CN103529517B - The optical fiber splicing method of ultralow light loss - Google Patents
The optical fiber splicing method of ultralow light loss Download PDFInfo
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- CN103529517B CN103529517B CN201310530943.0A CN201310530943A CN103529517B CN 103529517 B CN103529517 B CN 103529517B CN 201310530943 A CN201310530943 A CN 201310530943A CN 103529517 B CN103529517 B CN 103529517B
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Abstract
The present invention relates to a kind of optical fiber splicing method of ultralow light loss, it comprises the following steps: (a) pre-service: hot soarfing division removes coat, (b) micrometering: obtain the fibre core of optical fiber and the side-play amount of inner cladding center of gravity and offset direction, c () grinds: grind along fibre core and inner cladding center of gravity line direction optical fiber inner cladding, d () aims at welding four steps, it utilizes micrometering to obtain the fibre core of optical fiber and the side-play amount of inner cladding center of gravity and offset direction, thus the inner cladding of a wherein optical fiber is ground, guarantee that inner cladding center of gravity and fibre core are aimed at simultaneously, after making fused fiber splice, fibre core still keeps accurate alignment, significantly reduce the light loss of this fusion point, light scattering, the heating that light reflection and light absorption cause, improve the optical continuity of this fusion point, thus the requirement reduced this fusion point package cooling, reduce and the potential damage of other optical element in fiber ring laser system is threatened.
Description
Technical field
The present invention relates to a kind of welding process of doubly clad optical fiber, particularly for the welding process of the ultralow light loss doubly clad optical fiber of high power fiber laser.
Background technology
Modern material process technology has entered the Laser Processing epoch, and wherein fiber laser has won market concern widely with its superior beam quality and large Output optical power.In fiber laser, because luminous power is multikilowatt or more high-power, the quality for optical fiber fusion welding point proposes high requirement.The fiber core mismatch of optical fiber fusion welding point or other flaw all can cause the heating of local, even cause this fusion point to burn or cause inside fiber ring laser system optical component damage due to light reflection.
The heating means that current fused fiber splice equipment adopts are: electrode discharge heating, the heating of graphite duration and degree of heating and carbon dioxide laser heating, and alignment so is: core is aimed at, covering is aimed at, and view mode is: side is observed and end view.But the core diameter that all these modes still can not realize high-quality aims at welding, reason is the different model of each different optical fiber producer, same producer, in the different batches of same model, fibre core has the centrifugal skew (namely fibre core is eccentric) of different depth relative to inner cladding.When we aim at according to covering mode time, its fibre core can have dislocation; When we aim at according to fibre core mode time, seem on the surface fibre core be aim at, actually this is not so.Because when after heat welded, the covering of the doubly clad optical fiber on both sides is because have larger quality, under the capillary effect of fused optic fiber material, the fibre core of both sides optical fiber departs from that the amplitude of inner cladding center of gravity is different, direction is different, make two melting coverings with transversion malposition under capillary draw, the fibre core that originally targeted by is dragged to the position of departing from.Because the fibre core of optical fiber departs from, or being called decentraction, is ubiquitous, so traditional welding process cannot solve the displacement of fibre core after welding, also just cannot realize accurate fibre core and aim at welding.
Summary of the invention
The present invention seeks to the ultralow light loss optical fiber splicing method providing a kind of accurate fibre core to aim to overcome the deficiencies in the prior art.
For achieving the above object, the technical solution adopted in the present invention is: a kind of optical fiber splicing method of ultralow light loss, and it comprises the following steps:
(a) pre-service: remove the coat of two optical fiber in welding area with hot soarfing division;
B () micrometering: carry out micrometering to the end face of two optical fiber respectively, obtains the fibre core of optical fiber and the side-play amount of inner cladding center of gravity and offset direction;
C () grinds: according to side-play amount and the offset direction of the fibre core obtained in step (b) and inner cladding center of gravity, the inner cladding centre of gravity place of optical fiber is calculated by following center of gravity calculation formula (1) and formula (2), determine that fibre core departs from the Distance geometry angle of inner cladding center of gravity, then optic fiber polishing machine is utilized to grind along fibre core and inner cladding center of gravity line direction a wherein optical fiber inner cladding, until the inner cladding center of gravity of two optical fiber and fibre core spacing are from identical, and by " fibre core-inner cladding center of gravity " line bearing mark of two optical fiber in the surface of optical fiber
In formula, x
0and y
0be the coordinate of center of gravity, Ω is the two-dimensional space region of inner cladding end face;
D () aims at welding: these two optical fiber are placed in heat sealing machine, their fibre core and inner cladding center of gravity are aimed at simultaneously, carries out fused fiber splice.
Optimally, two described optical fiber inner claddings are respectively circular and octagon.
Further, the optical fiber that described inner cladding is circle is ground.
Optimally, two described fiber cores are circle and consistent size.
Optimally, two described optical fiber are all Active Optical Fibers, are all passive fiber or one for Active Optical Fiber one is passive fiber.
Because technique scheme is used, the present invention compared with prior art has following advantages: the optical fiber splicing method of the ultralow light loss of the present invention, micrometering is utilized to obtain the fibre core of optical fiber and the side-play amount of inner cladding center of gravity and offset direction, thus the inner cladding of a wherein optical fiber is ground, can guarantee that inner cladding center of gravity and fibre core are aimed at simultaneously, after making fused fiber splice, fibre core still keeps accurate alignment, significantly reduce the light loss of this fusion point, light scattering, the heating that light reflection and light absorption cause, improve the optical continuity of this fusion point, thus the requirement reduced this fusion point package cooling, reduce and the potential damage of other optical element in fiber ring laser system is threatened.
Accompanying drawing explanation
Accompanying drawing 1 is circular doubly clad optical fiber schematic cross-section eccentric in the present invention;
Accompanying drawing 2 is octagon doubly clad optical fiber schematic cross-section eccentric in the present invention;
Accompanying drawing 3 is that circle eccentric in the present invention and octagon doubly clad optical fiber carry out the inner cladding relative position after fibre core aligning and inner cladding center of gravity schematic diagram;
Accompanying drawing 4 is that inner cladding center of gravity after grinding round fiber inner cladding overlaps with the inner cladding center of gravity of octagon doubly clad optical fiber schematic diagram;
Accompanying drawing 5 is the process flow diagram of the optical fiber splicing method of the ultralow light loss of the present invention;
Wherein: 1, circular doubly clad optical fiber fibre core; 2, circular doubly clad optical fiber inner cladding; 3, circular doubly clad optical fiber coat; 4, octagon doubly clad optical fiber fibre core; 5, octagon doubly clad optical fiber inner cladding; 6, octagon doubly clad optical fiber coat; 7, circular doubly clad optical fiber inner cladding center of gravity; 8, octagon doubly clad optical fiber inner cladding center of gravity; 9, the fiber core after aiming at; The inner cladding center of gravity of 10, aiming at after grinding.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the invention is described in detail:
As shown in Figure 1-2, the optical fiber choosing two kinds of specifications carries out welding, and wherein an optical fiber is circular passive doubly clad optical fiber, and its fibre core 1 diameter is 25 microns, and inner cladding 2 diameter is 250 microns, and coat 3 diameter is 400 microns, and fibre core is without gain ion doping; Another root optical fiber is active double clad fiber, and its fibre core 4 diameter is 25 microns, and inner cladding 5 is octagons, and the parallel edge-to-edge's distance of octagonal profile is 250 microns, and coat 6 diameter is 400 microns.In order to the optical fiber of these two kinds of specifications is carried out welding, first remove the coat of two kinds of optical fiber within the scope of welding area 6cm with hot soarfing division, carry out ends cutting.Two optical fiber are put into large core fiber heat sealing machine, carries out micrometering with end view pattern (EndView pattern) end face to two optical fiber and obtain the fibre core of optical fiber and the side-play amount of inner cladding center of gravity and offset direction.Record in the above-mentioned optical fiber chosen, the fibre core 1 of round fiber is 6 microns relative to departing from of inner cladding 2 center, and the fibre core 4 of octagon optical fiber is 3 microns relative to departing from of octagon inner cladding 5 center, and their centrifugal directions are in 80 degree of angles.
Aim at then welding according to fibre core, in this case, before welding, fibre core 9 is aim at really, but round fiber inner cladding center of gravity 7 and octagon optical fiber inner cladding center of gravity 8 stagger, as shown in Figure 3.In fusion process, due to the inner cladding surface tension in the molten state of two optical fiber dislocation, a draw can be produced, this tractive force can cause the inner cladding center of gravity of two optical fiber close to each other, the fibre core aimed at before making welding creates departing from of 2-6 micron after fusing, and concrete side-play amount is different according to the difference of two fiber core offset direction angles.The optical fiber fusion welding point of this decentraction can produce negative impact under the applicable cases of high power laser, form large luminous power absorption, scattering or reflection, finally cause high power fiber laser in the heating of this fusion point, launch increase, job insecurity, inefficacy, even burn.
In the present embodiment, as shown in Figure 5, the optical fiber splicing method of employing is: remove the coat of two kinds of optical fiber within the scope of welding area 6cm with hot soarfing division, carry out fiber end face cutting; Then respectively micrometering is carried out to the end face of two optical fiber, determine side-play amount and the offset direction of their fibre cores and inner cladding center of gravity; The fibre core of two optical fiber is aimed at, rotates a wherein optical fiber and make the bias of two fiber cores in same direction, now difference 3 microns between their inner cladding center of gravity, as shown in Figure 3.According to the centre of gravity place of formula survey calculation two optical fiber inner claddings below, then determine that fibre core departs from the Distance geometry angle of inner cladding center of gravity: center of gravity calculation formula:
with
if two is all passive fiber, that root optical fiber just choosing fibre core bias large grinds; If an optical fiber is Active Optical Fiber, grind with regard to selecting passive fiber.Determine to grind direction and amount of grinding: grinding direction is the line direction of fibre core and inner cladding center of gravity, amount of grinding carries out after numerical evaluation makes grinding, and the fibre core of this optical fiber and the distance of inner cladding center of gravity are equal with another root optical fiber.And " fibre core-inner cladding center of gravity " line bearing mark of two optical fiber, in the surface of optical fiber, is convenient to the aligning before welding.Optic fiber polishing machine grinds optical fiber outside their inner claddings, equal control grinding rate and amount of grinding, finally makes the inner cladding center of gravity of two optical fiber equal from the distance of respective fibre core.Finally these two optical fiber are placed in heat sealing machine, their fibre core and inner cladding center of gravity are aimed at simultaneously, carries out fused fiber splice.
As shown in Figure 4, now two fiber cores and inner cladding keep the state of aligning simultaneously, avoid the pulling phenomenon produced in fusion process due to the departing from of inner cladding center of gravity of two optical fiber, before welding He after welding, all ensure that fibre core is in alignment.The fused fiber splice that this method is carried out significantly reduces the light loss of this fusion point, the light loss of fusion point stably controls at below 0.1dB in the present embodiment, add the optical continuity of optical fiber at this fusion point, decrease and the potential damage of other optical element in fiber ring laser system is threatened, reduce the probability of this fusing point heating damage and the requirement of package cooling.
The welding that the accurate fibre core that the present invention is equally applicable to single cladded-fiber is aimed at.
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 (5)
1. an optical fiber splicing method for ultralow light loss, is characterized in that: it comprises the following steps:
(a) pre-service: remove the coat of two optical fiber in welding area with hot soarfing division;
B () micrometering: carry out micrometering to the end face of two optical fiber respectively, obtains the fibre core of optical fiber and the side-play amount of inner cladding end face center of gravity and offset direction;
C () grinds: according to side-play amount and the offset direction of the fibre core obtained in step (b) and inner cladding end face center of gravity, the inner cladding end face centre of gravity place of optical fiber is calculated by following center of gravity calculation formula (1) and formula (2), determine that fibre core departs from the Distance geometry angle of inner cladding end face center of gravity, then optic fiber polishing machine is utilized to grind outside its inner cladding along fibre core and inner cladding end face center of gravity line direction a wherein optical fiber, until the inner cladding center of gravity of two optical fiber and fibre core spacing are from identical, and by " fibre core-inner cladding center of gravity " line bearing mark of two optical fiber in the surface of optical fiber,
(1) and
(2),
In formula,
with
the coordinate of center of gravity,
it is the two-dimensional space region of inner cladding end face;
D () aims at welding: these two optical fiber are placed in heat sealing machine, their fibre core and inner cladding center of gravity are aimed at simultaneously, carries out fused fiber splice.
2. the optical fiber splicing method of ultralow light loss according to claim 1, is characterized in that: two described optical fiber inner claddings are respectively circular and octagon.
3. the optical fiber splicing method of ultralow light loss according to claim 2, is characterized in that: grind the optical fiber that described inner cladding is circle.
4. the optical fiber splicing method of ultralow light loss according to claim 1, is characterized in that: two described fiber cores are circle and consistent size.
5. the optical fiber splicing method of ultralow light loss according to claim 1, is characterized in that: two described optical fiber are all Active Optical Fibers, are all passive fiber or one for Active Optical Fiber one is passive fiber.
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| CN201310530943.0A CN103529517B (en) | 2013-10-31 | 2013-10-31 | The optical fiber splicing method of ultralow light loss |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5218184A (en) * | 1991-01-08 | 1993-06-08 | Alcatel Fibres Optiques | Arc fusion splicer for optical fibers utilizing low and high accuracy displacement means |
| CN1462891A (en) * | 2003-06-13 | 2003-12-24 | 上海理工大学 | Mass center method for adjusting core making automatic end to end joint for wave-guide and optical fiber |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000221365A (en) * | 1999-02-02 | 2000-08-11 | Mitsubishi Electric Corp | Optical connector for polarization plane maintaining type optical fiber |
| JP2005352168A (en) * | 2004-06-10 | 2005-12-22 | Fujikura Ltd | Alignment method of optical fiber, butting device of optical fiber and fusion splicer of optical fiber |
| CN101806934B (en) * | 2010-03-29 | 2012-08-22 | 哈尔滨工程大学 | Inner wall fused and embedded single-mode polarization maintaining fiber grating and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5218184A (en) * | 1991-01-08 | 1993-06-08 | Alcatel Fibres Optiques | Arc fusion splicer for optical fibers utilizing low and high accuracy displacement means |
| CN1462891A (en) * | 2003-06-13 | 2003-12-24 | 上海理工大学 | Mass center method for adjusting core making automatic end to end joint for wave-guide and optical fiber |
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