CN103135169B - Optical fiber - Google Patents
Optical fiber Download PDFInfo
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- CN103135169B CN103135169B CN201310095080.9A CN201310095080A CN103135169B CN 103135169 B CN103135169 B CN 103135169B CN 201310095080 A CN201310095080 A CN 201310095080A CN 103135169 B CN103135169 B CN 103135169B
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- optical fiber
- core
- fiber core
- fiber
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 39
- 239000000835 fiber Substances 0.000 claims abstract description 67
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 238000010168 coupling process Methods 0.000 abstract description 10
- 230000008878 coupling Effects 0.000 abstract description 9
- 238000005859 coupling reaction Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention relates to the technical field of waveguide media, in particular to an optical fiber. The optical fiber comprises a first optical fiber main body and a second optical fiber main body, the first optical fiber main body comprises a first wrapping layer and a first round fiber core, the first wrapping layer is wrapped on the outer surface of the first round fiber core, the second optical fiber main body comprises a second wrapping layer, a second round fiber core and a third fiber core, the second round fiber core is wrapped on the outer surface of the third fiber core, the second wrapping layer is wrapped on the outer surface of the second round fiber core, and a reflection rate of the third fiber core is larger than that of the second round fiber core. According to the optical fiber, an optical fiber with a relatively small transmission angle carries out total reflection in a new reflection rate critical plane, a part of light is bound in a fiber core with a higher reflection rate, and therefore, in the original fiber core, a layer of new waveguide is added, energy concentration ratio can be increased, beam quality is further improved, and optical fiber transmission distance and coupling efficiency are increased.
Description
Technical field
The present invention relates to technical field of waveguide media, particularly relate to a kind of optical fiber that can improve optical fiber energy concentration inside.
Background technology
Common optical fiber is made up of fibre core and covering two parts.Luminous energy is strapped in fiber core by covering, luminous energy and then transmit in fibre core.Under applicable cases such as transmission laser beam energy etc., the encircled energy of practical laser light beam in fiber core (can degree of focus) is the important evidence of objective measure beam quality.In Optical Fiber Transmission coupling process, encircled energy can affect transmission coupling efficiency, can produce very serious impact to practical application.Therefore, improve encircled energy, significant to increase Optical Fiber Transmission distance, increase beam quality and coupling efficiency.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: how to provide a kind of structure simple and the optical fiber that encircled energy is higher.
(2) technical scheme
For solving the problem, the invention provides a kind of optical fiber and comprise the first fiber body and the second fiber body, described first fiber body comprises the first covering and the first circular core; Described first covering is wrapped in the outside surface of described first circular core;
Described second fiber body comprises the second covering, the second circular core and the 3rd fibre core; Described second circular core is wrapped in the outside surface of described 3rd fibre core; Described second covering is wrapped in the outside surface of described second circular core; The refractive index of described 3rd fibre core is greater than the refractive index of the second circular core.
Further, the diameter of described first circular core is identical with the diameter of the second circular core.
Further, the thickness of described first covering is identical with the thickness of the second covering.
Further, the section of described 3rd fibre core is circular, square or oval.
(3) beneficial effect
Optical fiber provided by the invention, by arranging refractive index more much higher core fibre core unit and fibril core forms the new waveguide of one deck, the less light beam in section dissipates angle being tied up in new waveguide, encircled energy can be increased, and then improve beam quality, increase Optical Fiber Transmission distance and coupling efficiency.
Accompanying drawing explanation
Fig. 1 (a) is longitudinal schematic diagram of the present invention first fiber body;
Fig. 1 (b) is the diagrammatic cross-section of the present invention first fiber body;
Fig. 1 (c) is the refractive index profile distribution plan of the present invention first fiber body;
Fig. 2 (a) is longitudinal schematic diagram of the present invention second light main body;
Fig. 2 (b) is the diagrammatic cross-section of the present invention first fiber body;
Fig. 2 (c) is the present invention first fiber body refractive index profile distribution plan;
Fig. 3 is longitudinal schematic diagram of optical fiber general structure of the present invention;
Fig. 4 (a) and 4(b) be respectively in the embodiment of the present invention one energy profile after the energy profile after the ordinary optic fibre of the equidimension that is coupled and coupling the present invention;
Fig. 5 (a) and 5(b) be respectively in the embodiment of the present invention two energy profile after the energy profile after the ordinary optic fibre of the equidimension that is coupled and coupling the present invention;
Fig. 6 (a) and 6(b) be respectively in the embodiment of the present invention three energy profile after the energy profile after the ordinary optic fibre of the equidimension that is coupled and coupling the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 3, the optical fiber that the embodiment of the present invention provides comprises: the first fiber body and the second fiber body.
Concrete, with reference to figure 1(a) to Fig. 1 (c), the first fiber body in the present embodiment comprises the first covering 101 and the first circular core 102; First covering 101 is wrapped in the outside surface of described first circular core 102.
With reference to figure 2(a) to Fig. 2 (c), the second fiber body in the present embodiment comprises the second covering 201, second circular core 202 and the 3rd fibre core 203; Described second circular core 202 is wrapped in the outside surface of described 3rd fibre core 203; Described second covering 201 is wrapped in the outside surface of described second circular core 202; The refractive index of described 3rd fibre core 203 is greater than the refractive index of the second circular core 202.
Wherein, the diameter arranging the first circular core 102 is identical with the diameter of the second circular core 202, and the thickness of the first covering 101 is identical with the thickness of the second covering 201.
Wherein, the refractive index of the first circular core 102, compared with the refractive index of the second circular core 202, can be the same or different, specifically can determine according to the actual requirements.The refractive index of the first covering 101, compared with the refractive index of the second covering 201, can be the same or different, specifically can determine according to the actual requirements.
Wherein, the section of the 3rd fibre core 203 can be circular, also can be shape as square, oval etc. non-circular.
Light is after optical fiber provided by the invention, refractive index more much higher core fibre core unit and fibril core form the new waveguide of one deck, the less light beam in section dissipates angle is tied up in new waveguide, encircled energy can be increased, and then improve beam quality, increase Optical Fiber Transmission distance and coupling efficiency.
Light is after optical fiber provided by the invention, and encircled energy can increase, and with more specifically embodiment, the present invention will be described below:
Embodiment one
Wavelength enters optical fiber in the optically-coupled of 1064nm, and the length of the first fiber body of optical fiber is 0.5m, and numerical aperture is NA=0.22; The length of the second fiber body is 0.5m, numerical aperture NA=0.22 between second covering 201 and the second circular core 202, numerical aperture NA=0.1 between 3rd circular core and the 3rd fibre core 203, wherein, the diameter of the second circular core 202 is 200um, 3rd fibre core 203 is circular core, and when the diameter of the 3rd circular core is 100um, encircled energy is increased to 33.408% by original 22.034%.With reference to figure 4(a) and 4(b).
Embodiment two
Wavelength enters optical fiber in the optically-coupled of 1064nm, and the length of the first fiber body of optical fiber is 0.5m, and numerical aperture is NA=0.22; The length of the second fiber body is 0.5m, numerical aperture NA=0.22 between second covering 201 and the second circular core 202, wherein, the 3rd fibre core is square fibre core, the numerical aperture NA=0.1 between this square fibre core and the second circular core 202, the diameter of the second circular core 202 is 200um, square fibre core is square, and the length of side is 70um, symmetrical centered by square fibre core, when axis of symmetry overlaps with Z axis, encircled energy is increased to 30.609% by original 22.387%.With reference to figure 5(a) and 5(b).
Embodiment three
Wavelength enters optical fiber in the optically-coupled of 1064nm, and the length of the first fiber body of optical fiber is 0.5m, and numerical aperture is NA=0.22; The length of the second fiber body is 0.5m, numerical aperture NA=0.22 between second covering 201 and the second circular core 202, wherein, 3rd fibre core is elliptical core, numerical aperture NA=0.1 between this elliptical core and the second circular core 202, the diameter of the second circular core is 200um, and this elliptical core major radiuses is 50um, when secondary radius is 30um, encircled energy is increased to 30.185% by original 22.915%.With reference to figure 6(a) and 6(b).
The optical fiber tool that above-described embodiment provides has the following advantages: optical fiber provided by the invention, the relatively little optical fiber of transmission of angle is totally reflected at new refractive index critical surface, segment beam is made to tie up in the fibre core that refractive index is higher, like this in original fibre core, turn increase the waveguide that one deck is new, encircled energy can be increased, and then improve beam quality, increase Optical Fiber Transmission distance and coupling efficiency.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and replacement, these improve and replace and also should be considered as protection scope of the present invention.
Claims (3)
1. an optical fiber, is characterized in that, described optical fiber comprises the first fiber body and the second fiber body, and described first fiber body and the second fiber body are point-blank docked, and described first fiber body comprises the first covering and the first circular core; Described first covering is wrapped in the outside surface of described first circular core;
Described second fiber body comprises the second covering, the second circular core and the 3rd fibre core; Described second circular core is wrapped in the outside surface of described 3rd fibre core; Described second covering is wrapped in the outside surface of described second circular core; The refractive index of described 3rd fibre core is greater than the refractive index of the second circular core;
Described first circular core is identical respectively with refractive index with the diameter of the second circular core.
2. optical fiber according to claim 1, is characterized in that, the thickness of described first covering is identical with the thickness of the second covering.
3. optical fiber according to claim 1, is characterized in that, the section of described 3rd fibre core is circular, square or oval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310095080.9A CN103135169B (en) | 2013-03-22 | 2013-03-22 | Optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310095080.9A CN103135169B (en) | 2013-03-22 | 2013-03-22 | Optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103135169A CN103135169A (en) | 2013-06-05 |
| CN103135169B true CN103135169B (en) | 2015-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310095080.9A Expired - Fee Related CN103135169B (en) | 2013-03-22 | 2013-03-22 | Optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103135169B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101622560A (en) * | 2007-03-05 | 2010-01-06 | 株式会社藤仓 | Photonic band gap fiber |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9347271B2 (en) * | 2008-10-17 | 2016-05-24 | Foro Energy, Inc. | Optical fiber cable for transmission of high power laser energy over great distances |
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2013
- 2013-03-22 CN CN201310095080.9A patent/CN103135169B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101622560A (en) * | 2007-03-05 | 2010-01-06 | 株式会社藤仓 | Photonic band gap fiber |
Non-Patent Citations (1)
| Title |
|---|
| 低损耗低非线性高负色散光子晶体光纤的优化设计;张亚妮;《物理学报》;20120831;第61卷(第8期);全文 * |
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| CN103135169A (en) | 2013-06-05 |
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Granted publication date: 20150218 |