CN103529517A - Ultralow-optical-loss fiber splicing method - Google Patents
Ultralow-optical-loss fiber splicing method Download PDFInfo
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- CN103529517A CN103529517A CN201310530943.0A CN201310530943A CN103529517A CN 103529517 A CN103529517 A CN 103529517A CN 201310530943 A CN201310530943 A CN 201310530943A CN 103529517 A CN103529517 A CN 103529517A
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Abstract
The invention relates to an ultralow-optical-loss fiber splicing method which comprises the steps as follows: a), pretreatment: a coating layer is removed with a hot stripping method; b), microscopic measurement: offsets and offset directions of cores of optical fibers and the gravity centers of inner coating layers are obtained; c), grinding: the inner coating layers of the optical fibers are ground in connection line directions of the fiber cores and the gravity centers of the inner coating layers; and d), alignment welding. According to the method, the offsets and the offset directions of the cores of the optical fibers and the gravity centers of the inner coating layers are obtained through microscopic measurement, so that an inner coating layer of one optical fiber is ground, the gravity center of the inner coating layer and a core of the optical fiber are aligned to each other simultaneously, the fiber cores still keep accurate alignment states after fiber splicing, heat caused by optical loss, light scattering, light reflection and light absorption of splicing points is reduced effectively; and the optical continuity of the splicing points is improved, the packaging and heat radiation requirements for the splicing points are reduced, and potential damage and threats to other optical elements in an optical fiber laser system are reduced.
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, for the quality of optical fiber fusion welding point, high requirement has been proposed.The fiber core mismatch of optical fiber fusion welding point or other flaw all can cause local heating, even cause this fusion point to burn or damage because light reflection causes the optical element of fiber ring laser system the inside.
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, alignment so is: core is aimed at, covering is aimed at, and view mode is: side is observed and end face is observed.But all these modes still can not realize high-quality core diameter and aim at welding, reason is each different optical fiber producer, the different model of same producer, in the different batches of same model, fibre core has the centrifugal skew (being that fibre core is eccentric) of different depths with respect to inner cladding.When we aim at according to covering mode, its fibre core can have dislocation; When we aim at according to fibre core mode, on surface, seem fibre core to aim at, actually this is not so.Because 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, amplitude difference, direction that the fibre core of both sides optical fiber departs from inner cladding center of gravity are different, make two melting coverings with transversion malposition under capillary draw, the fibre core of originally having aimed at 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 ultralow light loss optical fiber splicing method that provides a kind of accurate fibre core to aim in order to overcome the deficiencies in the prior art is provided.
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: respectively the end face of two optical fiber is carried out to micrometering, obtain the fibre core of optical fiber and side-play amount and the offset direction of inner cladding center of gravity;
(c) grind: according to side-play amount and the offset direction of the fibre core obtaining in step (b) and inner cladding center of gravity, by following center of gravity calculation formula (1) and formula (2), calculate the inner cladding centre of gravity place of optical fiber, determine that fibre core departs from distance and the angle of inner cladding center of gravity, then utilize optic fiber polishing machine along fibre core and inner cladding center of gravity line direction, an optical fiber inner cladding wherein to be ground, until the inner cladding center of gravity of two optical fiber with fibre core spacing 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,
with
the coordinate of center of gravity,
it is the two-dimensional space region of fibre core;
(d) aim at welding: these two optical fiber are placed in to heat sealing machine, their fibre core and inner cladding center of gravity are aimed at simultaneously, carry out fused fiber splice.
Optimally, two described optical fiber inner claddings are respectively circle and octagon.
Further, to described inner cladding, be that circular optical fiber grinds.
Optimally, two described fiber cores are circle and consistent size.
Optimally, two described optical fiber be all Active Optical Fiber, be all passive fiber or one for one of Active Optical Fiber be 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, utilize micrometering to obtain the fibre core of optical fiber and side-play amount and the offset direction of inner cladding center of gravity, thereby the inner cladding of an optical fiber is wherein ground, can guarantee that inner cladding center of gravity and fibre core aim at simultaneously, after making fused fiber splice, fibre core still keeps accurate alignment, effectively reduced the light loss of this fusion point, light scattering, the heating that light reflection and light absorption cause, improved the optics continuity of this fusion point, thereby reduce the requirement to this fusion point package cooling, reduced the potential damage of other optical element in fiber ring laser system to threaten.
Accompanying drawing explanation
Accompanying drawing 2 is octagon doubly clad optical fiber schematic cross-section eccentric in the present invention;
Accompanying drawing 3 is that circle and octagon doubly clad optical fiber eccentric in the present invention carries out inner cladding relative position and the inner cladding center of gravity schematic diagram after fibre core aligning;
The process flow diagram of the optical fiber splicing method that accompanying drawing 5 is 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 aligning; 10, grind rear inner cladding center of gravity of aiming at.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the invention is elaborated:
As shown in Figure 1-2, the optical fiber of 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 diameters are 250 microns, and coat 3 diameters are 400 microns, and fibre core is without gain ion doping; Another root optical fiber is active doubly clad optical fiber, and its fibre core 4 diameters are 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 diameters are 400 microns.For the optical fiber of these two kinds of specifications is carried out to welding, first with hot soarfing division, remove the coat of two kinds of optical fiber within the scope of welding area 6cm, carry out ends cutting.Two optical fiber are put into large core fiber heat sealing machine, by end face observing pattern (End view mode), the end face of two optical fiber is carried out to micrometering and obtain the fibre core of optical fiber and side-play amount and the offset direction of inner cladding center of gravity.Record in the above-mentioned optical fiber of choosing, the fibre core 1 of round fiber is 6 microns with respect to departing from of inner cladding 2 centers, and the fibre core 4 of octagon optical fiber is 3 microns with respect to departing from of octagon inner cladding 5 centers, and their centrifugal directions are in 80 degree angles.
If adopt fibre core to aim at then welding, in this case, before welding, fibre core 9 is aimed at really, however 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 of the two optical fiber dislocation surface tension under molten condition, can produce a draw, this tractive force can cause the inner cladding center of gravity of two optical fiber mutually close, make the fibre core of aiming at before welding after welding, produce departing from of 2-6 micron, concrete side-play amount is according to the difference of two fiber core offset direction angles and difference.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 at this fusion point, to generate heat, launch increase, job insecurity, inefficacy, even burn.
In the present embodiment, as shown in Figure 5, the optical fiber splicing method of employing is: with hot soarfing division, remove the coat of two kinds of optical fiber within the scope of welding area 6cm, carry out fiber end face cutting; Then respectively the end face of two optical fiber is carried out to micrometering, 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, and a rotation wherein optical fiber makes the bias of two fiber cores in same direction, now between their inner cladding center of gravity, differs 3 microns, as shown in Figure 3.According to formula below, measure the centre of gravity place that calculates two optical fiber inner claddings, then determine that fibre core departs from distance and the angle of inner cladding center of gravity: center of gravity calculation formula:
with
.If two is all passive fiber, just chooses that root optical fiber that fibre core bias is large and grind; If an optical fiber is Active Optical Fiber, just select passive fiber to grind.Determine and 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 numerical evaluation and makes after grinding, the fibre core of this optical fiber and the distance of inner cladding center of gravity and equating of 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 along their inner claddings outsides, evenly controls grinding rate and amount of grinding, and the inner cladding center of gravity that finally makes two optical fiber equates from the distance of fibre core separately.Finally these two optical fiber are placed in to heat sealing machine, their fibre core and inner cladding center of gravity are aimed at simultaneously, carry out fused fiber splice.
As shown in Figure 4, now two fiber cores and inner cladding keep the state of aiming at simultaneously, have avoided the pulling phenomenon that produces in fusion process due to the departing from of inner cladding center of gravity of two optical fiber, before welding He after welding, all guarantee that fibre core is in alignment.The fused fiber splice that this method is carried out has reduced the light loss of this fusion point effectively, the light loss of fusion point is stably controlled at below 0.1dB in the present embodiment, increased the optics continuity of optical fiber at this fusion point, reduced the potential damage of other optical element in fiber ring laser system has been threatened, reduced the probability of this fusing point heating damage and the requirement of package cooling.
The present invention is equally applicable to the welding of the accurate fibre core aligning of single cladded-fiber.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in 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: respectively the end face of two optical fiber is carried out to micrometering, obtain the fibre core of optical fiber and side-play amount and the offset direction of inner cladding center of gravity;
(c) grind: according to side-play amount and the offset direction of the fibre core obtaining in step (b) and inner cladding center of gravity, by following center of gravity calculation formula (1) and formula (2), calculate the inner cladding centre of gravity place of optical fiber, determine that fibre core departs from distance and the angle of inner cladding center of gravity, then utilize optic fiber polishing machine along fibre core and inner cladding center of gravity line direction, an optical fiber inner cladding wherein to be ground, until the inner cladding center of gravity of two optical fiber with fibre core spacing 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,
with
the coordinate of center of gravity,
it is the two-dimensional space region of fibre core;
(d) aim at welding: these two optical fiber are placed in to heat sealing machine, their fibre core and inner cladding center of gravity are aimed at simultaneously, carry 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 circle and octagon.
3. the optical fiber splicing method of ultralow light loss according to claim 2, is characterized in that: to described inner cladding, be that circular optical fiber grinds.
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 be all Active Optical Fiber, be all passive fiber or one for one of Active Optical Fiber be passive fiber.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN201310530943.0A CN103529517B (en) | 2013-10-31 | 2013-10-31 | The optical fiber splicing method of ultralow light loss |
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Citations (5)
| 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 |
| JP2000221365A (en) * | 1999-02-02 | 2000-08-11 | Mitsubishi Electric Corp | Optical connector for polarization plane maintaining type optical fiber |
| 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 |
| CN1707296A (en) * | 2004-06-10 | 2005-12-14 | 株式会社藤仓 | Method for aligning optical fibre, optical fibre aligning apparatus and optical fibre fusion splicer |
| CN101806934A (en) * | 2010-03-29 | 2010-08-18 | 哈尔滨工程大学 | Inner wall fused and embedded single-mode polarization maintaining fiber grating and preparation method thereof |
-
2013
- 2013-10-31 CN CN201310530943.0A patent/CN103529517B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
| JP2000221365A (en) * | 1999-02-02 | 2000-08-11 | Mitsubishi Electric Corp | Optical connector for polarization plane maintaining type optical fiber |
| 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 |
| CN1707296A (en) * | 2004-06-10 | 2005-12-14 | 株式会社藤仓 | Method for aligning optical fibre, optical fibre aligning apparatus and optical fibre fusion splicer |
| CN101806934A (en) * | 2010-03-29 | 2010-08-18 | 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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