CN205982710U - Double -contracting layer active optical fibre - Google Patents
Double -contracting layer active optical fibre Download PDFInfo
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- CN205982710U CN205982710U CN201620692420.5U CN201620692420U CN205982710U CN 205982710 U CN205982710 U CN 205982710U CN 201620692420 U CN201620692420 U CN 201620692420U CN 205982710 U CN205982710 U CN 205982710U
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Abstract
The utility model discloses the problem that will solve provides a double -contracting layer active optical fibre, the quartzy fibre core, inner cladding, surrounding layer and the coat that set gradually including from interior to exterior, the refracting index of quartzy fibre core is greater than the refracting index of inner cladding, the refracting index of inner cladding is greater than the refracting index of surrounding layer, its characterized in that, the cross section of inner cladding is eight sections straight lines and eight sections central symmetry figures that the circular arc is constituteed, the straight line with circular arc adjacent connection respectively, eight sections straight line extension two double -phase friendships of back constitute a regular octagon. The utility model provides a double -contracting layer active optical fibre guarantees in the commercial optic fibre waveguide structure of compatibility that two cladded fiber have higher pumping absorptance to the yield of optic fibre can be improved, prefabricated excellent cost of manufacture is reduced.
Description
Technical field
The utility model belongs to optical fiber laser and its components and parts field, is related to a kind of double-cladding active optical fiber.
Background technology
Active Optical Fiber is that one kind mixes some specific rare earth ions such that it is able to absorb short wavelength's pump light simultaneously in fibre core
Send the optical fiber of long wavelength laser.Before doubly clad optical fiber technology occurs, people adopt single-mode fiber doping with rare-earth ions
Mode prepare Active Optical Fiber.Because generally 8 μm to 10 μm of the core diameter of single-mode fiber it is desirable to incite somebody to action big from the end face of optical fiber
It is not an easy thing that the coupling pump light of power enters optical fiber, and due to the restriction of pump power, single mode doped fiber swashs
The power output of light device can not break through all the time.With the appearance of doubly clad optical fiber structure, this problem is readily solved.Doubly clad optical fiber
Operation principle be：Pump light by optical system coupled entrance inner cladding, pump light in inner cladding roundtrip to forward pass
Defeated, constantly through middle doped core, the rare earth ion absorptive pumping light in fibre core so that fibre core forms population inversion,
Produce laser, and transmit in fibre core.Compared with single-mode fiber, doubly clad optical fiber improves than single-mode fiber in absorption efficiency
Hundreds of times.
The structure design of doubly clad optical fiber substantially improves the power output of optical fiber laser, but inner cladding and fibre core are all
It is the absorption efficiency still only 10% of the doubly clad optical fiber of circle symmetrical structure, there is substantial amounts of spiral light and do not pass through fibre all the time
Core, situation about not absorbed by fibre core.Therefore people carried out in the shape of inner cladding and the position of fibre core improve it is proposed that
Multiple inner cladding structures of different shapes, such as D type, blossom type, rectangle, hexagon, octagon etc., fibre core position is slightly eccentric
Also absorption efficiency can be improved.And the cross section of the inner cladding of main flow import double-cladding active optical fiber Nufern optical fiber domestic at present
For octagon.
However, octagon inner cladding optical fiber there is also some drawbacks, such as cylinder prefabricated rods are being polished into cross section
For octagon prism when, the side of prism is due to more sharp and lead to easily to split frangible, and prefabricated rods are in the process being polished
In, after polishing, discarded quartz material reaches overall 10%.
Therefore, for of the prior art not enough it is necessary to provide a kind of active double clad fiber to improve existing skill
Art problem.
Utility model content
Problem to be solved in the utility model is the problem overcoming prior art to exist, and provides a kind of double-cladding active light
Fibre, effectively solving prefabricated rods easily split frangible problem when polishing, and can reduce the cost of manufacture of prefabricated rods simultaneously.
For solving above-mentioned technical problem, technical solution of the present utility model is realized in：A kind of double clad has
Source optical fiber, including the silica core 1 setting gradually from the inside to the outside, inner cladding 2, surrounding layer 3 and coat 4, described silica core 1
Refractive index be more than the refractive index of described inner cladding 2, the refractive index of described inner cladding 2 is more than the refractive index of described surrounding layer 3, its
It is characterised by, the cross section of described inner cladding 2 is eight sections of straight lines 20 and the centrosymmetric image of eight sections of circular arc 21 compositions, described straight
Line 20 and described circular arc 21 adjacent connection respectively, described eight sections of straight lines 20 intersect one octagon of composition after extending two-by-two.
Further, the octagon that the radius of circle that described eight sections of circular arcs 21 are formed is crossed to form with described straight line 20
The radius ratio of inscribed circle is 1.035～1.070.
The utility model can bring following beneficial effect：
When double-cladding active optical fiber prefabricated rods are ground, reduce diameter, and retain the original rib of prefabricated rods
Circular arc at angle, is in line without circular arc is deliberately polished, and so can reduce the materials of prefabricated rods, reduce and grind loss, with
When can also reduce time of grinding, in addition, the reservation of circular arc also reduces prefabricated rods in sharp corner cracking, damaged probability,
Improve the yield rate of optical fiber.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of specification, and in order to allow above and other purpose of the present utility model, feature
Can become apparent with advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, describe in detail as follows.
Brief description
Fig. 1 is the structural representation of the utility model preferred embodiment；
Fig. 2 is the structural representation that the utility model preferred embodiment inner cladding cross-sectional straight line elongated segment forms octagon
Figure；
Fig. 3 is positive eight that the circle that the utility model preferred embodiment inner cladding cross-sectional arc section is formed is formed with straightway
The structural representation of side shape inscribed circle；
Fig. 4 is double-cladding active optical fiber pump absorption coefficient test chart in the utility model embodiment.
In figure：
1：Silica core 2：Inner cladding 3：Surrounding layer 4：Coat
20：Straight line 21：Circular arc
Specific embodiment
Technological means, creation characteristic, reached purpose and effect for the utility model realization is expanded on further are readily apparent from
Understand, below in conjunction with accompanying drawing and preferred embodiment, to according to the utility model double-cladding active optical fiber specific embodiment, knot
Structure, feature and its effect, describe in detail as follows.
A kind of double-cladding active optical fiber described in the utility model, including the silica core 1 setting gradually from the inside to the outside, interior
Covering 2, surrounding layer 3 and coat 4, the refractive index of silica core 1 is more than the refractive index of inner cladding 2, and the refractive index of inner cladding 2 is big
In the refractive index of surrounding layer 3, wherein, the cross section of inner cladding 2 is a figure being made up of eight sections of straight lines 20 and eight sections of circular arcs 21
The adjacent connection respectively of shape, straight line 20 and circular arc 21, as shown in Fig. 2 eight sections of straight lines 20 intersect after extending two-by-two constitutes one positive eight
Side shape, the cross section of inner cladding is a centrosymmetric image.As shown in figure 3, the radius of circle and eight that eight sections of circular arcs 21 are constituted
The radius ratio of the inscribed circle of octagon that section straight line 20 is crossed to form is 1.035～1.070.
The concrete preparation method of double-cladding active optical fiber comprises the steps：
(1) the sandwich layer diameter d of clear and definite double-cladding active optical fiber prefabricated rods female rod and core bag, than α, calculate D1=d* α,
Wherein D1It is the spacing of straight line opposite side after prefabricated rods are ground；
(2) radius ratio β of the inscribed circle of octagon that the radius of circle that circular arc is constituted is formed with straight line intersection is 1.035
～1.070, calculate D2=D1* β, wherein D2External diameter for straight flange to be ground after prefabricated rods female rod sleeve pipe；
(3) preform female rod sleeve pipe to external diameter is D2；
(4) it is D to external diameter2Prefabricated rods be ground, until four pairs of straight line opposite side spacing of inner cladding cross-sectional are
D1；
(5) prefabricated rods after grinding being carried out drawing optical fibers is double-cladding active optical fiber.
Embodiment one
The concrete preparation method of double-cladding active optical fiber comprises the steps：
(1) the sandwich layer diameter d=2mm of clear and definite double-cladding active optical fiber prefabricated rods female rod and core bag are than α=1:20, calculate
Draw D1=2*20=40mm, wherein D1It is the spacing of straight line opposite side after prefabricated rods are ground；
(2) radius ratio β of the inscribed circle of octagon that the radius of circle that circular arc is constituted is formed with straight line intersection is
1.035, calculate D2=40*1.035=41.4mm, wherein D2External diameter for straight flange to be ground after prefabricated rods female rod sleeve pipe；
(3) preform female rod sleeve pipe to external diameter is 41.4mm；
(4) to external diameter, the prefabricated rods for 41.4mm are ground, until four pairs of straight line opposite side spacing of inner cladding cross-sectional
It is 40mm；
(5) prefabricated rods after grinding being carried out drawing optical fibers is 20 μm of core diameter, inner cladding diameter (straight flange opposite side distance)
400 μm of double-cladding active optical fiber, the cladding pumping absorption coefficient recording its 915nm and 975nm is shown in Fig. 2.
Embodiment two
The concrete preparation method of double-cladding active optical fiber comprises the steps：
(1) the sandwich layer diameter d=2mm of clear and definite double-cladding active optical fiber prefabricated rods female rod and core bag are than α=1:20, calculate
Draw D1=2*20=40mm, wherein D1It is the spacing of straight line opposite side after prefabricated rods are ground；
(2) radius ratio β of the inscribed circle of octagon that the radius of circle that circular arc is constituted is formed with straight line intersection is
1.035, calculate D2=40*1.050=42mm, wherein D2External diameter for straight flange to be ground after prefabricated rods female rod sleeve pipe；
(3) preform female rod sleeve pipe to external diameter is 42mm；
(4) to external diameter, the prefabricated rods for 42mm are ground, until four pairs of straight line opposite side spacing of inner cladding cross-sectional are equal
For 40mm；
(5) prefabricated rods after grinding being carried out drawing optical fibers is 20 μm of core diameter, inner cladding diameter (straight flange opposite side distance)
400 μm of double-cladding active optical fiber, the cladding pumping absorption coefficient recording its 915nm and 975nm is shown in Fig. 2.
Embodiment three
The concrete preparation method of double-cladding active optical fiber comprises the steps：
(1) the sandwich layer diameter d=2mm of clear and definite double-cladding active optical fiber prefabricated rods female rod and core bag are than α=1:20, calculate
Draw D1=2*20=40mm, wherein D1It is the spacing of straight line opposite side after prefabricated rods are ground；
(2) radius ratio β of the inscribed circle of octagon that the radius of circle that circular arc is constituted is formed with straight line intersection is
1.035, calculate D2=40*1.070=42.8mm, wherein D2External diameter for straight flange to be ground after prefabricated rods female rod sleeve pipe；
(3) preform female rod sleeve pipe to external diameter is 42.8mm；
(4) to external diameter, the prefabricated rods for 42.8mm are ground, until four pairs of straight line opposite side spacing of inner cladding cross-sectional
It is 40mm；
(5) prefabricated rods after grinding being carried out drawing optical fibers is 20 μm of core diameter, inner cladding diameter (straight flange opposite side distance)
400 μm of double-cladding active optical fiber, the cladding pumping absorption coefficient recording its 915nm and 975nm is shown in Fig. 2.
As shown in Fig. 2 the pump absorption coefficient of double-cladding active optical fiber is non-linear increasing.It is obtained by said method
Double-cladding active optical fiber can be used in optical fiber laser, realizes laser welding, laser cutting, laser boring, laser marking, laser
Engraving and laser weapon.
The above is only this and use new concrete application example, any limit is not constituted to protection domain of the present utility model
System.All employing equivalents or equivalence replacement and the technical scheme that formed, all fall within the utility model rights protection scope it
Interior.
Claims (2)
1. a kind of double-cladding active optical fiber, including the silica core (1) setting gradually from the inside to the outside, inner cladding (2), surrounding layer
(3) with coat (4), the refractive index of described silica core (1) is more than the refractive index of described inner cladding (2), described inner cladding (2)
Refractive index be more than described surrounding layer (3) refractive index it is characterised in that described inner cladding (2) cross section be eight sections of straight lines
(20) the adjacent connection respectively of the centrosymmetric image that and eight sections of circular arcs (21) form, described straight line (20) and described circular arc (21),
Described eight sections of straight lines (20) intersect one octagon of composition after extending two-by-two.
2. a kind of double-cladding active optical fiber according to claim 1 is it is characterised in that what described eight sections of circular arcs (21) were formed
The radius ratio of the inscribed circle of octagon that the radius of circle and described straight line (20) are crossed to form is 1.035～1.070.
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| CN201620692420.5U CN205982710U (en) | 2016-07-04 | 2016-07-04 | Double -contracting layer active optical fibre |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018068609A1 (en) * | 2016-10-12 | 2018-04-19 | 长飞光纤光缆股份有限公司 | Double-clad fibre doped with rare earth and preparation method therefor |
| CN108761631A (en) * | 2018-05-03 | 2018-11-06 | 烽火通信科技股份有限公司 | A kind of Yb dosed optical fiber and its manufacturing method |
| CN108828711A (en) * | 2018-05-03 | 2018-11-16 | 烽火通信科技股份有限公司 | A kind of Yb dosed optical fiber |
| CN110190496A (en) * | 2019-06-27 | 2019-08-30 | 深圳市创鑫激光股份有限公司 | A kind of triple clad Active Optical Fiber, light amplification structure and optical fiber laser |
| CN111983748A (en) * | 2020-08-20 | 2020-11-24 | 烽火通信科技股份有限公司 | Energy homogenization optical fiber and preparation method thereof |
| CN112114397A (en) * | 2020-08-28 | 2020-12-22 | 武汉光谷航天三江激光产业技术研究院有限公司 | Super-large mode field low-numerical aperture metal coating gain optical fiber and manufacturing method thereof |
-
2016
- 2016-07-04 CN CN201620692420.5U patent/CN205982710U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018068609A1 (en) * | 2016-10-12 | 2018-04-19 | 长飞光纤光缆股份有限公司 | Double-clad fibre doped with rare earth and preparation method therefor |
| US10838143B2 (en) | 2016-10-12 | 2020-11-17 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Rare earth-doped double-clad optical fiber and preparation method thereof |
| CN108761631A (en) * | 2018-05-03 | 2018-11-06 | 烽火通信科技股份有限公司 | A kind of Yb dosed optical fiber and its manufacturing method |
| CN108828711A (en) * | 2018-05-03 | 2018-11-16 | 烽火通信科技股份有限公司 | A kind of Yb dosed optical fiber |
| CN110190496A (en) * | 2019-06-27 | 2019-08-30 | 深圳市创鑫激光股份有限公司 | A kind of triple clad Active Optical Fiber, light amplification structure and optical fiber laser |
| CN111983748A (en) * | 2020-08-20 | 2020-11-24 | 烽火通信科技股份有限公司 | Energy homogenization optical fiber and preparation method thereof |
| CN112114397A (en) * | 2020-08-28 | 2020-12-22 | 武汉光谷航天三江激光产业技术研究院有限公司 | Super-large mode field low-numerical aperture metal coating gain optical fiber and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201010 Address after: 200437 Shanghai city Yangpu District Yixian Road No. 135 Patentee after: SHANGHAI INSTITUTE OF TRANSMISSION LINE (CETC NO.23 INSTITUTE) Address before: 200434 Shanghai city Yangpu District Yixian Road No. 135 Patentee before: TXSTAR LASER TECHNOLOGY (SHANGHAI) Co.,Ltd. |
|
| TR01 | Transfer of patent right |