, again applies the surrounding layer of signal optical fibre 12 afterwards.Bundling device after solidification is carried out optical parametric integration test, comprising: the parameters such as coupling pump light efficiency, pump light are return, flashlight insertion loss, flashlight are return, flashlight crosstalk.Encapsulate after test: the optical fiber that welding is good is put into substrate slot, add the packing material of high heat conduction, be then fixed with glue.Finally use metal material as the shell of device, shell has fixed orifice, for this device and external heat sink or heat sink being connected and fixed.
[principle explanation] is well-known, pumping laser is incorporated into the inner cladding of doping double-cladding optical fiber by fiber laser and fiber amplifier, enter fibre core by the multiple reflections in inner cladding and be doped Impurity Absorption, form charge carrier reversion, thus shape pair signals produces gain.Generally that multichannel pumping laser imports in double-cladding doped fiber simultaneously, so very large in the pump laser power density of Rendezvous Point.Under large power density, the slight flaws of fiber optic materials and structure and point of discontinuity all can cause a large amount of light absorption and cause heating.And under high luminous power, the heating of a very small scale will cause serious adverse consequences, comprise the optical field distribution change in refraction index changing, covering and core waveguide, light scattering, light reflection and optical fiber damage.If optical power density is large, the requirement for optical-fiber bundling device technique can be very high; If optical power density suitably reduces, can alleviate technologic requirement.The remittance of each pumping laser point is carried out compartition by the present invention, allows their interval increase, imports in the mode of APPROXIMATE DISTRIBUTION formula, instead of import from very contiguous point, so space average optical power density can reduce.The space average optical power density of optical-fiber bundling device 34 of the present invention, is compared to the optical-fiber bundling device of other structure, roughly can reduce by 50% to several times.Based on the reduction of maximum luminous power density, we just can obtain above-mentioned every benefit.
(θ is set up on the basis that we can launch in signal optical fibre 12 circumferential surface, z) coordinate, form (θ, z) two-dimensional space, also can be referred to as (θ, z) plane, its longitudinal axis θ corresponds to the circumferential angle circumferentially of signal optical fibre 12, transverse axis z corresponds to the axis of signal optical fibre 12, see accompanying drawing 7.Multiple fusion faces (comprising its center) of optical-fiber bundling device are actually the multiple points be distributed in this (θ, z) plane.The scope of θ is the interval of [0-φ], and the value of φ is generally 180-360 °; The scope of z is the interval of [0-L], and L is generally 5-30mm.We illustrate now, traditional 6+1:1 are drawn to the optical-fiber bundling device of wimble structure, and their fusion EDS maps is on an identical L, and θ is distributed in 0 °, 60 °, 120 °, 180 °, 240 °, on 300 ° of these positions.And for the optical-fiber bundling device of traditional tree structure, their fusion EDS maps in θ=0 °, 180 °, on the position that L is different.Their weakness is, these traditional structures are all at utmost not low disperses fusion point, and this is also that the present invention will solve and perfect problem.The present invention is not limited to the structure of traditional same circumference fusion and simple tree structure, but fusion face is distributed in more equably the whole (θ of device permission, z) on plane domain, the fusion face of making farthest disperses arrangement, and the space density of luminous power and heat farthest reduces.
With reference to the accompanying drawings 3, carry out illustrating of a numerical value.Scheming the optical-fiber bundling device 51 a), a signal optical fibre 12 accesses four pumping optical fibers 11, the center in the fusion face of 4 pumping optical fibers is at (θ, z) coordinate in plane is respectively: (5mm, 0 °), (5mm, 180 °), (20mm, 90 °), on (20mm, 270 °) these 4 positions.Scheme the optical-fiber bundling device 52 b), a signal optical fibre 12 has accessed six roots of sensation pumping optical fiber 11, the center, fusion face of 6 pumping optical fibers is at (θ, z) coordinate in plane is respectively: (5mm, 0 °), (5mm, 180 °), (11mm, 90 °), (11mm, 270 °), (17mm, 0 °), on (17mm, 180 °) these 6 positions.Scheme the optical-fiber bundling device 53 c), a signal optical fibre 12 accesses eight pumping optical fibers 11, the center, fusion face of eight pumping optical fibers is at (θ, z) coordinate in plane is respectively: (5mm, 0 °), (5mm, 180 °), (10mm, 90 °), (10mm, 270 °), (15mm, 0 °), (15mm, 180 °), (20mm, 90 °), on (20mm, 270 °) these 8 positions.In reality, the on-position of pumping optical fiber 11 can be arranged as required, is not limited to the situation that above-mentioned numerical value limits.
This optical-fiber bundling device 34 is innovatively by quasi-distributed many fusion points access way, very effectively can alleviate the disadvantage that the space density of luminous power and heating is excessive, have good stability and long-term reliability, the exploitation for high power fiber laser provides a kind of new technical support.
Above-mentioned optical-fiber bundling device 34 can be applied in system as shown in Figure 5.This system comprises end face luminous power absorber 31, front end fiber grating 32, optical-fiber bundling device 34, multiple pump laser 33, double-cladding doped fiber 35, rear end fiber grating 36, optoisolator and collimating apparatus 37.Wherein, the front end of signal optical fibre 12 in optical-fiber bundling device 34 is arranged at after the series connection of end face luminous power absorber 31, front end fiber grating 32, and double-cladding doped fiber 35, rear end fiber grating 36, optoisolator and collimating apparatus 37 are in series and be arranged at the rear end of signal optical fibre 12 in optical-fiber bundling device 34, and pump laser 33 is connected to the end of pumping optical fiber 11 in optical-fiber bundling device 34 correspondingly.
Above-mentioned optical-fiber bundling device 34 can also be applied in system as shown in Figure 6.This system comprises miniwatt seed laser 41, optical-fiber bundling device 34, multiple pump laser 33, double-cladding doped fiber 35, optoisolator and collimating apparatus 37, miniwatt seed laser 41 is arranged at the front end of signal optical fibre 12 in optical-fiber bundling device 34, double-cladding doped fiber 35, optoisolator and collimating apparatus 37 is in series and is arranged at the rear end of signal optical fibre 12 in optical-fiber bundling device 34, and pump laser 33 is connected to the end of pumping optical fiber 11 in optical-fiber bundling device 34 correspondingly.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1. a quasi-distributed optical fiber bundling device, it comprises a signal optical fibre and many pumping optical fibers, pumping optical fiber described in every root to be all fused on described signal optical fibre and to form fusion face at the two phase weld, it is characterized in that: (the θ that the outwardly deploying that the center of the fusion face described in each is distributed in described signal optical fibre is formed, z) in [0-φ] × [0-L] region in plane, described (θ, z) in plane, longitudinal axis θ corresponds to the circumferential angle circumferentially of described signal optical fibre, transverse axis z corresponds to the axis of described signal optical fibre.
2. quasi-distributed optical fiber bundling device according to claim 1, is characterized in that: the numerical value of described L is within the scope of 5-30mm.
3. quasi-distributed optical fiber bundling device according to claim 1, is characterized in that: the numerical value of described φ is within the scope of 180-360 °.
4. quasi-distributed optical fiber bundling device according to claim 1, is characterized in that: described signal optical fibre is core diameter 20-30 μm, the passive doubly clad optical fiber of non-impurity-doped of inner cladding diameter 200-400 μm.
5. quasi-distributed optical fiber bundling device according to claim 1, is characterized in that: described pumping optical fiber to be core diameter be 105 μm, the pumping laser Transmission Fibers of cladding diameter 125 μm.
6. quasi-distributed optical fiber bundling device according to claim 1, is characterized in that: described quasi-distributed optical fiber bundling device also comprises the fixing of optical fiber and encapsulating structure part.
7. quasi-distributed optical fiber bundling device according to claim 6, is characterized in that: the fixing and encapsulating structure part of described optical fiber comprise wherein be provided with described signal optical fibre and described pumping optical fiber metal shell, be filled in described metal shell and the highly heat-conductive material between described signal optical fibre and described pumping optical fiber.
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| CN201510102070.2A CN104678498A (en) | 2015-03-09 | 2015-03-09 | Quasi distributed optical fiber beam combiner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104917041A (en) * | 2015-06-23 | 2015-09-16 | 中国科学院半导体研究所 | High-power optical fiber pump combiner |
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