CN201083847Y - Refractive index reverse guiding multi-core optical fiber - Google Patents
Refractive index reverse guiding multi-core optical fiber Download PDFInfo
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- CN201083847Y CN201083847Y CNU2007200746879U CN200720074687U CN201083847Y CN 201083847 Y CN201083847 Y CN 201083847Y CN U2007200746879 U CNU2007200746879 U CN U2007200746879U CN 200720074687 U CN200720074687 U CN 200720074687U CN 201083847 Y CN201083847 Y CN 201083847Y
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- refractive index
- cladding region
- guiding
- core
- optical fiber
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 45
- 239000000835 fiber Substances 0.000 claims abstract description 76
- 238000005253 cladding Methods 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000011343 solid material Substances 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000005368 silicate glass Substances 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 4
- 239000005365 phosphate glass Substances 0.000 claims description 4
- XHGGEBRKUWZHEK-UHFFFAOYSA-L tellurate Chemical compound [O-][Te]([O-])(=O)=O XHGGEBRKUWZHEK-UHFFFAOYSA-L 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 229910052691 Erbium Inorganic materials 0.000 claims description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 2
- 229910052779 Neodymium Inorganic materials 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052775 Thulium Inorganic materials 0.000 claims description 2
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052746 lanthanum Inorganic materials 0.000 claims description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 10
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- 230000008878 coupling Effects 0.000 description 4
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- 150000002500 ions Chemical class 0.000 description 1
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- UZLYXNNZYFBAQO-UHFFFAOYSA-N oxygen(2-);ytterbium(3+) Chemical compound [O-2].[O-2].[O-2].[Yb+3].[Yb+3] UZLYXNNZYFBAQO-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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Abstract
A refractive index back-guiding multi-core optical fiber comprises a plurality of cores and a cladding region, and is characterized in that the cladding region comprises an inner cladding region and an outer cladding region, wherein the inner cladding region is internally provided with the plurality of refractive index back-guiding cores and a plurality of sub-wavelength diameter cores positioned between the refractive index back-guiding cores in a linear mode; the refractive index back guide fiber core is composed of two parts of materials with the same axis of the middle low refractive index and the periphery high refractive index, and the refractive index of the inner cladding region is smaller than the refractive index of the refractive index back guide fiber core and the sub-wavelength diameter fiber core and larger than the refractive index of the outer cladding region; the inner cladding region and the outer cladding region are both made of solid materials with uniformly distributed refractive indexes. The utility model discloses can realize the phase locking of many fibre cores, can improve the bending property of this multicore optic fibre moreover, can use in fields such as high power fiber amplifier, laser instrument.
Description
Technical field
The utility model relates to optical fiber, especially a kind of refractive index inverse-guiding multi-core optical fiber to bend-insensitive.
Background technology
High-capacity optical fiber laser is with its remarkable performance and the price that overflows, gets increasingly extensive application in that Laser Processing, laser medicine, laser radar, laser ranging etc. are many-sided.Under same output power, the beam quality of fiber laser, reliability and volume size etc. all take advantage, in addition because the reduction of optical fiber cost and be easy to realize characteristics such as streamlined and production in enormous quantities, this not only causes the interest of scientists, and more attracts the very big concern of industrial community brainstrust.
Fiber laser proposes in the sixties in last century at first, but makes slow progress always, and until the development and the application of low loss fiber manufacturing technology and semiconductor laser, the side has brought new prospect for fiber laser.Fiber laser, is compared with block laser medium as laser medium with doped fiber, has following significant advantage: elongated being easy to of medium dispelled the heat; The waveguiding structure of optical fiber is easy to reach single transverse mode; Utilize the double clad technology to be easy to reach high-level efficiency and high power.In recent years, the research and development to based on the cladding pumping technology of doubly clad optical fiber make the output power of fiber laser break through kW, have broad application prospects in fields such as industry and communications.
The size and the output power of fiber core have much relations.The big more power that transmits of fibre core is just big more, and the power of the more little transmission of fibre core is crossed conference generation nonlinear effect, influences the optical fiber output power, even can cause damage to optical fiber.Therefore in doubly clad optical fiber, under the prerequisite that guarantees output beam quality, increase the fibre core of optical fiber as far as possible, but in general double clad rare earth doped fiber, the increase of fibre core can influence beam quality, cause the multimode output of fiber laser and amplifier, so the increase degree of fibre core is limited.
Microstructured optical fibers (Microstructured fiber, MF), be to be that the 2 D photon crystal of optical wavelength magnitude constitutes by grating constant, be the covering that the silica optical fiber array of regularly arranged airport constitutes optical fiber, the core of optical fiber is to have destroyed the periodic defective of cladding structure by one to constitute.Microstructured optical fibers has been compared numerous characteristics with traditional fiber, expands and increased the application of optical fiber effectively.
Another hoisting power is exactly a beam combination method and can keep the quality light beam method for quality simultaneously.Now, the coherent beam combination Study on Technology of high-capacity optical fiber laser has become one of international research focus, and countries such as the U.S., Germany and France encourage and support carrying out of this class research very much.The domestic and international research personnel have proposed multiple coherent beam combination technology at present, mainly contain: (MOPA) technology, multi-core fiber self-assembling technique, full optical fiber beam combination technology, spectrum beam combination technology and outer cavity coherent beam combination technology are amplified in main oscillations.Wherein the multi-core fiber self-assembling technique is a kind of simple relatively method, and this method produces coupling by the evanescent wave of adjacent fibre core transmitting beam, realizes phase-locked.But a little less than the evanescent wave coupling, people have proposed to utilize the leakage waves of refractive index inverse guiding structure to improve coupling.2002, people such as the breadboard Raymond J.Beach of U.S. Livermore have proposed the ribbon fiber design of refractive index inverse-guiding, utilize leakage waves to improve the coupling of many optical fiber, by adding fibre core, when this method can realize that the output power calibration is amplified, keep excellent beam quality [J.Opt.Soc.Am.B 19 (7) 1521-1534,2002].Human stacking methods such as nearest Feng.X. have prepared the refractive index inverse-guiding multi-core optical fiber of 16 cores, but this optical fiber is to bending very sensitive [Electronics Letters 40 (12) 10-11,2004].
Recently, can be low to moderate 50nm by the virgin favorable to the people fibre diameter that waits the people to adopt two step drawings to obtain of Zhejiang University, and keep lower fibre loss [Nature 426 816-819,2003].People such as the old perilous peak of Shanghai Communications University have summed up forefathers' experience and have proposed the bar shaped electric furnace and draw the awl method, adopt this new the drawing out diameter and can being low to moderate 650nm of awl method success of drawing, length can reach tens centimetres of magnitudes, the sub-wavelength diameter optical fiber [Opt.Express 14 (12) 5055-5060.2006s] of optical loss about 0.1dB/cm.This optical fiber has very strong evanscent field, and this characteristic can be widely used in a lot of fields.
Summary of the invention
The purpose of this utility model is to overcome the anti-guiding fiber of refractive index to crooked responsive deficiency, the refractive index inverse-guiding multi-core optical fiber that provides a kind of bending property to improve.This multi-core fiber can make many fibre cores effectively be coupled, and to bend-insensitive, can be applied in fields such as high power optical fibre laser beam combination.
Technical solution of the present utility model is as follows:
A kind of refractive index inverse-guiding multi-core optical fiber, comprise many fibre cores and clad region, be characterized in that described clad region comprises inner cladding region and outer cladding region, described inner cladding region neutral line arranging many refractive index inverse-guiding fibre cores and many sub-wavelength diameter fibre cores between this refractive index inverse-guiding fibre core; Described refractive index inverse-guiding fibre core is to be made of the low-refraction of centre and the peripheral coaxial two sections of material of high index of refraction, the refractive index of described inner cladding region is less than the refractive index of refractive index inverse-guiding fibre core and sub-wavelength diameter fibre core, and greater than the outer cladding region refractive index; Inner cladding region and outer cladding region constitute by the equally distributed solid material of refractive index.
The core diameter of described refractive index inverse-guiding fibre core is a micron order, and the core diameter of sub-wavelength diameter fibre core is in hundred nanometer scale, and the distance of sub-wavelength diameter fibre core and refractive index inverse-guiding fibre core is in wavelength magnitude.
Described refractive index inverse-guiding fibre core is closely arranged each other.
Described inner cladding region be shaped as rectangle or polygon.
Low-refraction in the described refractive index inverse-guiding fibre core partly is at least a of doped with rare-earth elements neodymium, erbium, ytterbium, thulium, lanthanum, go back adulterated al, phosphorus, at least a quartz glass of fluoride, silicate glass, phosphate glass simultaneously, or tellurate glass.
The host material of described sub-wavelength diameter fibre core, inner cladding region and outer cladding region is quartz glass, silicate glass, phosphate glass, or tellurate glass.
For guaranteeing that many fibre cores effectively are coupled, sub-wavelength diameter fibre core core diameter is in hundred nanometer scale, and the distance of sub-wavelength diameter fibre core and refractive index inverse-guiding fibre core is in wavelength magnitude.
Description of drawings
Fig. 1 is the optical fiber schematic cross-section of the utility model embodiment 1.
Fig. 2 is the optical fiber schematic cross-section of the utility model embodiment 3.
Fig. 3 is the optical fiber schematic cross-section of the utility model embodiment 4.
Embodiment
Below in conjunction with drawings and Examples the utility model is elaborated, but should not limit protection domain of the present utility model with this.
Embodiment 1:
See also Fig. 1, Fig. 1 is the optical fiber schematic cross-section of the utility model embodiment 1.This is that 5 refractive index inverse-guiding fibre core 2 linear array are arranged in the inner cladding region 6, and sub-wavelength diameter fibre core 5 covers the refractive index inverse-guiding multi-core optical fiber of outer cladding region 7 outside this inner cladding region 6 between refractive index inverse-guiding fibre core 2.Inner cladding region 6 is shaped as rectangle, and size is 60 μ m * 40 μ m, and outer cladding region 7 diameters are 125 μ m.High index of refraction part 3 is made up of shott SF16 silicate glass in the refractive index inverse-guiding fibre core 2, refractive index is 1.637, radius is 1.6 μ m, low-refraction part 4 is made up of shott F7 silicate glass, wherein is doped with the neodymia of 3.0wt%, and refractive index is 1.626, radius is 1 μ m, the material of sub-wavelength diameter fibre core 5 is identical with the material of high index of refraction part 3 in the refractive index inverse-guiding fibre core 2, and core diameter is 100nm, is 1 μ m apart from the distance of shaft axis of optic fibre.Inner cladding region 6 is made up of the shottF2 silicate glass, and refractive index is 1.612, and outer cladding region 7 materials are quartzy, and refractive index is 1.45.Experimental result shows: crooked very big to the influence of optical fiber 1 if do not introduce sub-wavelength diameter fibre core 5, after introducing sub-wavelength diameter fibre core 5, the bending property of optical fiber 1 under same crooked situation is greatly improved.
Embodiment 2:
Embodiment 3:
Fig. 2 is the optical fiber schematic cross-section of inventive embodiment 3, and embodiment 3 with the difference of embodiment 1 is: inner cladding region 6 is shaped as hexagon, and hexagonal side length is 60 μ m.
Embodiment 4:
Fig. 3 is the optical fiber schematic cross-section of inventive embodiment 4, and embodiment 4 with the difference of embodiment 1 is: include 8 refractive index inverse-guiding fibre cores 2 and 14 sub-wavelength diameter fibre cores 5 in the inner cladding region 6 of refractive index inverse-guiding multi-core optical fiber.
Claims (6)
1. refractive index inverse-guiding multi-core optical fiber, comprise many fibre cores and clad region, it is characterized in that described clad region comprises inner cladding region (6) and outer cladding region (7), described inner cladding region (6) neutral line arranging many refractive index inverse-guiding fibre cores (2) and be positioned at many sub-wavelength diameter fibre cores (5) between this refractive index inverse-guiding fibre core (2); Described refractive index inverse-guiding fibre core (2) is to be made of the low-refraction (4) of centre and the peripheral coaxial two sections of material of high index of refraction (3), the refractive index of described inner cladding region (6) is less than the refractive index of refractive index inverse-guiding fibre core (2) and sub-wavelength diameter fibre core (5), and greater than outer cladding region (7) refractive index; Inner cladding region (6) and outer cladding region (7) constitute by the equally distributed solid material of refractive index.
2. refractive index inverse-guiding multi-core optical fiber according to claim 1, the core diameter that it is characterized in that described refractive index inverse-guiding fibre core (2) is a micron order, the core diameter of sub-wavelength diameter fibre core (5) is in hundred nanometer scale, and the distance of sub-wavelength diameter fibre core (5) and refractive index inverse-guiding fibre core (2) is in wavelength magnitude.
3. refractive index inverse-guiding multi-core optical fiber according to claim 1 is characterized in that described refractive index inverse-guiding fibre core (2) closely arrangement each other.
4. refractive index inverse-guiding multi-core optical fiber according to claim 1, what it is characterized in that inner cladding region (6) is shaped as rectangle or polygon.
5. refractive index inverse-guiding multi-core optical fiber according to claim 1, it is characterized in that low-refraction part (4) in the refractive index inverse-guiding fibre core (2) is at least a of doped with rare-earth elements neodymium, erbium, ytterbium, thulium, lanthanum, go back adulterated al, phosphorus, at least a quartz glass of fluoride, silicate glass, phosphate glass simultaneously, or tellurate glass.
6. refractive index inverse-guiding multi-core optical fiber according to claim 1, the host material that it is characterized in that described sub-wavelength diameter fibre core (5), inner cladding region (6) and outer cladding region (7) is quartz glass, silicate glass, phosphate glass, or tellurate glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200746879U CN201083847Y (en) | 2007-09-14 | 2007-09-14 | Refractive index reverse guiding multi-core optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200746879U CN201083847Y (en) | 2007-09-14 | 2007-09-14 | Refractive index reverse guiding multi-core optical fiber |
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| CN201083847Y true CN201083847Y (en) | 2008-07-09 |
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| CNU2007200746879U Expired - Fee Related CN201083847Y (en) | 2007-09-14 | 2007-09-14 | Refractive index reverse guiding multi-core optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852889A (en) * | 2010-05-17 | 2010-10-06 | 哈尔滨工程大学 | Variable-period type array multi-core optical fiber and preparation method thereof |
| CN103415795A (en) * | 2011-03-02 | 2013-11-27 | 株式会社藤仓 | Multicore fiber |
-
2007
- 2007-09-14 CN CNU2007200746879U patent/CN201083847Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852889A (en) * | 2010-05-17 | 2010-10-06 | 哈尔滨工程大学 | Variable-period type array multi-core optical fiber and preparation method thereof |
| CN101852889B (en) * | 2010-05-17 | 2012-12-19 | 哈尔滨工程大学 | Variable-period type array multi-core optical fiber and preparation method thereof |
| CN103415795A (en) * | 2011-03-02 | 2013-11-27 | 株式会社藤仓 | Multicore fiber |
| CN103415795B (en) * | 2011-03-02 | 2014-12-10 | 株式会社藤仓 | Multicore fiber |
| US8965165B2 (en) | 2011-03-02 | 2015-02-24 | Fujikura Ltd. | Multicore fiber |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080709 Termination date: 20091014 |