CN102891429A - Optical fiber-side pump coupler and manufacturing method thereof - Google Patents
Optical fiber-side pump coupler and manufacturing method thereof Download PDFInfo
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- CN102891429A CN102891429A CN2011104563331A CN201110456333A CN102891429A CN 102891429 A CN102891429 A CN 102891429A CN 2011104563331 A CN2011104563331 A CN 2011104563331A CN 201110456333 A CN201110456333 A CN 201110456333A CN 102891429 A CN102891429 A CN 102891429A
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Abstract
The invention discloses an optical fiber-side pump coupler and a manufacturing method thereof. The coupler comprises a main optical fiber and at least one pumped fiber; the connecting part of the main optical fiber is provided with an exposed inner cladding radial outside surface; and the connecting end of the pumped fiber is provided with an end surface structure which is matched with the exposed inner cladding radial outside surface in shape complementarily and is closely connected with the exposed inner cladding radial outside surface. The manufacturing method comprises the following steps of: removing a coating layer from the connecting part of the main optical fiber to expose an inner cladding; removing the coating layer from the connecting end of the pumped fiber to expose a cladding; performing pretreatment on the connecting end of the pumped fiber to form the end surface structure which is complemented with the shape of the exposed inner cladding radial outside surface; correspondingly matching the end surface structure of the pumped fiber with the inner cladding radial outside surface of the main optical fiber connecting part closely to form a coupling area; and eliminating an air layer in the coupling area so that the pumped fiber and the main optical fiber form a whole. The coupler provided by the invention is high in coupling efficiency and high in stability.
Description
Technical field
The present invention relates to the laser technique field, relate in particular to a kind of optical fiber side pumping coupler and manufacture method thereof.
Background technology
High power high-energy light fibre laser and fiber amplifier all have a wide range of applications in industrial processes, military affairs and the field such as medical.But optical-fiber laser power stage level directly is subject to being coupled into the restriction of the pumping light power of gain fibre.For further improving fiber laser power output capacity and system reliability, need to strengthen the pumping light power that enters gain fibre and consistency and the stability that guarantees pump coupling structure.So the pumping coupling of high power, high efficiency and high stable is very part and parcel of fiber laser.
For realizing this demand, full pumped fiber coupling process has now been proposed, it mainly contains end pumping and profile pump.But the fused biconical taper mode that the end pumping coupling adopts can cause the distortion of main fiber fibre core, affect the coupling efficiency of main fiber signal, and the coupler of its making can only be for the main fiber of core diameter less than 30um.Existing side surface coupling mainly contains V-type groove profile pump, microprism side surface coupling etc., and its coupling efficiency all is lower than 90%, and the coupler less stable, can't satisfy the demand of industrial applications.
Summary of the invention
The technical problem that (one) will solve
The technical problem to be solved in the present invention is: optical fiber side pumping coupler and manufacture method thereof that a kind of coupling efficiency height, good stability are provided.
(2) technical scheme
For addressing the above problem, the invention provides on the one hand a kind of optical fiber side pumping coupler, comprise main fiber and at least one pumping optical fiber that is connected with described main fiber profile pump, the connecting portion that described main fiber is connected with described pumping optical fiber has the inner cladding radially-outer surface that exposes, and the link that described pumping optical fiber is connected with described main fiber has with the shape complementarity of the described inner cladding radially-outer surface that exposes coupling and is adjacent to the end face structure that is connected.
Preferably, the radially-outer surface of described main fiber connecting portion inner cladding is for through pretreated smooth or out-of-flatness is surperficial.
Preferably, the quantity of described coupler pumping is determined by main fiber inner cladding diameter D1 and pumping optical fiber diameter D2, namely the quantity of pumping optical fiber less than or equal to
Preferably, described main fiber is double clad or multi-clad.
Preferably, the cross sectional shape of described main fiber inner cladding is circle, hexagon, octagon, D shape or quincunx.
Preferably, described main fiber is the gain fibre that the various gain particles that comprise erbium, ytterbium, neodymium, thulium and neodymium etc. mix and form at fiber core; Or for not mixing the passive fiber of laser gain particle.
Preferably, described main fiber is monomode fiber or multimode fiber.
Preferably, described main fiber is distributed with a plurality of connecting portions in the axial direction, is connected with at least one pumping optical fiber on each connecting portion, forms the multi-stage cascade coupler.
Preferably, described pumping optical fiber can be double clad or multi-clad; Its covering shape can be circle, hexagon, octagon, D shape, the arbitrary shape such as quincunx.
Preferably, the refractive index of described pumping optical fiber and main fiber can equate also can not wait.
Preferably, described pumping optical fiber is monomode fiber or multimode fiber.
On the other hand, the present invention also provides a kind of manufacture method of optical fiber side pumping coupler, may further comprise the steps:
S1: the coat at main fiber connecting portion place is removed, exposed inner cladding; The coat at pumping optical fiber link place is removed, exposed covering;
S2: the place carries out preliminary treatment to the pumping optical fiber link, the end face structure of the inner cladding radially-outer surface shape complementarity at formation and described main fiber connecting portion place;
S3: with corresponding the closely cooperating of radially-outer surface of end face structure with the main fiber connecting portion inner cladding of pumping optical fiber, form the coupled zone;
S4: eliminate the air layer in the coupled zone, so that pumping optical fiber and main fiber form one.
Preferably, described step S2 comprises that also the inner cladding radially-outer surface to the main fiber connecting portion carries out pretreated step, and the pretreated shape complementarity of inner cladding radially-outer surface of the end face structure that forms after the pumping optical fiber preliminary treatment and main fiber connecting portion.
Preferably, the pumping optical fiber pretreatment mode is simultaneously afterburning processing of high-temperature heating, chemical corrosion, mechanical polishing, laser ablation or ion beam etching among the described step S2.
Preferably, the main fiber pretreatment mode is simultaneously afterburning processing of high-temperature heating, chemical corrosion, mechanical polishing, laser ablation or ion beam etching among the described step S2.
Preferably, the mode position high-temperature fusion that the coupled zone air layer is eliminated among the described step S4, high temperature bonding, glue bond, optical contant, directly afterburning applying or liquid filling applying.
(3) beneficial effect
The present invention adopts the pretreated method of pumping optical fiber and main fiber is formed complementary the contact, then the air layer between the complementary contact-making surface is eliminated, and guarantees the efficient coupling of laser from the pumping optical fiber to the main fiber; The design of the complementary contact-making surface of pumping optical fiber of the present invention and main fiber is so that this coupler can be applied to the main fiber of various covering shapes.The present invention does not destroy the fibre core of main fiber in the manufacturing process of coupler, can guarantee that flashlight is also realized efficient coupling in the main fiber; The present invention eliminates the air layer between pumping optical fiber and the complementary contact-making surface of main fiber, makes it form one, guarantees the stability of coupler structure; In addition, the single coupler of the present invention can carry out a plurality of pumping arms and be coupled simultaneously, can realize single coupler high power coupling.
Description of drawings
Fig. 1 a is the structural representation according to the embodiment of the invention one optical fiber side pumping coupler;
Fig. 1 b-d is respectively the generalized section at A1-A1, A2-A2 among Fig. 1 a, A3-A3 place;
Fig. 2 a is the structural representation according to embodiment of the invention two-stage cascade optical fiber side pumping coupler;
Fig. 2 b-d is respectively the generalized section at E1-E1, E2-E2 among Fig. 2 a, E3-E3 place;
Fig. 2 e-g is respectively the generalized section at F1-F1, F2-F2 among Fig. 2 a, F3-F3 place;
Fig. 3 is the flow chart of steps according to the embodiment of the invention two optical fiber side pumping coupler manufacture methods;
Fig. 4 a is the structural representation according to the embodiment of the invention three optical fiber side pumping couplers;
Fig. 4 b-d is respectively the generalized section at B1-B1, B2-B2 among Fig. 4 a, B3-B3 place;
Fig. 5 a is the perspective view according to the embodiment of the invention four optical fiber side pumping couplers;
Fig. 5 b is the generalized section at C-C place among Fig. 5 a;
Fig. 5 c-e is respectively the generalized section at D1-D1, D2-D2 among Fig. 5 b, D3-D3 place;
Wherein, 110 main fibers; 111 connecting portions; 112 inner claddings; The 112a radially-outer surface; 120 pumping optical fibers; 121 links; The 121a end face structure;
210 main fibers; 211 connecting portions; 220 pumping optical fibers;
310 main fibers; 311 connecting portions; 312 inner claddings; The 312a radially-outer surface; 313 coats; 320 pumping optical fibers; 321 links; The 321a end face structure; 322 coats;
410 main fibers; 411 connecting portions; 412 inner claddings; The 412a radially-outer surface; 413 coats; 420 pumping optical fibers; 421 links; The 421a end face structure; 422 coats.
Embodiment
That the present invention is described in detail is as follows below in conjunction with drawings and Examples.
Embodiment one:
Shown in Fig. 1 a-1d, present embodiment has been put down in writing a kind of optical fiber side pumping coupler, comprise main fiber 110 and at least one pumping optical fiber 120 that is connected with described main fiber 110 profile pumps, the connecting portion 111 that described main fiber 110 is connected with described pumping optical fiber 120 has the inner cladding 112 radially-outer surface 112a that expose, and the link 121 that described pumping optical fiber 120 is connected with described main fiber 110 has with the shape complementarity of the described inner cladding radially-outer surface 112a that exposes coupling and is adjacent to the end face structure 121a that is connected.
In some embodiments of the invention, the radially-outer surface 112a of described main fiber 110 connecting portions 111 inner claddings 112 is not for there being the original surface of treated inner cladding; In other embodiment of the present invention, the radially-outer surface 112a of described main fiber 110 connecting portions 111 inner claddings 112 is for through pretreated smooth or out-of-flatness is surperficial (shown in Fig. 1 a-d).
In the present embodiment, the quantity that described coupler can pumping is determined by main fiber 110 inner cladding diameter D1 and pumping optical fiber 120 diameter D2, namely the quantity of pumping optical fiber 120 less than or equal to
(shaft core position in order to main fiber is that the center of circle, diameter are D
1+ D
2The girth of circle, round again after the diameter divided by pumping optical fiber).
The cross sectional shape of described main fiber 110 inner claddings 112 is circle, hexagon, octagon, D shape or the arbitrary shape such as quincunx.
In some embodiments of the invention, 110 of described main fibers are furnished with a connecting portion 111.
In other embodiments of the invention, shown in Fig. 2 a-2g, described main fiber 210 is distributed with a plurality of (more than two) connecting portion 211 in the axial direction, be connected with at least one pumping optical fiber 220 on each connecting portion 211, form the multi-stage cascade coupler, realize the coupling of main fiber 210 multi-point pumps, disperse the pumping point when improving pump power, prevent that local temperature is too high.
Embodiment two:
As shown in Figure 3, present embodiment has been put down in writing a kind of manufacture method of above-mentioned optical fiber side pumping coupler, may further comprise the steps:
S1: the coat at main fiber connecting portion place is removed, exposed inner cladding; The coat at pumping optical fiber link place is removed, exposed covering;
S2: the place carries out preliminary treatment to the pumping optical fiber link, the end face structure of the inner cladding radially-outer surface shape complementarity at formation and described main fiber connecting portion place; Wherein, the pumping optical fiber pretreatment mode is simultaneously afterburning processing of high-temperature heating, chemical corrosion, mechanical polishing, laser ablation or ion beam etching
S3: with corresponding the closely cooperating of radially-outer surface of end face structure with the main fiber connecting portion inner cladding of pumping optical fiber, form the coupled zone;
S4: eliminate the air layer in the coupled zone, so that pumping optical fiber and main fiber form one; Wherein, the mode position high-temperature fusion of coupled zone air layer elimination, high temperature bonding, glue bond, optical contant, directly afterburning applying or liquid filling applying.
In other embodiments of the invention, described step S2 comprises that also the inner cladding radially-outer surface to the main fiber connecting portion carries out pretreated step, and the pretreated shape complementarity of inner cladding radially-outer surface of the end face structure that forms after the pumping optical fiber preliminary treatment and main fiber connecting portion.Wherein, the main fiber pretreatment mode is simultaneously afterburning processing of high-temperature heating, chemical corrosion, mechanical polishing, laser ablation or ion beam etching.
The below illustrates the present invention with embodiment more specifically:
Embodiment three:
Be depicted as the optical fiber side pumping coupler of present embodiment such as Fig. 4 a-4d, its manufacture method is: one fibre core/inner cladding diameter is respectively the coat 313 of octagon double clad main fiber 310 of 20/400um along the axial removal 3cm of main fiber 310, expose inner cladding 312, form connecting portion 311; Fibre core/the cladding diameter of 2 pumping optical fibers 320 is respectively 200/220um, and its coat 322 is axially removed 3cm, exposes covering, forms link 321; Adopt the link 321 of mechanical polishing pumping optical fiber 320 to carry out the grinding and polishing processing, make the end face structure 321a of the complementary coupling of radially-outer surface 312a of its formation and octagon double clad main fiber 310 inner claddings 312, complementary shape is shown in Fig. 4 b-4d.Then the end face structure 321a of described 2 pretreated pumping optical fibers 320 and the inner cladding radially-outer surface 312a of octagon main fiber 310 are mated and close contact mutually, form the coupled zone.At last, the mode that adopts oxyhydrogen flame to heat makes the hollow gas-bearing formation elimination of coupled zone and fuses into one, and namely finishes coupler and makes.
Embodiment four:
Be depicted as the optical fiber side pumping coupler of present embodiment such as Fig. 5 a-5e, its manufacture method is: one fibre core/inner cladding diameter is respectively the coat 413 of circular double clad main fiber 410 of 50/400um along the axial removal 3cm of main fiber 410, expose inner cladding 412, form connecting portion 411; Fibre core/the cladding diameter of 6 pumping optical fibers 420 is respectively 200/220um, with the axial removal 3cm of its coat 422 along pumping optical fiber 420, exposes covering, forms link 421; Adopt pulse laser that pumping optical fiber 420 is carried out etching processing, form circular-arc end face structure, make the radially-outer surface 412a complementation of the inner cladding 412 that its and circular main fiber 410 connecting portions 411 places expose, complementary shape is shown in Fig. 5 c-5e.Then the end face structure 421a of 6 pretreated pumping optical fibers 420 and the inner cladding radially-outer surface 412a of circular main fiber 410 are mated and close contact mutually, form the coupled zone.At last, the mode that adopts oxyhydrogen flame to heat makes the hollow gas-bearing formation elimination of coupled zone and fuses into one, and namely finishes coupler and makes.
Coupler coupling efficiency of the present invention is high, Stability Analysis of Structures.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; in the situation that does not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. optical fiber side pumping coupler, comprise main fiber and at least one pumping optical fiber that is connected with described main fiber profile pump, it is characterized in that, the connecting portion that described main fiber is connected with described pumping optical fiber has the inner cladding radially-outer surface that exposes, and the link that described pumping optical fiber is connected with described main fiber has with the shape complementarity of the described inner cladding radially-outer surface that exposes coupling and is adjacent to the end face structure that is connected.
2. optical fiber side pumping coupler as claimed in claim 1 is characterized in that, the radially-outer surface of described main fiber connecting portion inner cladding is for through pretreated smooth or out-of-flatness is surperficial.
3. optical fiber side pumping coupler as claimed in claim 1 is characterized in that, the quantity of described coupler pumping is determined by main fiber inner cladding diameter D1 and pumping optical fiber diameter D2, namely the quantity of pumping optical fiber less than or equal to
4. optical fiber side pumping coupler as claimed in claim 1 is characterized in that, the cross sectional shape of described main fiber inner cladding is circle, hexagon, octagon, D shape or quincunx.
5. optical fiber side pumping coupler as claimed in claim 1 is characterized in that, described main fiber is distributed with a plurality of connecting portions in the axial direction, is connected with at least one pumping optical fiber on each connecting portion, forms the multi-stage cascade coupler.
6. the manufacture method of an optical fiber side pumping coupler is characterized in that, may further comprise the steps:
S1: the coat at main fiber connecting portion place is removed, exposed inner cladding; The coat at pumping optical fiber link place is removed, exposed covering;
S2: the place carries out preliminary treatment to the pumping optical fiber link, the end face structure of the inner cladding radially-outer surface shape complementarity at formation and described main fiber connecting portion place;
S3: with corresponding the closely cooperating of radially-outer surface of end face structure with the main fiber connecting portion inner cladding of pumping optical fiber, form the coupled zone;
S4: eliminate the air layer in the coupled zone, so that pumping optical fiber and main fiber form one.
7. manufacture method as claimed in claim 6, it is characterized in that, described step S2 comprises that also the inner cladding radially-outer surface to the main fiber connecting portion carries out pretreated step, and the pretreated shape complementarity of inner cladding radially-outer surface of the end face structure that forms after the pumping optical fiber preliminary treatment and main fiber connecting portion.
8. manufacture method as claimed in claim 6 is characterized in that, the pumping optical fiber pretreatment mode is simultaneously afterburning processing of high-temperature heating, chemical corrosion, mechanical polishing, laser ablation or ion beam etching among the described step S2.
9. manufacture method as claimed in claim 7 is characterized in that, the main fiber pretreatment mode is simultaneously afterburning processing of high-temperature heating, chemical corrosion, mechanical polishing, laser ablation or ion beam etching among the described step S2.
10. manufacture method as claimed in claim 6 is characterized in that, the mode position high-temperature fusion that the coupled zone air layer is eliminated among the described step S4, high temperature bonding, glue bond, optical contant, directly afterburning applying or liquid filling applying.
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Cited By (5)
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| WO2015081759A1 (en) * | 2013-12-03 | 2015-06-11 | 方笑尘 | A high-power optical fiber power combiner |
| CN105281186A (en) * | 2015-11-19 | 2016-01-27 | 北京工业大学 | Lateral bidirectional pump fusion type coupler and manufacturing method thereof |
| CN105633778A (en) * | 2016-03-28 | 2016-06-01 | 中国人民解放军国防科学技术大学 | High-order-mode filtering optical fiber end surface pumping coupler and manufacture method thereof |
| CN106324759A (en) * | 2016-10-20 | 2017-01-11 | 北京工业大学 | (N+1)*1 type side pumping optical fiber coupler based on triple-cladding fiber |
| CN110071415A (en) * | 2017-12-18 | 2019-07-30 | 朗美通经营有限责任公司 | The coupling of aiming beam optical fiber side |
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| CN105281186A (en) * | 2015-11-19 | 2016-01-27 | 北京工业大学 | Lateral bidirectional pump fusion type coupler and manufacturing method thereof |
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| CN106324759A (en) * | 2016-10-20 | 2017-01-11 | 北京工业大学 | (N+1)*1 type side pumping optical fiber coupler based on triple-cladding fiber |
| CN110071415A (en) * | 2017-12-18 | 2019-07-30 | 朗美通经营有限责任公司 | The coupling of aiming beam optical fiber side |
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