CN108254828A - A kind of doubly clad optical fiber - Google Patents
A kind of doubly clad optical fiber Download PDFInfo
- Publication number
- CN108254828A CN108254828A CN201611243985.6A CN201611243985A CN108254828A CN 108254828 A CN108254828 A CN 108254828A CN 201611243985 A CN201611243985 A CN 201611243985A CN 108254828 A CN108254828 A CN 108254828A
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- CN
- China
- Prior art keywords
- refractive index
- optical fiber
- inner cladding
- surrounding layer
- doubly clad
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0283—Graded index region external to the central core segment, e.g. sloping layer or triangular or trapezoidal layer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of doubly clad optical fibers, include fibre core successively from inside to outside, inner cladding, surrounding layer and protective layer, the inner cladding and the refractive index of surrounding layer is continuously decreased by fibre core to protective layer direction, the refractive index of the fibre core is more than the largest refractive index of inner cladding, the refractive index of the inner cladding is more than the largest refractive index of surrounding layer, by the form that the inner cladding of optical fiber and surrounding layer are arranged to gradually changed refractive index, and the refractive index of inner cladding inner peripheral surface to surrounding layer peripheral surface is successively decreased relationship in function gradual change, spiral luminous effect can be fully avoided with this solution, substantially increase pumping efficiency.
Description
Technical field
The present invention relates to field fiber, especially a kind of doubly clad optical fiber.
Background technology
The optical fiber of current many concentric circles coverings is mostly using circular symmetric structure, and the refractive index of fibre cladding is consolidated
It is fixed, after being input to optical fiber due to pump light, " spiral light " effect can be generated by a part of pump light of clad refractive, leads to this
Part pump light can not always be input to fibre core and carry out signal transmission, so that the signal transmission of pump light is depleted,
Pumping efficiency is reduced, in order to solve these problems, people have devised the optical fiber of a variety of cladding structures, to avoid " spiral light "
Generation, the optical fiber of asymmetric cladding structure known today has D types, racetrack, blossom type, corner cut rectangle, regular polygon etc.
Deng, although these special-shaped optical fibres are significantly improved in pump absorption, the easily continuous loss of generation pumping, and certain
The toughness of optical fiber is reduced in degree and there is the problem of manufacture is difficult so that the reliability of these optical fiber substantially reduces.
Invention content
It, being capable of transmitting optical signal, knot the purpose of the present invention is to provide one kind in order to solve the deficiencies in the prior art
Structure is stable, can effectively reduce the doubly clad optical fiber of spiral luminous effect.
In order to realize above-mentioned technical purpose, the technical scheme is that：A kind of doubly clad optical fiber, from inside to outside successively
Including fibre core, inner cladding, surrounding layer and protective layer, the refractive index of the inner cladding and surrounding layer is by fibre core to protective layer direction
It continuously decreases, the refractive index of the fibre core is more than the largest refractive index of inner cladding, and the refractive index of the inner cladding is more than surrounding layer
Largest refractive index.
Further, the refractive index of the inner cladding inner peripheral surface to surrounding layer peripheral surface is successively decreased relationship in gradual change.
Further, the inner cladding, surrounding layer are ion-doped optical fiber covering.
Further, the doubly clad optical fiber is D types doubly clad optical fiber or concentric circles doubly clad optical fiber.
Above-mentioned technical solution is employed, beneficial effects of the present invention are：By by the inner cladding of optical fiber and surrounding layer all
It is arranged to the form of gradually changed refractive index, and the refractive index of inner cladding inner peripheral surface to surrounding layer peripheral surface is successively decreased pass in function gradual change
System, can fully avoid spiral luminous effect, substantially increase pumping efficiency with this solution.
Description of the drawings
The present invention is further elaborated with reference to the accompanying drawings and detailed description：
The schematic cross-section that Fig. 1 is product of the present invention when being concentric circles doubly clad optical fiber；
Fig. 2 is the schematic diagram that product of the present invention is D type doubly clad optical fibers；
Refractive index profiles of the Fig. 3 for ordinary optic fibre in the prior art, wherein n1Represent refractive index, the n of fibre core2Represent inner cladding
Refractive index, n3Represent the refractive index of surrounding layer；
Refractive index profiles of the Fig. 4 for product of the present invention, wherein n1Represent refractive index, the n of fibre core2Represent the refraction of inner cladding
Rate, n3Represent the refractive index of surrounding layer.
Specific embodiment
As shown in Fig. 1 to one of 2, product of the present invention includes fibre core 1, inner cladding 2, surrounding layer 3 and protects successively from inside to outside
The refractive index of sheath 4, the inner cladding 2 and surrounding layer 3 is continuously decreased by fibre core 1 to 4 direction of protective layer, the fibre core 1
Refractive index is more than the largest refractive index of inner cladding 2, and the refractive index of the inner cladding 2 is more than the largest refractive index of surrounding layer 3.
In order to improve the efficiency of pump light input fibre core 1, the refraction of 2 inner peripheral surface of inner cladding to 3 peripheral surface of surrounding layer
Rate is successively decreased in functional relation and gradual change, it is preferred that inner cladding 2, surrounding layer 3 can be prepared into ion by ion doping technique
Doped fiber covering, by change ion doping concentration come the refractive index of inner cladding 2 and surrounding layer 3 in functional relation and from
Fibre core 1 gradually successively decreases toward 4 direction of protective layer, while D types doubly clad optical fiber or concentric circles double clad may be used in doubly clad optical fiber
Optical fiber, wherein D-type optical fiber inherently have certain anti-spiral luminous effect, using D types doubly clad optical fiber by its inner cladding 2 and outside
Covering 3 all enables its refractive index to greatly reduce the generation of spiral light in function relationship of successively decreasing using ion doping, improves
The efficiency of transmission of pump light.
Detect respectively the fibre core 1 of product of the present invention, inner cladding 2, surrounding layer 3 refractive index and with existing doubly clad optical fiber
It is compared, can obtain refractive index profile as shown in Figure 3 and Figure 4, as seen from the figure, product of the present invention is by inner cladding 2 and outside
Covering 3 is arranged to the form of gradually changed refractive index, and pump light, can be because of the refractive index of inner cladding 2 and surrounding layer 3 when being transmitted
It is different and be gradually directed to fibre core 1 so that the efficiency of pump light improves.
The above is the embodiment of the present invention, for the ordinary skill in the art, religion according to the present invention
Lead, without departing from the principles and spirit of the present invention all equivalent changes done according to scope of the present invention patent, repair
Change, replace and modification, should all belong to the covering scope of the present invention.
Claims (4)
1. a kind of doubly clad optical fiber includes fibre core, inner cladding, surrounding layer and protective layer successively from inside to outside, it is characterised in that：Institute
The inner cladding and the refractive index of surrounding layer stated are continuously decreased by fibre core to protective layer direction, and the refractive index of the fibre core is more than interior packet
The largest refractive index of layer, the refractive index of the inner cladding are more than the largest refractive index of surrounding layer.
2. a kind of doubly clad optical fiber according to claim 1, it is characterised in that：Outside the inner cladding inner peripheral surface to surrounding layer
The refractive index of circumferential surface is successively decreased relationship in gradual change.
3. a kind of doubly clad optical fiber according to claim 1, it is characterised in that：The inner cladding, surrounding layer be from
Sub- doped fiber covering.
4. a kind of doubly clad optical fiber according to claim 1, it is characterised in that：The doubly clad optical fiber is D type double-contractings
Layer optical fiber or concentric circles doubly clad optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611243985.6A CN108254828A (en) | 2016-12-29 | 2016-12-29 | A kind of doubly clad optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611243985.6A CN108254828A (en) | 2016-12-29 | 2016-12-29 | A kind of doubly clad optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108254828A true CN108254828A (en) | 2018-07-06 |
Family
ID=62718989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611243985.6A Withdrawn CN108254828A (en) | 2016-12-29 | 2016-12-29 | A kind of doubly clad optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108254828A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491213A (en) * | 2018-12-04 | 2019-03-19 | 芯恩（青岛）集成电路有限公司 | A kind of total reflection integrator increasing exposure intensity |
| CN109695025A (en) * | 2019-02-01 | 2019-04-30 | 吉林大学 | A kind of covering and preparation method thereof that refractive index is radially successively decreased along sapphire fiber |
| CN113376731A (en) * | 2021-05-17 | 2021-09-10 | 北京邮电大学 | Few-mode dual-core optical power beam splitter unit and integrated optical power beam splitter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6516125B1 (en) * | 1998-12-17 | 2003-02-04 | Lg Cable Ltd. | Dispersion shifted optical fiber having triple clad |
| CN1564033A (en) * | 2004-03-29 | 2005-01-12 | 烽火通信科技股份有限公司 | Double cladding rare-earth doped optical fiber and its mfg. method |
| CN101373239A (en) * | 2008-10-07 | 2009-02-25 | 华南理工大学 | High gain double-cladding two-dimensional array optical fiber and preparation method thereof |
| CN102116897A (en) * | 2011-03-04 | 2011-07-06 | 北京交通大学 | Cladded pumping optical fiber capable of efficiently adsorbing pumping light |
-
2016
- 2016-12-29 CN CN201611243985.6A patent/CN108254828A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6516125B1 (en) * | 1998-12-17 | 2003-02-04 | Lg Cable Ltd. | Dispersion shifted optical fiber having triple clad |
| CN1564033A (en) * | 2004-03-29 | 2005-01-12 | 烽火通信科技股份有限公司 | Double cladding rare-earth doped optical fiber and its mfg. method |
| CN101373239A (en) * | 2008-10-07 | 2009-02-25 | 华南理工大学 | High gain double-cladding two-dimensional array optical fiber and preparation method thereof |
| CN102116897A (en) * | 2011-03-04 | 2011-07-06 | 北京交通大学 | Cladded pumping optical fiber capable of efficiently adsorbing pumping light |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491213A (en) * | 2018-12-04 | 2019-03-19 | 芯恩（青岛）集成电路有限公司 | A kind of total reflection integrator increasing exposure intensity |
| CN109695025A (en) * | 2019-02-01 | 2019-04-30 | 吉林大学 | A kind of covering and preparation method thereof that refractive index is radially successively decreased along sapphire fiber |
| CN109695025B (en) * | 2019-02-01 | 2020-09-22 | 吉林大学 | Cladding with refractive index decreasing along radial direction of sapphire single crystal fiber and preparation method thereof |
| CN113376731A (en) * | 2021-05-17 | 2021-09-10 | 北京邮电大学 | Few-mode dual-core optical power beam splitter unit and integrated optical power beam splitter |
| CN113376731B (en) * | 2021-05-17 | 2022-09-13 | 北京邮电大学 | Few-mode dual-core optical power beam splitter unit and integrated optical power beam splitter |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180706 |
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| WW01 | Invention patent application withdrawn after publication |