CN103091769B - A kind of annular microstructured optical fibers - Google Patents
A kind of annular microstructured optical fibers Download PDFInfo
- Publication number
- CN103091769B CN103091769B CN201210582476.1A CN201210582476A CN103091769B CN 103091769 B CN103091769 B CN 103091769B CN 201210582476 A CN201210582476 A CN 201210582476A CN 103091769 B CN103091769 B CN 103091769B
- Authority
- CN
- China
- Prior art keywords
- medium post
- center
- optical fiber
- post
- fiber optic
- 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.)
- Active
Links
Landscapes
- Lasers (AREA)
Abstract
The present invention discloses a kind of annular microstructured optical fibers, and this optical fiber is made up of host material (1) and first medium post (2) and the second index medium post (3).Wherein fibre core (4) is positioned at the center of optical fiber, is made up of host material.The center of first medium post (2) be arranged in equally spacedly with fiber optic hub be one of the center of circle circumferentially; The center of second medium post (3) be arranged in equally spacedly with fiber optic hub be the center of circle another circumferentially; The distance of first medium post (2) center and fiber optic hub is L
1, the distance of second medium post (3) center and fiber optic hub is L
2, and have L
1>15 μm and L
2>L
1.The first medium post (2) that this optical fiber utilizes diameter less forms constraint to optical fiber basic mode, and the second medium post (3) utilizing diameter larger reduces the bending loss of optical fiber basic mode, achieves the object of single mode, large mould field, low bend loss transmission.
Description
Technical field
The present invention relate to symmetric fiber structure particularly relate to large mould field, low bend loss characteristic and effectively keep the microstructured optical fibers of single mode operation.
Background technology
Photonic crystal fiber and the micro-air of silicon dioxide were suggested in first time nineteen ninety-five, because this optical fiber is in ultra wideband transmissions, super continuous spectrums generation, high power light transmission, light amplification and the special applications in other functional device instruments, therefore cause the interest of numerous researcher.Bending loss is considered to be in a unfavorable factor of optical transport aspect usually.
After photonic crystal fiber is suggested and is successful, people start to attempt adopting photonic crystals optical fiber structure to make large mould field optical fiber.Because photonic crystal fiber can realize endless single mode transmission in theory, therefore, photonic crystals optical fiber structure is adopted can to realize the single mode transport of super large mode field area.At present, the mode field diameter experimentally having made successful single mould photon crystal optical fiber can reach 100 μm.But its bending property is very poor.Although can realize single mode transport in theory, in fact, present major part is all poor by loss decay, removes high-order mode, i.e. high-order mode loss comparatively large (generally at 1 more than dB/m), and fundamental mode loss lower (generally at 0.1 below dB/m).The method effectively realizing the single mode transport of LMA reveals an optical fiber with passage exactly, as the LCF surrounding fibre core with one deck airport that Dong proposes, but is difficult to for the manufacture craft of airport.K. the people such as Iizawa is by obtaining single mode transport in the method for fibre core doping ytterbium and coupling, but the high-order mode loss of this optical fiber is less than 1dB/m, can not eliminate completely and reach single mode transport.
Number of patent application be 200610119574.6 " large-mode-area double-cladding single-mode optical fiber " disclose a kind of single mode large mould field optical fiber, fiber core radius can reach 72 μm, but the bending loss problem of unresolved optical fiber, and complicated structure, is unfavorable for making.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide one filtering high-order mode effectively, there is the large mould field microstructured optical fibers of lower bending loss.
Technical scheme of the present invention is: a kind of annular microstructured optical fibers, comprises fibre core and covering, and described covering is made up of host material, first medium post and second medium post; Described fibre core is host material composition, is positioned at the center of optical fiber; The center of described first medium post be arranged in equally spacedly with fiber optic hub be the center of circle circumferentially, the center of described second medium post be arranged in equally spacedly with fiber optic hub be the center of circle another circumferentially; The center of described first medium post and the distance of fiber optic hub are L
1, the distance of second medium post center and fiber optic hub is L
2, then L
1>15 μm and L
2>L
1; The diameter d of described first medium post
1with the diameter d of described second medium post
2meet d
1< d
2; Described first medium post is identical with the refractive index of described second medium post, and lower than the refractive index of host material.
The quantity N of described first medium post
1>=12, the quantity N of described second medium post
2be 4 ~ 12.
The diameter d of described first medium post
1meet 5>=d
1>=2 μm; The diameter d of described second medium post (3)
2meet 1.5 π L
2/ N
2>=d
2>=0.4 π L
2/ N
2.
The distance L of described first medium post center and fiber optic hub
1with the distance L of described second medium post center and fiber optic hub
2between meet: 4L
1>L
2>1.5L
1.
The refractive index n of described first medium post and described second medium post
rodwith the refractive index n of host material
claddifference meet: n
clad-n
rod=0.001 ~ 0.01.
Technique effect of the present invention is: to arrange the less low refractive index dielectric post of one deck diameter at fiber core, form lower index layer, thus effectively fetter light, make optical fiber basic mode have lower bending loss.Low refractive index dielectric post is arranged in the surrounding centered by fibre core, thus makes optical fiber foundational model field have more circular symmetry.Simultaneously, outside this low refractive index dielectric post, arrange that one deck diameter is comparatively large, gap is also larger between dielectric posts low refractive index dielectric post, to reduce constraint loss and the bending loss of basic mode, simultaneously, because the gap between dielectric posts is large, thus ensure that optical fiber high-order mode light can effectively be revealed, reach the object of single mode transport.Thus achieve the object of single mode, large mould field, low bend loss transmission.Because covering only adopts two-layer hole, structure simple symmetric, ensure that covering has less size.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of embodiments of the invention;
The constraint damage curve of optical fiber basic mode and high-order mode when Fig. 2 is the diameter change of Fig. 1 first medium post 2.
Fig. 3 is the constraint damage curve of Fig. 1 first medium post 2 optical fiber basic mode and high-order mode when getting different central angle.
Fig. 4 gets the basic mode of different-diameter and the damage curve of high-order mode for second medium post 3 in structure shown in Fig. 1.
The bending loss that Fig. 5 is structured optical fiber basic mode shown in figure (1) is with the change curve of fiber bending radius.
Wherein: 1-host material, 2-first medium post 2,3-second medium post 3,4-fibre core.
Embodiment
Fig. 1 gives the cross sectional representation of a kind of embodiment of the present invention, and fibre core 4 is surrounded by the low refractive index dielectric post that two-layer diameter is different.Wherein the diameter of first medium post 2 is less, arranges closeer, and the spacing of the diameter of first medium post 2 and adjacent first medium post 2 is larger.Theoretical by photonic crystal fiber, the cladding structure of the dielectric posts composition that spacing is less, the refractive index of its equivalence is lower, therefore, can straight wave guide and bending time hold onto optical fiber basic mode to a certain extent.But owing to only having one deck dielectric posts, it fetters the limited in one's ability of light, and the high-order mode energy of optical fiber is easier in clad region expansion, and therefore, the high-order mode of optical fiber still can keep high loss.
If optical fiber is only made up of host material 1 and first medium post 2, the loss difference of its basic mode and high-order mode is very little.Optical fiber basic mode and the constraint damage curve of high-order mode when Fig. 2 provides the diameter change of first medium post 2.As seen from the figure, both differences are less, and optical fiber fundamental mode loss is comparatively large, is not suitable for practical application.
Theoretical by photonic crystal fiber, introduce multilayer low refractive index dielectric post and effectively can fetter light.But in the optical fiber of large mould field, because core size is large, introduces two-layer low-refraction post and the high-order mode loss of optical fiber can be made very little, the object of single mode transport cannot be realized.Such as, as example in Fig. 2, when the diameter getting first medium post 2 is 5 μm, if only have one deck dielectric posts, its high-order mode constraint loss is 2.98 dB/m, if increase the low refractive index dielectric post that one deck diameter is identical, identical with first medium post 2 spacing outside it again, then the constraint loss of basic mode, high-order mode is down to 0.51dB/m, 2.13dB/m respectively.Therefore, optical fiber is still non-single-mode fiber.
For this reason, we increase outside first medium post 2, and one deck distance fibre core is comparatively far away, diameter is comparatively large, the smaller second medium post 3 of the spacing of its diameter and dielectric posts to realize reducing fundamental mode loss, keep the object of the high loss of high-order mode simultaneously.Can the effect of second medium post 3 like this: if without first medium post 2, then fiber core be by second medium post 3 surround to fetter light.Because second medium post 3 is far away apart from fibre core, its diameter is larger with second medium post 3 spacing, therefore it is similar to the photonic crystal fiber only having single layer hole to form, and is single mode transport, and namely high-order mode can let out from the space of second medium post 3.Therefore the introducing of second medium post 3, can not produce considerable influence to the high-order mode loss of optical fiber.But second medium post 3 can reduce constraint loss and the bending loss of optical fiber basic mode effectively.Such as, after second medium post 3 is introduced, its basic mode constraint loss can reduce by 1200 times.
The cladding regions effective refractive index formed due to first medium post 2 and host material 1 should be lower, and therefore, the diameter of first medium post 2 should be less, simultaneously its quantity N
1should be more, namely first medium post 2 is arranged closeer.And second medium post 3 will fetter basic mode and leak high-order mode, therefore, its diameter should be comparatively large, its quantity N simultaneously
2less.Especially, the diameter d of second medium post 3 should be had
2meet 1.5 π L
2/ N
2>=d
2>=0.4 π L
2/ N
2.Namely the diameter of second medium post 3 is not more than 0.75 with the ratio of the spacing of adjacent second medium post 3, thus meet make high-order mode loss remain on higher requirement.
If second medium post 3 is very near apart from first medium post 2, then the space that high-order mode is leaked diminishes, and therefore, second medium post 3 should maintain a certain distance with first medium post 2.If but excessively far it can be made again to fetter basic mode declines.Therefore, require: the distance L of first medium post 2 center and fiber optic hub
1, the distance L of second medium post 3 center and fiber optic hub
2between meet: 4L
1>L
2>1.5L
1.
When Fig. 3 is second medium post 3 parameter constant, the adjacent central angle θ of internal layer first medium post 2 from 6 ° to 15 °, diameter d
1high-order mode during from 2 μm to 5 μm and the constraint loss of basic mode and loss ratio.As seen from the figure, the diameter increasing second medium post 3 can improve the loss ratio of high-order mode and basic mode, realizes good single mode transport.
Fig. 4 is the L of second medium post 3
2do not become 60 μm, internal layer hole central angle is 15 °, diameter d
1when being 5 μm, the constraint loss of high-order mode and basic mode and diameter d
2variation relation.As seen from the figure, when the normalization diameter of outer hole is about 0.7, loss ratio reaches maximum.
Fig. 5 is second medium post 3 diameter d
2=42 μm, L
2=59 μm, internal layer hole central angle θ is 18 °, diameter d
1when being 4 μm, the bending loss of basic mode and the variation relation of fiber bending radius.Can find from figure, when bending radius is 0.5m, bending loss is less than 0.1 dB/m.
Be host material below with quartz be example, the transport property of optical fiber is described.During practical application, can according to different host materials and host material the wavelength coverage that is suitable for select corresponding optical fiber structure.
embodiment:
The cross-sectional structure of optical fiber as shown in Figure 1.Host material adopts pure quartz, and Porous materials adopts the quartz material of doping.The diameter d of first medium post 2
1=5 μm, with fiber optic hub spacing L
1=30 μm, quantity N
1=20.The diameter d of second medium post 3
2=42 μm, with fiber optic hub spacing L
2=60 μm, quantity N
2=6.The refractive index ratio host material of low refractive index dielectric post is low by 0.004.When transmission wavelength is 1064 nm, the foundational model field area when straight optical fiber can reach 1498 μm
2, when bending radius is 50 cm, the mode field area of basic mode is 1384 μm
2.Optical fiber bending loss when bending radius is 50cm is 0.095dB/m.During straight optical fiber, its basic mode leakage loss is less than 0.002dB/m, and high-order mode loss is greater than 1.11dB/m.
Above-mentioned accompanying drawing is only explanatory view, does not form restriction to protection scope of the present invention.Should be understood that these embodiments just in order to demonstrate the invention, but not limit the scope of the invention by any way.
Claims (3)
1. a large mould field single mode annular microstructured optical fibers, comprises fibre core (4) and covering, it is characterized in that: described covering is made up of host material (1), first medium post (2) and second medium post (3); Described fibre core (4) is host material composition, is positioned at the center of optical fiber; The center of described first medium post (2) be arranged in equally spacedly with fiber optic hub be the center of circle circumferentially, the center of described second medium post (3) be arranged in equally spacedly with fiber optic hub be the center of circle another circumferentially; The described center of first medium post (2) and the distance of fiber optic hub are L
1, the distance of second medium post (3) center and fiber optic hub is L
2, then L
1>15 μm and L
2>L
1; The diameter d of described first medium post (2)
1with the diameter d of described second medium post (3)
2meet d
1<d
2; Described first medium post (2) is identical with the refractive index of described second medium post (3), and lower than the refractive index of host material (1); The diameter d of described first medium post (2)
1meet 5>=d
1>=2 μm; The diameter d of described second medium post (3)
2meet 1.5 π L
2/ N
2>=d
2>=0.4 π L
2/ N
2; The distance L of described first medium post (2) center and fiber optic hub
1with the distance L of described second medium post (3) center and fiber optic hub
2between meet: 4L
1>L
2>1.5L
1.
2. one according to claim 1 large mould field single mode annular microstructured optical fibers, is characterized in that: the quantity N of described first medium post (2)
1>=12, the quantity N of described second medium post (3)
2be 4 ~ 12.
3. one according to claim 1 large mould field single mode annular microstructured optical fibers, is characterized in that: the refractive index n of described first medium post (2) and described second medium post (3)
rodwith the refractive index n of host material (1)
claddifference meet: n
clad-n
rod=0.001 ~ 0.01.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210582476.1A CN103091769B (en) | 2012-12-28 | 2012-12-28 | A kind of annular microstructured optical fibers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210582476.1A CN103091769B (en) | 2012-12-28 | 2012-12-28 | A kind of annular microstructured optical fibers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103091769A CN103091769A (en) | 2013-05-08 |
| CN103091769B true CN103091769B (en) | 2015-08-26 |
Family
ID=48204561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210582476.1A Active CN103091769B (en) | 2012-12-28 | 2012-12-28 | A kind of annular microstructured optical fibers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103091769B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316991B (en) * | 2014-11-05 | 2017-10-31 | 国家电网公司 | Flat-top photon band-gap optical fiber |
| KR101874694B1 (en) | 2016-03-28 | 2018-07-04 | 한국과학기술원 | Waveguide for transmission of electomagnetic signal |
| CN109188598B (en) * | 2018-10-15 | 2019-11-01 | 燕山大学 | A kind of super model microstructured optical fibers being used for transmission orbital angular momentum |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449504A (en) * | 2000-08-25 | 2003-10-15 | 悉尼大学 | Polymer optical waveguide |
| JP2009230080A (en) * | 2008-03-25 | 2009-10-08 | Nippon Telegr & Teleph Corp <Ntt> | Photonic crystal fiber |
| CN101625438A (en) * | 2009-08-11 | 2010-01-13 | 长飞光纤光缆有限公司 | Bend insensitive single mode optic fiber with large effective area and manufacturing method thereof |
| US7970248B2 (en) * | 2004-12-30 | 2011-06-28 | Imra America, Inc. | Photonic bandgap fibers |
| CN102375176A (en) * | 2011-11-11 | 2012-03-14 | 江苏大学 | Low-bending-loss optical fiber |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2083291B1 (en) * | 2004-07-13 | 2012-07-04 | Fujikura, Ltd. | Low bending loss multimode holey fiber |
-
2012
- 2012-12-28 CN CN201210582476.1A patent/CN103091769B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449504A (en) * | 2000-08-25 | 2003-10-15 | 悉尼大学 | Polymer optical waveguide |
| US7970248B2 (en) * | 2004-12-30 | 2011-06-28 | Imra America, Inc. | Photonic bandgap fibers |
| JP2009230080A (en) * | 2008-03-25 | 2009-10-08 | Nippon Telegr & Teleph Corp <Ntt> | Photonic crystal fiber |
| CN101625438A (en) * | 2009-08-11 | 2010-01-13 | 长飞光纤光缆有限公司 | Bend insensitive single mode optic fiber with large effective area and manufacturing method thereof |
| CN102375176A (en) * | 2011-11-11 | 2012-03-14 | 江苏大学 | Low-bending-loss optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103091769A (en) | 2013-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10197727B2 (en) | Large core holey fibers | |
| Dong et al. | All-glass large-core leakage channel fibers | |
| CN104678484B (en) | A kind of more core single-mode fibres and its manufacturing method | |
| US8406594B2 (en) | Optical fiber with resonant structure of cladding features connected to light sink | |
| CN103323910B (en) | Double-clad optical fiber | |
| KR102003689B1 (en) | A spatially modulated cladding mode stripper and optical fiber therewith | |
| CN103645536B (en) | A kind of all solid state large mould field photon band-gap optical fiber | |
| CN110221381B (en) | Node type hollow anti-resonance photonic crystal fiber and preparation method thereof | |
| WO2015011706A1 (en) | Single large mode cladding amplification in active double-clad fibers | |
| CN101122651A (en) | Cladding gain guide microstructure hollow optical fiber | |
| CN103091769B (en) | A kind of annular microstructured optical fibers | |
| Ma et al. | Design and analysis of a modified segmented cladding fiber with large mode area | |
| Xing et al. | Large mode area double-layer all-solid anti-resonant fiber for high-power fiber lasers | |
| Belardi et al. | Negative curvature fibers with reduced leakage loss | |
| Hao et al. | Optimized design of unsymmetrical gap nodeless hollow core fibers for optofluidic applications | |
| CN104635296A (en) | Long-distance laser energy transmission optical fiber | |
| CN103439763B (en) | A kind of total solid optical fiber with large-mode field area and manufacture method thereof | |
| CN102368103B (en) | Microstructure optical fiber with large mode area | |
| Wang et al. | Design and analysis for large-mode-area photonic crystal fiber with negative-curvature air ring | |
| CN102819062B (en) | Air hole square array fiber core annular doping four-core photonic crystal fiber | |
| Chen et al. | Design of all-solid large-mode area microstructured-core optical fibers | |
| CN102023335B (en) | Large-mode-area microstructure optical fiber | |
| Lu et al. | Low‐loss all‐solid antiresonant fiber for flat‐top beam generation | |
| Priyambada et al. | Analysis of effective area and splicing loss behavior of square and hexagonal photonic crystal fiber | |
| Shen et al. | Mode transmission performance study of a novel heterogeneous helical cladding fiber with an isolation ring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 212114 Zhenjiang, Zhejiang Province, Dantu high capital street, Xiangshan Road, No. 1 Patentee after: Jiangsu University Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: Jiangsu University |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20210201 Address after: 226001 room 1002, Huali building, No.6 Gongnong Road, Chongchuan District, Nantong City, Jiangsu Province Patentee after: Nantong Ningjing Information Technology Co.,Ltd. Address before: 212114 No. 1 Xiangshan Road, high street, Dantu District, Zhenjiang, Jiangsu Patentee before: JIANGSU University |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210805 Address after: No.10, Rongyuan Road, Huayuan Industrial Zone, Binhai New Area, Tianjin 300450 Patentee after: Tianjin Futong Information Technology Co.,Ltd. Address before: 226001 room 1002, Huali building, No.6 Gongnong Road, Chongchuan District, Nantong City, Jiangsu Province Patentee before: Nantong Ningjing Information Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right |