CN104777552B - A kind of double-cladding active optical fiber and its manufacture method - Google Patents
A kind of double-cladding active optical fiber and its manufacture method Download PDFInfo
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- CN104777552B CN104777552B CN201510155189.6A CN201510155189A CN104777552B CN 104777552 B CN104777552 B CN 104777552B CN 201510155189 A CN201510155189 A CN 201510155189A CN 104777552 B CN104777552 B CN 104777552B
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
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- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
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Abstract
The invention discloses a kind of double-cladding active optical fiber and its manufacture method, this method comprises the following steps：S1：Prepare preform presoma；S2：Quartzy cold working is carried out to silica clad, circular hole is bored on silica clad；S3：Prepare disc waveguide prefabricated rods；S4：Disc waveguide prefabricated rods are assembled to circular hole, form active preform；S5：To Active Optical Fiber prefabricated stick drawn wire, double-cladding active optical fiber is formed.The silica clad of double-cladding active optical fiber is D-shaped or regular polygon；Disc waveguide fibre core is provided with silica clad, disc waveguide fibre core spiral surrounding is surrounded with 0.5~120 spiral around silica core in every meter of silica core.Machining accuracy of the present invention is high, and manufacture difficulty is relatively low；When manufacturing double-cladding active optical fiber, it can be easier to make disc waveguide fibre core be surrounded on around silica core, ensure the optical property and reliability of double-cladding active optical fiber.
Description
Technical field
The present invention relates to rare earth doped fiber, optical-fiber laser transmission and amplification sector, and in particular to a kind of double-cladding active light
Fine and its manufacture method.
Background technology
Optical fiber laser is to use laser of the optical fiber as fiber medium, and optical fiber laser is with its high conversion efficiency, good
The characteristics of good heat dispersion and stability, it has also become one of the main flow laser in laser application field.
With the continuous extension in laser application field, demand more and more higher of the user to optical fiber laser power output.
At present, people typically lift the power output of optical fiber laser using big mode field area fibers, due in mould field fiber core
Zlasing mode vibration beam quality can be caused to decline；Therefore in order to optimize beam quality, being usually taken reduces fiber core
The mode of numerical aperture, but the decline of fiber core numerical aperture can cause optical fiber beam to tie up ability decline, be unfavorable for fibre-optical bending
Use, and the numerical aperture that existing process level can be realized reduces limited extent.
With the progress in epoch, it has been found that certain waveguiding structure is designed near Active Optical Fiber fibre core, and (double clad has
Source optical fiber), while can realize big mode field area optic fibre characteristic, realize the single-mode output of laser fiber.
Waveguide (i.e. satellite fibre of the existing double-cladding active optical fiber generally use circular waveguide as high-order mode couple leak
Core)；Because satellite fibre core needs at regular intervals with Active Optical Fiber fibre core, therefore satellite fibre core is in preparation process, to active
The diameter to be drilled on preform has higher requirements with depth, so cause satellite fibre core design flexibility receive it is larger
Limitation.At the same time, the aperture of satellite fibre core can cause diameter smaller, and it is relatively difficult in turn result in the processing of preform,
Machining accuracy can decline.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of double-cladding active optical fiber and its system
Make method.Not only machining accuracy is high by the present invention, and processing technology is more stable, and manufacture difficulty is relatively low, and operating efficiency is higher, fits
Close high-volume, large-scale production.When manufacturing double-cladding active optical fiber by the method for the present invention, it can be easier to make circumferential wave
Lead fibre core to be surrounded on around silica core, the position control difficulty of disc waveguide fibre core is relatively low, and process is fairly simple, double-contracting
The optical property and reliability of layer Active Optical Fiber are preferable.
To achieve the above objectives, the manufacture method of double-cladding active optical fiber provided by the invention, comprises the following steps：
S1：The prefabricated rod mandrel of double-cladding active optical fiber is prepared, prefabricated rod mandrel and quartz are processed, forms optical fiber
Prefabricated rods presoma；The prefabricated rods presoma includes silica core, doped with Yb, Tm, Ho, F, P and Ge in silica core
At least one element；The numerical aperture of the silica core is 0.05~0.15, and the outside of silica core is covered with a diameter of
30mm~200mm silica clad；The diameter of the silica clad is 10~40 with the ratio of silica core diameter, goes to step
S2；
S2：Quartzy cold working is carried out to silica clad, obtains the silica clad of D-shaped or regular polygon；Pass through Digit Control Machine Tool
Silica clad is drilled, obtains the spacing of circular hole, circular hole and silica core, with the ratio of silica core radius for 0.1~
4.0, go to step S3；
S3：Disc waveguide prefabricated rods are prepared, disc waveguide prefabricated rods include disc waveguide fibre core, quartzy surrounding layer and quartz
Inner cladding；The refractive index of disc waveguide fibre core is higher than quartzy surrounding layer and quartzy inner cladding；Disc waveguide fibre core and quartzy outsourcing
The percentage of layer refringence is 0.1%~1.1%；The thickness of disc waveguide fibre core is 0.2 with silica core 1a diameter ratio
~1.5；Quartzy surrounding layer is processed so that the fit tolerance of quartzy surrounding layer and the circular hole of prefabricated rods presoma is less than
0.3mm, go to step S4；
S4：Disc waveguide prefabricated rods are assembled to the circular hole of preform presoma, form active preform, are turned
To step S5；
S5：It is 1.5m/min~20m/min in drawing speed, under conditions of drawing tensile force is 40g~150g, by active light
Fine prefabricated rods carry out wire drawing；In drawing process, Active Optical Fiber prefabricated rods are rotated with 1r/min~180r/min speed, by ring
Shape waveguide prefabricated rods spiral surrounding is surrounded with 0.5~120 spiral around silica core in every meter of silica core；In wire drawing
Outside postrotational Active Optical Fiber prefabricated rods, low refractive index coating and the outer overlay of optical fiber are coated successively, forming double clad has
Source optical fiber；The refractive index of the low refractive index coating is less than silica clad, and low refractive index coating is 1.33 in 633nm refractive index
~1.38.
On the basis of above-mentioned technical proposal, when the prefabricated rod mandrel of double-cladding active optical fiber is prepared in step S1, use
Modified chemical vapor deposition method MCVD or plasma activation chemical vapor deposition method PCVD method.
On the basis of above-mentioned technical proposal, when prefabricated rod mandrel and quartz being processed in step S1, processing mode
For deposition covering or coordinate quartzy tubing collapsing, deposit the mode of covering for rod outer chemical vapor deposition method OVD or wait from
Daughter vapour deposition process.
On the basis of above-mentioned technical proposal, after obtaining circular hole in step S2, it is also necessary to which circular hole is polished.
When disc waveguide prefabricated rods are prepared on the basis of above-mentioned technical proposal, in step S3, using MCVD, PCVD or
OVD method.
Quartzy surrounding layer is processed on the basis of above-mentioned technical proposal, in step S3 and comprised the following steps：Using
After the method for peripheral milling is ground the thickness of quartzy surrounding layer, quartzy surrounding layer is polished.
On the basis of above-mentioned technical proposal, the output beam quality of double-cladding active optical fiber is less than described in step S5
1.2, fundamental mode loss is less than 0.5dB/m, and high-order mode loss is more than 100dB/m.
Double-cladding active optical fiber provided by the invention based on above-mentioned manufacture method, the double-cladding active optical fiber include by
It is interior to overlay outside the silica core set gradually outside, silica clad, low refractive index coating and optical fiber；The silica clad is D
Shape or regular polygon；The refractive index of the low refractive index coating is less than silica clad, refraction of the low refractive index coating in 633nm
Rate is 1.33~1.38；
Disc waveguide fibre core is provided with the silica clad, disc waveguide fibre core spiral surrounding around silica core,
0.5~120 spiral is surrounded with every meter of silica core.
On the basis of above-mentioned technical proposal, the output beam quality of the double-cladding active optical fiber is less than 1.2, basic mode damage
Consumption is less than 0.5dB/m, and high-order mode loss is more than 100dB/m.
Compared with prior art, the advantage of the invention is that：
(1) mode for coordinating disc waveguide optical wand to combine with groove at side surface in the prior art is compared, and the present invention is by existing
The general Digit Control Machine Tool of panda type polarization-preserving fiber and technique, circular hole is radially opened on the silica clad of Active Optical Fiber prefabricated rods,
It will be provided with the prefabricated rods insertion circular hole of disc waveguide structure, not only machining accuracy is high, and processing technology is more stable, draws in circular hole
The impurity content entered is less, and process is easier, and manufacturing cost is relatively low；The double-cladding active optical fiber produced can
It can be significantly improved by property and technology stability.
At the same time, due to the geometry that does not destroy outside preform when the present invention opens circular hole, thus do not deposit compared with
High-precision work pieces mate problem, and then (to be processed as D-shaped or just polygon when being subsequently processed silica clad optical wand
Shape), machining accuracy and reliability can be significantly improved.
(2) compared with satellite fibre core of the prior art, disc waveguide fibre core of the invention is prepared and is easier, in annular
During waveguide prefabricated rods, it is only necessary to the quartzy surrounding layer of disc waveguide prefabricated rods is processed (grinding), it is not necessary to enter
The complicated regular polygon grinding of row, workload and the requirement of grinding significantly reduce.Therefore, double-contracting is manufactured by the method for the present invention
During layer Active Optical Fiber, not only manufacture difficulty is relatively low, and operating efficiency is higher, is adapted to high-volume, large-scale production.
(3) after disc waveguide prefabricated rods are embedded in circular hole by the present invention, the disc waveguide fibre core of disc waveguide prefabricated rods, all the time
Fixed distance and coplanar (two circular edges are apart from constant) is kept with Active Optical Fiber fibre core (silica core), and then is caused
In wire drawing, disc waveguide fibre core accurately can be surrounded on around silica core disc waveguide prefabricated rods as desired.
Further, because disc waveguide prefabricated rods are between silica core, disc waveguide fibre core and silica core
Distance it is shorter, be easy to wire drawing.Therefore, when manufacturing double-cladding active optical fiber by the method for the present invention, can be easier to make
Disc waveguide fibre core is surrounded on around silica core, and the position control difficulty of disc waveguide fibre core is relatively low, not only process ratio
It is relatively simple, and machining accuracy is higher.
(4) by double-cladding active optical fiber made from the manufacture method of the present invention, including disc waveguide fibre core, due to annular
The area of waveguide is significantly greater than circular waveguide of the prior art, therefore the coupling efficiency of double-cladding active optical fiber can be carried significantly
It is high；The output beam quality of double-cladding active optical fiber is less than 1.2, and fundamental mode loss is less than 0.5dB/m, and high-order mode loss is more than
100dB/m；The optical property and reliability of double-cladding active optical fiber are preferable.
Brief description of the drawings
Fig. 1 is the flow chart of the manufacture method of double-cladding active optical fiber in the embodiment of the present invention；
Fig. 2 is the structural representation of preform presoma in the embodiment of the present invention；
Fig. 3 is the structural representation of disc waveguide prefabricated rods in the embodiment of the present invention；
Fig. 4 is the structural representation of Active Optical Fiber prefabricated rods in the embodiment of the present invention；
Fig. 5 is the schematic diagram of double-cladding active optical fiber end face in the embodiment of the present invention；
Fig. 6 is the structural representation of double-cladding active optical fiber in the embodiment of the present invention.
In figure：1- preform presomas, 1a- silica cores, 1b- silica clads, 1c- circular holes, 2- disc waveguides are pre-
Rod processed, 2a- quartz surrounding layers, 2b- disc waveguide fibre cores, 2c- quartz inner claddings, 3- Active Optical Fiber prefabricated rods, 4- optical fiber apply outside
Coating, 5- low refractive index coatings, 6- double-cladding active optical fibers.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
It is shown in Figure 1, the manufacture method of the double-cladding active optical fiber in the embodiment of the present invention, comprise the following steps：
S1：The prefabricated rod mandrel of double-cladding active optical fiber is prepared, prefabricated rod mandrel and quartz are processed, forms optical fiber
Prefabricated rods presoma 1.Shown in Figure 2, prefabricated rods presoma includes silica core 1a, doped with Yb in silica core 1a
At least one of (ytterbium), Tm (thulium), Ho (holmium), F (fluorine), P (phosphorus) and Ge (germanium) element.Silica core 1a numerical aperture is
0.05~0.15；Silica core 1a outside is covered with a diameter of 30mm~200mm silica clad 1b, silica clad 1b diameter
Ratio with silica core 1a diameters is 10~40, goes to step S2.
When the prefabricated rod mandrel of double-cladding active optical fiber is prepared in step S1, using MCVD (Modified Chemical
Vapour DepositiON, modified chemical vapor deposition method) or PCVD (Plasma activated Chemical
Vapour Deposition, plasma activation chemical vapor deposition method) method.
When being processed prefabricated rod mandrel and quartz in step S1, processing mode is deposition covering or coordinates quartz ampoule
Material collapsing, the mode for depositing covering are preferably OVD (Outside Chemical Vapour Deposition, rod outer chemical vapour
Phase sedimentation) or plasma vapor deposition processes.
S2：Quartzy cold working is carried out to silica clad 1b using numerically control grinder, obtains the silica clad of D-shaped or regular polygon
1b；Drilled by radial direction of the Digit Control Machine Tool along silica clad 1b, circular hole 1c is obtained, between circular hole 1c and silica core 1a
Away from the ratio with silica core 1a radiuses is 0.1~4.0；Go to step S3.
After obtaining circular hole 1c in step S2, it is also necessary to which circular hole 1c is polished.
S3：Prepare disc waveguide prefabricated rods 2, it is shown in Figure 3, disc waveguide prefabricated rods 2 include disc waveguide fibre core 2b,
Quartzy surrounding layer 2a and quartzy inner cladding 2c；Disc waveguide fibre core 2b refractive index is higher than quartzy surrounding layer 2a and quartzy inner cladding
2c.Disc waveguide fibre core 2b and the percentage of quartzy surrounding layer 2a refringences are 0.1%~1.1%；Disc waveguide fibre core 2b
Thickness and silica core 1a diameter ratio be 0.2~1.5.Quartzy surrounding layer 2a is processed so that quartzy surrounding layer 2a
It is less than 0.3mm with the circular hole 1c of prefabricated rods presoma fit tolerance, goes to step S4.
When disc waveguide prefabricated rods 2 are prepared in step S3, using MCVD, PCVD or OVD method.
Quartzy surrounding layer 2a is processed in step S3 and comprised the following steps：It is outer using the method grinding quartz of peripheral milling
After covering 2a thickness, quartzy surrounding layer 2a is polished.
S4：It is shown in Figure 4, disc waveguide prefabricated rods 2 are assembled to the circular hole 1c of preform presoma 1, formed
Active Optical Fiber prefabricated rods 3, go to step S5.
S5：It is 1.5m/min~20m/min in drawing speed, under conditions of drawing tensile force is 40g~150g, by active light
Fine prefabricated rods 3 carry out wire drawing；Referring to shown in Fig. 5 and Fig. 6, in drawing process, rotated with 1r/min~180r/min speed
Active Optical Fiber prefabricated rods 3, by the spiral surrounding of disc waveguide prefabricated rods 2 around silica core 1a, ring on every meter of silica core 1a
It is wound with 0.5~120 spiral.Outside wire drawing and postrotational Active Optical Fiber prefabricated rods 3, low refractive index coating 5 is coated successively
With overlay 4 outside optical fiber, double-cladding active optical fiber 6 is formed.The refractive index of low refractive index coating 5 is less than silica clad 1b, low folding
It is 1.33~1.38 that rate coating 5, which is penetrated, in 633nm refractive index.
Referring to shown in Fig. 5 and Fig. 6, the double-cladding active optical fiber 6 based on above-mentioned manufacture method in the present embodiment, including by interior
Overlay 4 outside to silica core 1a, silica clad 1b, low refractive index coating 5 and the optical fiber set gradually outside, silica clad 1b are
D-shaped or regular polygon, the refractive index of low refractive index coating 5 are less than silica clad 1b, folding of the low refractive index coating 5 in 633nm
Rate is penetrated as 1.33~1.38.Disc waveguide fibre core 2b is provided with silica clad 1b, disc waveguide fibre core 2b spiral surroundings are in stone
Around English fibre core 1a, 0.5~120 spiral is surrounded with every meter of silica core 1a.
The output beam quality of double-cladding active optical fiber 6 is less than 1.2, and fundamental mode loss is less than 0.5dB/m, and high-order mode loss is big
In 100dB/m.
The double-cladding active optical fiber and its manufacture method of the present invention is illustrated below by 5 embodiments.
Embodiment 1：Manufacture the double-cladding active optical fiber that beam quality is 1.01.
Step 101：The plug of Active Optical Fiber prefabricated rods 3 is prepared using MCVD method, optical fiber prefabricated rod mandrel passes through OVD
Preform presoma 1 is formed after process deposits covering, preform presoma 1 includes the silica core doped with Yb, P
1a, silica core 1a numerical aperture are 0.05.Silica core 1a outside is covered with a diameter of 52mm silica clad 1b, quartz
Covering 1b diameter is 10.0 with the ratio of silica core 1a diameters, goes to step 102.
Step 102：Quartzy cold working is carried out to silica clad 1b using numerically control grinder, silica clad 1b is ground to D-shaped,
D-shaped silica clad 1b straight flange and silica core 1a beeline are 14.2mm.Silica clad 1b is entered by Digit Control Machine Tool
Row drilling, the spacing for obtaining circular hole 1c, circular hole 1c and silica core 1a that aperture is 17mm are 2.6mm, and circular hole 1c and quartz are fine
Core 1a spacing and the ratio of silica core 1a radiuses are 1.0, go to step 103.
Step 103：Disc waveguide prefabricated rods 2 are prepared using PCVD method, disc waveguide prefabricated rods 2 include disc waveguide
Fibre core 2b, quartzy surrounding layer 2a and quartzy inner cladding 2c；Disc waveguide fibre core 2b and the percentage of quartzy surrounding layer 2a refringences
Than for 0.1%, thickness 5.2mm；Disc waveguide fibre core 2b thickness is 1.0 with silica core 1a diameter ratio.Quartzy outsourcing
Layer 2a external diameter be 16.05mm, use the cylindrical grinding machine tool of numerical control to be ground quartzy surrounding layer 2a and be polished to external diameter for
16.55mm, quartzy surrounding layer 2a and the circular hole 1c of prefabricated rods presoma fit tolerance are 0.23mm, go to step 104.
Step 104：Disc waveguide prefabricated rods 2 are assembled to the circular hole 1c of preform presoma 1, form Active Optical Fiber
Prefabricated rods 3, go to step 105.
Step 105：It is 20m/min in drawing speed, under conditions of drawing tensile force is 150g, by Active Optical Fiber prefabricated rods 3
Carry out wire drawing；In drawing process, with 10r/min speed rotation Active Optical Fiber prefabricated rods 3, by the spiral shell of disc waveguide prefabricated rods 2
Rotation is surrounded on around silica core 1a, there is 0.5 spiral around every meter of silica fibre.It is pre- in wire drawing and postrotational Active Optical Fiber
Outside rod 3 processed, coating low refractive index coating 5 of the refractive index less than silica clad 1b successively, (low refractive index coating 5 is 633nm's
1.33) and the outer overlay 4 of the higher optical fiber of modulus of elasticity refractive index is, to form double-cladding active optical fiber 6.
Empirical tests draw, a diameter of the 248 of the outer overlay 4 of optical fiber for the double-cladding active optical fiber 6 that embodiment 1 is prepared
μm, a diameter of 130 μm of silica clad 1b, operating central wavelength 1081.02nm, silica clad 1b and low refractive index coating 5
Numerical aperture be 0.52, beam quality 1.01, covering absorption coefficient be 1.77dB/m, fundamental mode loss 0.11dB/m, height
Rank mode loss is 136dB/m.
Embodiment 2：Manufacture the double-cladding active optical fiber 6 that beam quality is 1.03.
Step 201：The plug of Active Optical Fiber prefabricated rods 3, optical fiber prefabricated rod mandrel process etc. are prepared using MCVD method
Form preform presoma 1 after gas ions vapour deposition process deposition covering, preform presoma 1 include doped with
Yb, P, F and Ge silica core 1a, silica core 1a numerical aperture are 0.15.Silica core 1a outside is covered with a diameter of
52mm silica clad 1b, silica clad 1b diameter are 40.0 with the ratio of silica core 1a diameters, go to step 202.
Step 202：Quartzy cold working is carried out to silica clad 1b using numerically control grinder, silica clad 1b is ground to D-shaped,
D-shaped silica clad 1b straight flange and silica core 1a beeline are 14.6mm.Silica clad 1b is entered by Digit Control Machine Tool
Row drilling, the spacing for obtaining circular hole 1c, circular hole 1c and silica core 1a that aperture is 20mm are 2.6mm, and circular hole 1c and quartz are fine
Core 1a spacing and the ratio of silica core 1a radiuses are 4.0, go to step 203.
Step 203：Disc waveguide prefabricated rods 2 are prepared using MCVD method, disc waveguide prefabricated rods 2 include disc waveguide
Fibre core 2b, quartzy surrounding layer 2a and quartzy inner cladding 2c；Disc waveguide fibre core 2b and the percentage of quartzy surrounding layer 2a refringences
Than for 0.56%, thickness 1.95mm；Disc waveguide fibre core 2b thickness is 1.5 with silica core 1a diameter ratio.It is quartzy outer
Covering 2a external diameter is 17.10mm, use the cylindrical grinding machine tool of numerical control to be ground quartzy surrounding layer 2a and be polished to external diameter for
19.80mm, quartzy surrounding layer 2a and the circular hole 1c of prefabricated rods presoma fit tolerance are 0.1mm, go to step 204.
Step 204：Disc waveguide prefabricated rods 2 are assembled to the circular hole 1c of preform presoma 1, form Active Optical Fiber
Prefabricated rods 3, go to step 205.
Step 205：It is 1.5m/min in drawing speed, under conditions of drawing tensile force is 150g, by Active Optical Fiber prefabricated rods 3
Carry out wire drawing；In drawing process, with 1.0r/min speed rotation Active Optical Fiber prefabricated rods 3, by the spiral shell of disc waveguide prefabricated rods 2
Rotation is surrounded on around silica core 1a, there is 0.67 spiral around every meter of silica fibre.In wire drawing and postrotational Active Optical Fiber
Outside prefabricated rods 3, coating low refractive index coating 5 of the refractive index less than silica clad 1b successively, (low refractive index coating 5 is in 633nm
Refractive index 1.36) and the outer overlay 4 of the higher optical fiber of modulus of elasticity, to form double-cladding active optical fiber 6.
Empirical tests draw, a diameter of the 563 of the outer overlay 4 of optical fiber for the double-cladding active optical fiber 6 that embodiment 2 is prepared
μm, a diameter of 402 μm of silica clad 1b, operating central wavelength 1081.60nm, silica clad 1b and low refractive index coating 5
Numerical aperture be 0.46, beam quality 1.03, covering absorption coefficient be 2.42dB/m, fundamental mode loss 0.31dB/m, height
Rank mode loss is 145dB/m.
Embodiment 3：Manufacture the double-cladding active optical fiber 6 that beam quality is 1.01.
Step 301：The plug of Active Optical Fiber prefabricated rods 3 is prepared using PCVD method, optical fiber prefabricated rod mandrel is by set
Preform presoma 1 is formed after pipe collapsar technicses deposition covering, preform presoma 1 is included doped with Yb, P and Ge
Silica core 1a, silica core 1a numerical aperture is 0.13.Silica core 1a outside is covered with a diameter of 200mm quartz
Covering 1b, silica clad 1b diameter are 20.0 with the ratio of silica core 1a diameters, go to step 302.
Step 302：Quartzy cold working is carried out to silica clad 1b using numerically control grinder, silica clad 1b is ground to eight sides
Shape, octagon silica clad 1b inscribed circle diameter is 200mm.Silica clad 1b is drilled by Digit Control Machine Tool, obtained
Aperture is that 22.5mm circular hole 1c, circular hole 1c and silica core 1a spacing is 0.5mm, circular hole 1c and silica core 1a spacing
Ratio with silica core 1a radiuses is 0.1, goes to step 303.
Step 303：Disc waveguide prefabricated rods 2 are prepared using OVD method, disc waveguide prefabricated rods 2 include disc waveguide
Fibre core 2b, quartzy surrounding layer 2a and quartzy inner cladding 2c；Disc waveguide fibre core 2b and the percentage of quartzy surrounding layer 2a refringences
Than for 1.10%, thickness 2.0mm；Disc waveguide fibre core 2b thickness is 0.2 with silica core 1a diameter ratio.Quartzy outsourcing
Layer 2a external diameter be 21.0mm, use the cylindrical grinding machine tool of numerical control to be ground quartzy surrounding layer 2a and be polished to external diameter for
22.10mm, quartzy surrounding layer 2a and the circular hole 1c of prefabricated rods presoma fit tolerance are 0.2mm, go to step 304.
Step 304：Disc waveguide prefabricated rods 2 are assembled to the circular hole 1c of preform presoma 1, form Active Optical Fiber
Prefabricated rods 3, go to step 305.
Step 305：It is 18m/min in drawing speed, under conditions of drawing tensile force is 40g, Active Optical Fiber prefabricated rods 3 is entered
Row wire drawing；In drawing process, with 180r/min speed rotation Active Optical Fiber prefabricated rods 3, by the spiral of disc waveguide prefabricated rods 2
It is surrounded on around silica core 1a, there are 10 spirals around every meter of silica fibre.It is prefabricated in wire drawing and postrotational Active Optical Fiber
Outside rod 3, (folding of the low refractive index coating 5 in 633nm of low refractive index coating 5 that refractive index is less than silica clad 1b is coated successively
1.36) and the outer overlay 4 of the higher optical fiber of modulus of elasticity rate is penetrated, to form double-cladding active optical fiber 6.
Empirical tests draw, a diameter of the 561 of the outer overlay 4 of optical fiber for the double-cladding active optical fiber 6 that embodiment 3 is prepared
μm, a diameter of 405 μm of silica clad 1b, operating central wavelength 1081.40nm, silica clad 1b and low refractive index coating 5
Numerical aperture be 0.46, beam quality 1.01, covering absorption coefficient be 2.85dB/m, fundamental mode loss 0.28dB/m, height
Rank mode loss is 125dB/m.
Embodiment 4：Manufacture the double-cladding active optical fiber 6 that beam quality is 1.05.
Step 401：The plug of Active Optical Fiber prefabricated rods 3 is prepared using MCVD method, optical fiber prefabricated rod mandrel is by set
Preform presoma 1 is formed after pipe collapsar technicses deposition covering, preform presoma 1 is included doped with Tm's and P
Silica core 1a, silica core 1a numerical aperture are 0.12.Silica core 1a outside is covered with a diameter of 35mm quartz bag
Layer 1b, silica clad 1b diameter are 16.0 with the ratio of silica core 1a diameters, go to step 402.
Step 402：Quartzy cold working is carried out to silica clad 1b using numerically control grinder, silica clad 1b is ground to eight sides
Shape, octagon silica clad 1b inscribed circle diameter is 30mm.Silica clad 1b is drilled by Digit Control Machine Tool, obtains hole
Footpath is that 10.0mm circular hole 1c, circular hole 1c and silica core 1a spacing is 2.34mm, circular hole 1c and silica core 1a spacing
Ratio with silica core 1a radiuses is 2.5, goes to step 403.
Step 403：Disc waveguide prefabricated rods 2 are prepared using MCVD method, disc waveguide prefabricated rods 2 include disc waveguide
Fibre core 2b, quartzy surrounding layer 2a and quartzy inner cladding 2c；Disc waveguide fibre core 2b and the percentage of quartzy surrounding layer 2a refringences
Than for 0.35%, thickness 1.88mm；Disc waveguide fibre core 2b thickness is 1.0 with silica core 1a diameter ratio.It is quartzy outer
Covering 2a external diameter is 8.5mm, use the cylindrical grinding machine tool of numerical control to be ground quartzy surrounding layer 2a and be polished to external diameter for
9.6mm, quartzy surrounding layer 2a and the circular hole 1c of prefabricated rods presoma fit tolerance are 0.18mm, go to step 404.
Step 404：Disc waveguide prefabricated rods 2 are assembled to the circular hole 1c of preform presoma 1, form Active Optical Fiber
Prefabricated rods 3, go to step 405.
Step 405：It is 1.5m/min in drawing speed, under conditions of drawing tensile force is 100g, by Active Optical Fiber prefabricated rods 3
Carry out wire drawing；In drawing process, with 180r/min speed rotation Active Optical Fiber prefabricated rods 3, by the spiral shell of disc waveguide prefabricated rods 2
Rotation is surrounded on around silica core 1a, there is 120 spirals around every meter of silica fibre.It is pre- in wire drawing and postrotational Active Optical Fiber
Outside rod 3 processed, coating low refractive index coating 5 of the refractive index less than silica clad 1b successively, (low refractive index coating 5 is 633nm's
1.36) and the outer overlay 4 of the higher optical fiber of modulus of elasticity refractive index is, to form double-cladding active optical fiber 6.
Empirical tests draw, a diameter of the 560 of the outer overlay 4 of optical fiber for the double-cladding active optical fiber 6 that embodiment 4 is prepared
μm, a diameter of 404 μm of silica clad 1b, operating central wavelength 1936.80nm, silica clad 1b and low refractive index coating 5
Numerical aperture be 0.46, beam quality 1.05, covering absorption coefficient is 2.6dB/m, fundamental mode loss 0.30dB/m, high-order
Mode loss is 100dB/m.
Embodiment 5：Manufacture the double-cladding active optical fiber 6 that beam quality is 1.03.
Step 501：The plug of Active Optical Fiber prefabricated rods 3 is prepared using MCVD method, optical fiber prefabricated rod mandrel is by set
Preform presoma 1 is formed after pipe collapsar technicses deposition covering, preform presoma 1 includes the quartz doped with Ho
Fibre core 1a, silica core 1a numerical aperture are 0.09.Silica core 1a outside is covered with a diameter of 30mm silica clad 1b,
Silica clad 1b diameter is 10.0 with the ratio of silica core 1a diameters, goes to step 502.
Step 502：Quartzy cold working is carried out to silica clad 1b using numerically control grinder, silica clad 1b is ground to eight sides
Shape, octagon silica clad 1b inscribed circle diameter is 30mm.Silica clad 1b is drilled by Digit Control Machine Tool, obtains hole
Footpath is that 9.20mm circular hole 1c, circular hole 1c and silica core 1a spacing is 0.30mm, circular hole 1c and silica core 1a spacing
Ratio with silica core 1a radiuses is 0.2, goes to step 503.
Step 503：Disc waveguide prefabricated rods 2 are prepared using MCVD method, disc waveguide prefabricated rods 2 include disc waveguide
Fibre core 2b, quartzy surrounding layer 2a and quartzy inner cladding 2c；Disc waveguide fibre core 2b and the percentage of quartzy surrounding layer 2a refringences
Than for 1.10%, thickness 3.00mm；Disc waveguide fibre core 2b thickness is 1.0 with silica core 1a diameter ratio.It is quartzy outer
Covering 2a external diameter is 8.5mm, use the cylindrical grinding machine tool of numerical control to be ground quartzy surrounding layer 2a and be polished to external diameter for
9.0mm, quartzy surrounding layer 2a and the circular hole 1c of prefabricated rods presoma fit tolerance are 0.12mm, go to step 504.
Step 504：Disc waveguide prefabricated rods 2 are assembled to the circular hole 1c of preform presoma 1, form Active Optical Fiber
Prefabricated rods 3, go to step 505.
Step 505：It is 1.5m/min in drawing speed, under conditions of drawing tensile force is 120g, by Active Optical Fiber prefabricated rods 3
Carry out wire drawing；In drawing process, with 60r/min speed rotation Active Optical Fiber prefabricated rods 3, by the spiral shell of disc waveguide prefabricated rods 2
Rotation is surrounded on around silica core 1a, there is 40 spirals around every meter of silica fibre.It is pre- in wire drawing and postrotational Active Optical Fiber
Outside rod 3 processed, coating low refractive index coating 5 of the refractive index less than silica clad 1b successively, (low refractive index coating 5 is 633nm's
1.38) and the outer overlay 4 of the higher optical fiber of modulus of elasticity refractive index is, to form double-cladding active optical fiber 6.
Empirical tests draw, a diameter of the 565 of the outer overlay 4 of optical fiber for the double-cladding active optical fiber 6 that embodiment 5 is prepared
μm, a diameter of 402 μm of silica clad 1b, operating central wavelength 2142.20nm, silica clad 1b and low refractive index coating 5
Numerical aperture be 0.46, beam quality 1.03, covering absorption coefficient is 2.6dB/m, fundamental mode loss 0.14dB/m, high-order
Mode loss is 140dB/m.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (9)
1. a kind of manufacture method of double-cladding active optical fiber, it is characterised in that comprise the following steps：
S1：The prefabricated rod mandrel of double-cladding active optical fiber is prepared, prefabricated rod mandrel and quartz are processed, forms optical fiber prefabricating
Rod presoma (1)；The prefabricated rods presoma includes silica core (1a), doped with Yb, Tm, Ho, F, P in silica core (1a)
With at least one of Ge element；The numerical aperture of the silica core (1a) is 0.05~0.15, outside silica core (1a)
Portion is covered with a diameter of 30mm~200mm silica clad (1b)；The diameter of the silica clad (1b) is straight with silica core (1a)
The ratio in footpath is 10~40, goes to step S2；
S2：Quartzy cold working is carried out to silica clad (1b), obtains the silica clad (1b) of D-shaped or regular polygon；Pass through numerical control
Lathe drills to silica clad (1b), obtains the spacing of circular hole (1c), circular hole (1c) and silica core (1a), fine with quartz
The ratio of core (1a) radius is 0.1~4.0, goes to step S3；
S3：Disc waveguide prefabricated rods (2) are prepared, disc waveguide prefabricated rods (2) include disc waveguide fibre core (2b), quartzy surrounding layer
(2a) and quartzy inner cladding (2c)；The refractive index of disc waveguide fibre core (2b) is higher than quartzy surrounding layer (2a) and quartzy inner cladding
(2c)；Disc waveguide fibre core (2b) and the percentage of quartzy surrounding layer (2a) refringence are 0.1%~1.1%；Disc waveguide
The thickness of fibre core (2b) is 0.2~1.5 with the diameter ratio of silica core (1a)；Quartzy surrounding layer (2a) is processed so that
Quartzy surrounding layer (2a) and the fit tolerance of the circular hole (1c) of prefabricated rods presoma are less than 0.3mm, go to step S4；
S4：Disc waveguide prefabricated rods (2) are assembled to the circular hole (1c) of preform presoma (1), form active predispersed fiber
Rod (3) processed, goes to step S5；
S5：It is 1.5m/min~20m/min in drawing speed, it is under conditions of drawing tensile force is 40g~150g, Active Optical Fiber is pre-
Rod (3) processed carries out wire drawing；, will with 1r/min~180r/min speed rotation Active Optical Fiber prefabricated rods (3) in drawing process
Disc waveguide prefabricated rods (2) spiral surrounding is surrounded with 0.5~120 around silica core (1a) on every meter of silica core (1a)
Individual spiral；It is outside in wire drawing and postrotational Active Optical Fiber prefabricated rods (3), coat successively outside low refractive index coating (5) and optical fiber
Overlay (4), form double-cladding active optical fiber (6)；The refractive index of the low refractive index coating (5) is less than silica clad (1b),
Low refractive index coating (5) is 1.33~1.38 in 633nm refractive index.
2. the manufacture method of double-cladding active optical fiber as claimed in claim 1, it is characterised in that：Double clad is prepared in step S1
During the prefabricated rod mandrel of Active Optical Fiber, sunk using modified chemical vapor deposition method MCVD or plasma activation chemical vapor
Area method PCVD method.
3. the manufacture method of double-cladding active optical fiber as claimed in claim 1, it is characterised in that：By preform core in step S1
When rod is processed with quartz, processing mode is deposition covering or coordinates quartzy tubing collapsing, and the mode for depositing covering is rod
Outer chemical vapor deposition method OVD or plasma vapor deposition processes.
4. the manufacture method of double-cladding active optical fiber as claimed in claim 1, it is characterised in that：Circular hole is obtained in step S2
After (1c), it is also necessary to which circular hole (1c) is polished.
5. the manufacture method of double-cladding active optical fiber as claimed in claim 1, it is characterised in that：Circumferential wave is prepared in step S3
When leading prefabricated rods (2), using MCVD, PCVD or OVD method.
6. the manufacture method of double-cladding active optical fiber as claimed in claim 1, it is characterised in that：To quartzy outsourcing in step S3
Layer (2a), which is processed, to be comprised the following steps：After being ground the thickness of quartzy surrounding layer (2a) using the method for peripheral milling, to quartz
Surrounding layer (2a) is polished.
7. the manufacture method of the double-cladding active optical fiber as described in any one of claim 1 to 6, it is characterised in that：In step S5
The output beam quality of the double-cladding active optical fiber (6) is less than 1.2, and fundamental mode loss is less than 0.5dB/m, and high-order mode loss is more than
100dB/m。
A kind of 8. double-cladding active optical fiber based on manufacture method described in claim 1, it is characterised in that：The double-cladding active
Optical fiber (6) includes silica core (1a), silica clad (1b), low refractive index coating (5) and the optical fiber set gradually from the inside to the outside
Outer overlay (4)；The silica clad (1b) is D-shaped or regular polygon；The refractive index of the low refractive index coating (5) is less than
Silica clad (1b), low refractive index coating (5) are 1.33~1.38 in 633nm refractive index；
Disc waveguide fibre core (2b) is provided with the silica clad (1b), disc waveguide fibre core (2b) spiral surrounding is in quartzy fine
Around core (1a), 0.5~120 spiral is surrounded with every meter of silica core (1a).
9. double-cladding active optical fiber as claimed in claim 8, it is characterised in that：The output of the double-cladding active optical fiber (6)
Beam quality is less than 1.2, and fundamental mode loss is less than 0.5dB/m, and high-order mode loss is more than 100dB/m.
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| CN106990475A (en) * | 2017-05-18 | 2017-07-28 | 烽火通信科技股份有限公司 | New wavelength Double Cladding Ytterbium Doped Fiber and preparation method |
| CN109752830B (en) * | 2018-12-12 | 2021-06-08 | 桂林电子科技大学 | All-fiber STED super-resolution microscopic lighting device |
| CN112851127B (en) * | 2021-01-16 | 2021-11-02 | 威海长和光导科技有限公司 | High-gain Ho3+/Tm3+/Yb3+Co-doped quartz optical fiber and preparation method thereof |
| CN113466989B (en) * | 2021-07-06 | 2023-02-28 | 中天科技精密材料有限公司 | Chiral coupling fiber core optical fiber and preparation method thereof |
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