CN100495093C - Strong coupling multiple core optical fiber - Google Patents
Strong coupling multiple core optical fiber Download PDFInfo
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- CN100495093C CN100495093C CNB2007100460132A CN200710046013A CN100495093C CN 100495093 C CN100495093 C CN 100495093C CN B2007100460132 A CNB2007100460132 A CN B2007100460132A CN 200710046013 A CN200710046013 A CN 200710046013A CN 100495093 C CN100495093 C CN 100495093C
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Abstract
A strong coupling multi-core optical fiber includes a core area, an internal cladding area and an external cladding area. The optical fiber is characterized in that the core area includes a plurality of large cores and a plurality of sub-wavelength cores arranged in the internal cladding area; the refractive index of the internal cladding area is smaller than that of the large core and the sub-wavelength core but larger than that of the external cladding area; the internal and external cladding areas are both made of solid material with evenly distributed refractive index; the diameter of the large core is in micron dimension, the distance between adjacent large cores is in micron dimension and the diameter of the sub-wavelength core is in hundred micron dimension. The invention has the functions of strong coupling, phase locking, laser shaping and homogenization.
Description
Technical field
The present invention relates to optical fiber, especially a kind of multi-core fiber of strong coupling.
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 streamline 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.
In recent years, because the final output power of simple optical fiber is restricted, the coherent beam combination technology grows up thereupon.Because the coherent beam combination technology can make the multi-path laser bundle by coherence stack, the beam quality that last output power guarantees when being improved.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 generally to realize phase-locked very strictly from the requirement of, fibre core size, not be easy to realize fibre core spacing.
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 426816-819,2003].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 objective of the invention is to overcome the deficiency that multi-core fiber is not easy to realize strong coupling, a kind of multi-core fiber of strong coupling is provided.This multi-core fiber can make many fibre core strong couplings realizes the phase locking of many fibre cores, and can carry out spacing shaping to the laser that imports, and can be applied in fields such as laser shaping, homogenising and high power optical fibre laser beam combination.
Technical solution of the present invention is as follows:
A kind of multi-core fiber of strong coupling comprises core region, inner cladding region and outer cladding region, it is characterized in that described core region comprises many big core diameter fibre cores and Duo Gen sub-wavelength diameter fibre core and is arranged in described inner cladding region; The refractive index of described inner cladding region is less than the refractive index of big core diameter fibre core and sub-wavelength diameter fibre core, but greater than the refractive index of described outer cladding region; Described inner cladding region and outer cladding region constitute by the equally distributed solid material of refractive index, the diameter of described big core diameter fibre core is in micron dimension, distance between the adjacent big core diameter fibre core is in micron dimension, and the core diameter of described sub-wavelength diameter fibre core is in hundred nanometer scale.
Described big core diameter fibre core is a single-mode fiber.
Described big core diameter fibre core is identical with the refractive index of sub-wavelength diameter fibre core.
The arrangement that is centrosymmetric of big core diameter fibre core in the described inner cladding region, and sub-wavelength diameter fibre core is between big core diameter fibre core.
The shape of described inner cladding region is rectangle or D type.
The host material of described inner cladding region and outer cladding region is quartz glass, silicate glass, phosphate glass or tellurate glass.
The host material of described big core diameter fibre core and sub-wavelength diameter core diameter is at least a of doped with rare-earth elements erbium, ytterbium, thulium, lanthanum, goes back at least a quartz glass, silicate glass, phosphate glass or the tellurate glass of adulterated al, phosphorus, fluoride simultaneously.
Technique effect of the present invention:
Described big core diameter fibre core is in micron dimension, adjacent big core diameter fibre core spacing is from micron dimension, sub-wavelength diameter fibre core core diameter is in hundred nanometer scale, can guarantee many fibre core strong couplings, realize the phase locking of many fibre cores, and can carry out spacing shaping to the laser that imports, can be applied in fields such as laser shaping, homogenising and high power optical fibre laser beam combination.
Description of drawings
Fig. 1 is the optical fiber schematic cross-section of the multi-core fiber embodiment 1 of strong coupling of the present invention.
Fig. 2 is the optical fiber schematic cross-section of the embodiment of the invention 3.
Fig. 3 is the optical fiber schematic cross-section of the embodiment of the invention 4.
Fig. 4 is the optical fiber schematic cross-section of the embodiment of the invention 5.
Embodiment
Below in conjunction with drawings and Examples the present invention is elaborated, but should not limit protection scope of the present invention with this.
Embodiment 1:
Fig. 1 is the optical fiber schematic cross-section of the embodiment 1 of the multi-core fiber of invention strong coupling, and as seen from the figure, this is that big core diameter fibre core 2 in the inner cladding region 4 is square arrangement, the strong coupling multi-core fiber of sub-wavelength diameter fibre core 3 between four big core diameter fibre cores 2.This strong coupling multi-core fiber is to embed big core diameter fibre core 2 and sub-wavelength diameter fibre core 3 in inner cladding region 4, covers outer cladding region 5 and make on inner cladding region 4.The core diameter of big core diameter fibre core 2 is 3 μ m, and sub-wavelength diameter fibre core 3 core diameters are 100nm, and inner cladding region 4 is shaped as rectangle, and size is 60 μ m * 40 μ m, and the surrounding layer diameter is 125 μ m.The refractive index of big core diameter core diameter 2 and sub-wavelength diameter fibre core 3 is 1.458, and the refractive index of inner cladding region 4 is 1.45, and outer cladding region 5 refractive indexes are 1.44.Big core diameter fibre core 2 and sub-wavelength diameter fibre core 3 all are quartz glasss of doping 2wt% ytterbium oxide, and the adulterated al ion is to improve performance simultaneously.
Embodiment 2:
Embodiment 3:
Fig. 2 is the optical fiber schematic cross-section of the embodiment of the invention 3.This is that big core diameter fibre core 2 in the inner cladding region 4 is pentagonal array, and sub-wavelength diameter fibre core 3 is positioned at five strong coupling multi-core fibers in the middle of the big core diameter fibre core 2.This strong coupling multi-core fiber is to embed big core diameter fibre core 2 and sub-wavelength diameter fibre core 3 in inner cladding region 4, covers outer cladding region 5 and make on inner cladding region 4.The diameter of big core diameter fibre core 2 is 3 μ m, and sub-wavelength diameter fibre core 3 is 100nm, and inner cladding region 4 is shaped as rectangle, and size is 60 μ m * 40 μ m, and outer cladding region 5 diameters are 125 μ m.The refractive index of big core diameter core diameter 2 and sub-wavelength diameter fibre core 3 is 1.458, and the refractive index of inner cladding region 4 is 1.45, and outer cladding region 5 refractive indexes are 1.44.The doping situation can be with reference to embodiment 1 and embodiment 2.
Embodiment 4:
Fig. 3 is the optical fiber schematic cross-section of inventive embodiment 4, and this is that big core diameter fibre core 2 in the inner cladding region 4 is hexagonal array, and sub-wavelength diameter fibre core 3 is positioned at the strong coupling multi-core fiber in the middle of the big core diameter fibre core 2 of the six roots of sensation.This strong coupling multi-core fiber is to embed big core diameter fibre core 2 and sub-wavelength diameter fibre core 3 in inner cladding region 4, covers outer cladding region 5 and make on inner cladding region 4.The diameter of big core diameter fibre core 2 is 3 μ m, and sub-wavelength diameter fibre core 3 is 100nm, and inner cladding region 4 is shaped as rectangle, and size is 60 μ m * 40 μ m, and outer cladding region 5 diameters are 125 μ m.The refractive index of big core diameter fibre core 2 and sub-wavelength diameter fibre core 3 is 1.458, and the refractive index of inner cladding region 4 is 1.45, and outer cladding region 5 refractive indexes are 1.44.The doping situation can be with reference to embodiment 1 and embodiment 2.
Embodiment 5:
Fig. 4 is the optical fiber schematic cross-section of inventive embodiment 5, this is that big core diameter fibre core (2) in the inner cladding region 4 is hexagonal array, multi-core fiber 1 center is big core diameter fibre core 2, and sub-wavelength diameter fibre core 3 is positioned at the strong coupling multi-core fiber in the middle of per three big core diameter fibre cores 2.This strong coupling multi-core fiber is to embed big core diameter fibre core 2 and sub-wavelength diameter fibre core 3 in inner cladding region 4, covers outer cladding region 5 and make on inner cladding region 4.The diameter of big core diameter fibre core 2 is 3 μ m, and sub-wavelength diameter fibre core 3 is 100nm, and inner cladding region 4 is shaped as rectangle, and size is 60 μ m * 40 μ m, and outer cladding region 5 diameters are 125 μ m.The refractive index of big core diameter fibre core 2 and sub-wavelength diameter fibre core 3 is 1.458, and the refractive index of inner cladding region 4 is 1.45, and outer cladding region 5 refractive indexes are 1.44.The doping situation can be with reference to embodiment 1 and embodiment 2.
Claims (7)
1. the multi-core fiber of a strong coupling, comprise core region, inner cladding region (4) and outer cladding region (5), it is characterized in that: described core region comprises many big core diameter fibre cores (2) and many sub-wavelength diameter fibre cores (3) and is arranged in described inner cladding region (4); Described sub-wavelength diameter fibre core (3) is positioned between the described big core diameter fibre core (2); The refractive index of described inner cladding region (4) is less than the refractive index of big core diameter fibre core (2) and sub-wavelength diameter fibre core (3), still greater than the refractive index of described outer cladding region (5); Described inner cladding region (4) and outer cladding region (5) constitute by the equally distributed solid material of refractive index, the diameter of described big core diameter fibre core (2) is in micron dimension, distance between the adjacent big core diameter fibre core is in micron dimension, and the core diameter of described sub-wavelength diameter fibre core (3) is in hundred nanometer scale.
2. strong coupling multi-core fiber according to claim 1 is characterized in that: described big core diameter fibre core (2) is the fibre core of single-mode fiber.
3. the multi-core fiber of strong coupling according to claim 1 is characterized in that: big core diameter fibre core (2) is identical with the refractive index of sub-wavelength diameter fibre core (3).
4. strong coupling multi-core fiber according to claim 1 is characterized in that: the arrangement that is centrosymmetric of the big core diameter fibre core (2) in the described inner cladding region (4).
5. the multi-core fiber of strong coupling according to claim 1, it is characterized in that: the shape of described inner cladding region (4) is a rectangle, or the D type.
6. the multi-core fiber of strong coupling according to claim 1, it is characterized in that: the host material of described inner cladding region (4) and outer cladding region (5) is quartz glass, silicate glass, phosphate glass or tellurate glass.
7. according to the multi-core fiber of each described strong coupling of claim 1 to 6, it is characterized in that: the host material of described big core diameter fibre core (2) and sub-wavelength diameter fibre core (3) is at least a in doped with rare-earth elements erbium, ytterbium, thulium and the lanthanum, goes back at least a quartz glass, silicate glass, phosphate glass or tellurate glass in adulterated al, phosphorus and the fluoride simultaneously.
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| CNB2007100460132A CN100495093C (en) | 2007-09-14 | 2007-09-14 | Strong coupling multiple core optical fiber |
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Cited By (1)
| 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 |
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| CN102203648B (en) * | 2008-10-03 | 2014-11-05 | 国立大学法人横滨国立大学 | Coupled system multi-core fiber, coupling mode multiplexer and demultiplexer, system for tranmission using multi-core fiber and method for transmission using multi-core fiber |
| JP5819682B2 (en) | 2011-09-05 | 2015-11-24 | 株式会社フジクラ | Multicore fiber for communication |
| DE102012219074A1 (en) * | 2012-10-19 | 2014-04-24 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Laser cutting machine and method for cutting workpieces of different thickness |
| US11517978B2 (en) * | 2012-10-19 | 2022-12-06 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Laser cutting machine and method for cutting workpieces of different thicknesses |
| CN103964696B (en) * | 2014-05-26 | 2017-09-15 | 山东海富光子科技股份有限公司 | The full glass of phosphate silicate for high-capacity optical fiber laser mixes optical fiber |
| JP6050847B2 (en) * | 2015-02-12 | 2016-12-21 | 株式会社フジクラ | Multi-core fiber |
| CN107918169A (en) * | 2017-10-27 | 2018-04-17 | 江苏法尔胜光子有限公司 | Active polarization maintaining optical fibre of line-styled and preparation method thereof |
| CN109143464B (en) * | 2018-11-29 | 2019-03-12 | 中聚科技股份有限公司 | A kind of rear-earth-doped glass optical fiber and preparation method thereof |
| DE102019114974A1 (en) * | 2019-06-04 | 2020-12-10 | Friedrich-Schiller-Universität Jena | optical fiber |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1359474A (en) * | 1998-09-16 | 2002-07-17 | 康宁股份有限公司 | Multicore and multimode dispersion managed fibers |
| CN201107425Y (en) * | 2007-09-14 | 2008-08-27 | 中国科学院上海光学精密机械研究所 | Strong coupling multi-core optical fiber |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1359474A (en) * | 1998-09-16 | 2002-07-17 | 康宁股份有限公司 | Multicore and multimode dispersion managed fibers |
| CN201107425Y (en) * | 2007-09-14 | 2008-08-27 | 中国科学院上海光学精密机械研究所 | Strong coupling multi-core optical fiber |
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 |
| 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 |
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