CN103091769A - Ring-shaped microstructure fiber - Google Patents
Ring-shaped microstructure fiber Download PDFInfo
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- CN103091769A CN103091769A CN2012105824761A CN201210582476A CN103091769A CN 103091769 A CN103091769 A CN 103091769A CN 2012105824761 A CN2012105824761 A CN 2012105824761A CN 201210582476 A CN201210582476 A CN 201210582476A CN 103091769 A CN103091769 A CN 103091769A
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Abstract
The invention discloses a ring-shaped microstructure fiber which is formed by host material (1), first medium columns (2) and second refractive index medium columns (3). A fiber core (4) is located at the center of the fiber and is formed by host material. The centers of the first medium columns (2) are distributed on a circumference at equal intervals, wherein the circumference uses the center of the fiber as the circle center. The centers of the second medium columns (3) are distributed on another circumference at equal intervals, wherein the circumference uses the center of the fiber as the circle center. The distance between the centers of the first medium columns (2) and the center of the fiber is L1, the distance between the centers of the second medium columns (3) and the center of the fiber is L2, L1 is larger than 15 mu m, and L2 is larger than L1. The fiber uses the first medium columns (2) with small diameters to bind a fiber fundamental mode, uses the second medium columns (3) with large diameters to reduce bending loss of the fiber fundamental mode, and achieves the goals of a single mode, a large mode field and low bending loss transmission.
Description
Technical field
The present invention relates to the symmetric fiber structure and relates in particular to large mould field, the microstructured optical fibers low bend loss characteristic and that effectively keep single mode operation.
Background technology
Photonic crystal fiber and silicon dioxide microvoid gas were suggested for the first time in nineteen ninety-five, because this optical fiber generates at ultra wideband transmissions, super continuous spectrums, the high power light transmission, therefore special applications in light amplification and other functional device instruments has caused numerous researchers' interest.Bending loss is considered to be in a unfavorable factor of light transmission aspect usually.
After photonic crystal fiber was suggested and is successful, people began attempt to adopt photonic crystals optical fiber structure to make large mould field optical fiber.Because photonic crystal fiber in theory can be realized the endless single mode transmission, therefore, adopt photonic crystals optical fiber structure can realize the single mode transport of super large mode field area.At present, the mode field diameter of experimentally having made the single mould photon crystal optical fiber of merit can reach 100 μ m.But its bending property is very poor.Although can realize single mode transport in theory, in fact, now major part is all decay poorly by loss, removes high-order mode, i.e. high-order mode loss is (generally more than 1 dB/m) greatly, and fundamental mode loss lower (generally below 0.1 dB/m).A kind ofly realize that effectively the method for the single mode transport of LMA reveals optical fiber with passage exactly, surround the LCF of fibre core as what Dong proposed with one deck airport, but be difficult to for the manufacture craft of airport.K. the people such as Iizawa is by obtaining single mode transport at fibre core doping ytterbium and coupled method, but the high-order mode loss of this optical fiber is less than 1dB/m, can not eliminate fully to reach single mode transport.
Number of patent application is that 200610119574.6 " large-mode-area double-cladding single-mode optical fiber " discloses the large mould of a kind of single mode field optical fiber, and fiber core radius can reach 72 μ m, but the bending loss problem of unresolved optical fiber, and complicated structure, be unfavorable for making.
Summary of the invention
For the deficiencies in the prior art, the purpose of this invention is to provide a kind of filtering high-order mode effectively, have 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, comprise fibre core and covering, and described covering is comprised of host material, first medium post and second medium post; Described fibre core is that host material forms, and is positioned at the center of optical fiber; The center of described first medium post is arranged on circumference take fiber optic hub as the center of circle equally spacedly, and the center of described second medium post is arranged on another circumference take fiber optic hub as the center of circle equally spacedly; 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, L
115 μ m and L
2L
1The diameter d of described first medium post
1Diameter d with described second medium post
2Satisfy d
1＜d
2Described 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
1Satisfy 5 〉=d
1〉=2 μ m; The diameter d of described second medium post (3)
2Satisfy 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
1Distance L with described second medium post center and fiber optic hub
2Between satisfy: 4L
1L
21.5L
1
The refractive index n of described first medium post and described second medium post
rodRefractive index n with host material
CladDifference satisfy: n
Clad-n
rod=0.001 ~ 0.01.
Technique effect of the present invention is: the less low refractive index dielectric post of one deck diameter of arranging around fibre core, and form lower index layer, thereby effectively fetter light, make the optical fiber basic mode have lower bending loss.With the low refractive index dielectric post be arranged in centered by fibre core around on, thereby make optical fiber basic mode mould field have more circular symmetry.Simultaneously, arrange in this low refractive index dielectric post outside that one deck diameter is large, also larger low refractive index dielectric post of medium post gap, to reduce constraint loss and the bending loss of basic mode, simultaneously, because the gap between the medium post is large, thereby guarantee that optical fiber high-order mode light can effectively be revealed, reach the purpose of single mode transport.Thereby realized the purpose of single mode, large mould field, low bend loss transmission.Because covering only adopts two-layer hole, symmetry simple in structure has guaranteed that covering has less size.
Description of drawings
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 vary in diameter 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 is that in structure shown in Figure 1, second medium post 3 is got the basic mode of different-diameter and the damage curve of high-order mode.
Fig. 5 is that the bending loss of 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 has provided the cross sectional representation of a kind of embodiment of the present invention, and fibre core 4 is surrounded by the different low refractive index dielectric post of two-layer diameter.Wherein the diameter of first medium post 2 is less, arrange closeer, and the spacing of the diameter of first medium post 2 and adjacent first medium post 2 is larger.The cladding structure theoretical by photonic crystal fiber, that the medium post that spacing is less forms, its equivalent refractive index is lower, therefore, can hold onto to a certain extent the optical fiber basic mode when straight wave guide and bending.But owing to only having one deck medium post, it fetters the limited in one's ability of light, and the high-order mode energy of optical fiber is easier in the clad region expansion, and therefore, the high-order mode of optical fiber still can keep high loss.
If optical fiber only is comprised of host material 1 and first medium post 2, the loss difference of its basic mode and high-order mode is very little.The constraint damage curve of optical fiber basic mode and high-order mode when Fig. 2 provides the vary in diameter of first medium post 2.As seen from the figure, both differ less, and the optical fiber fundamental mode loss is larger, is not suitable for practical application.
Theoretical by photonic crystal fiber, introduce multilayer low refractive index dielectric post and can effectively fetter light.But in the optical fiber of large mould field, because core size is large, introduces two-layer low-refraction post and can make the high-order mode loss of optical fiber very little, can't realize the purpose of single mode transport.For example, as example in Fig. 2, when the diameter of getting first medium post 2 is 5 μ m, if only have one deck medium post, its high-order mode constraint loss is 2.98 dB/m, if increase identical, identical with the first medium post 2 spacings low refractive index dielectric post of one deck diameter in its outside, 0.51dB/m, 2.13dB/m are down to respectively in the constraint loss of basic mode, high-order mode again.Therefore, optical fiber is still non-single-mode fiber.
For this reason, we increase in first medium post 2 outsides, and one decks are far away apart from fibre core, diameter is large, the smaller second medium post 3 of its diameter and the spacing of medium post to be to realize the reduction fundamental mode loss, keep simultaneously the purpose of the high loss of high-order mode.The effect of second medium post 3 like this: if without first medium post 2, fiber core is with constraint light by 3 encirclements of second medium post.Due to second medium post 3 is far away apart from fibre core, its diameter and second medium post 3 spacings larger, so it is similar to the photonic crystal fiber that only has single layer hole to form, and is single mode transport, 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.For example, after second medium post 3 was introduced, its basic mode constraint loss can reduce by 1200 times.
The cladding regions effective refractive index that forms 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 is will fetter basic mode and leak high-order mode, and therefore, its diameter should be larger, simultaneously its quantity N
2Less.The diameter d that second medium post 3 should be arranged especially,
2Satisfy 1.5 π L
2/ N
2〉=d
2〉=0.4 π L
2/ N
2The ratio that is diameter and the spacing of adjacent second medium post 3 of second medium post 3 is not more than 0.75, makes the high-order mode loss remain on higher requirement thereby satisfy.
If second medium post 3 is very near apart from first medium post 2, the space of high-order mode leakage diminishes, and therefore, second medium post 3 should maintain a certain distance with first medium post 2.If but cross, its constraint basic mode effect is weakened.Therefore, require: the distance L of first medium post 2 centers and fiber optic hub
1, the distance L of second medium post 3 centers and fiber optic hub
2Between satisfy: 4L
1L
21.5L
1
Fig. 3 is in the situation of second medium post 3 parameter constants, and the adjacent central angle θ of internal layer first medium post 2 is from 6 ° to 15 °, diameter d
1High-order mode during from 2 μ m to 5 μ m and constraint loss and the loss ratio of basic mode.As seen from the figure, the diameter that increases 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 μ m, internal layer hole central angle is 15 °, diameter d
1When being 5 μ m, constraint loss and the diameter d of high-order mode and basic mode
2Variation relation.As seen from the figure, when the normalization diameter of outer hole was 0.7 left and right, it is maximum that loss ratio reaches.
Fig. 5 is second medium post 3 diameter d
2=42 μ m, L
2=59 μ m, internal layer hole central angle θ is 18 °, diameter d
1When being 4 μ m, the bending loss of basic mode and the variation relation of fiber bending radius.Can find from figure, when bending radius was 0.5m, bending loss was less than 0.1 dB/m.
Below take in quartz as example as host material, the transport property of optical fiber is described.During practical application, can select corresponding optical fiber structure according to the different wavelength coverages that host material and host material were suitable for.
Embodiment:
The cross-sectional structure of optical fiber as shown in Figure 1.Host material adopts pure quartz, and the hole material adopts the quartz material of doping.The diameter d of first medium post 2
1=5 μ m are with fiber optic hub spacing L
1=30 μ m, quantity N
1=20.The diameter d of second medium post 3
2=42 μ m are with fiber optic hub spacing L
2=60 μ m, quantity N
2=6.The refractive index ratio host material of low refractive index dielectric post low 0.004.When transmission wavelength was 1064 nm, the basic mode mode field area when straight optical fiber can reach 1498 μ m
2, when bending radius was 50 cm, the mode field area of basic mode was 1384 μ m
2When optical fiber is 50cm in bending radius, bending loss is 0.095dB/m.During straight optical fiber, its basic mode leakage loss is less than 0.002dB/m, and the high-order mode loss is greater than 1.11dB/m.
Above-mentioned accompanying drawing is only explanatory view, protection scope of the present invention is not formed restriction.Should be understood that these embodiment just in order to demonstrate the invention, but not limit the scope of the invention by any way.
Claims (5)
1. an annular microstructured optical fibers, comprise fibre core (4) and covering, it is characterized in that: described covering is comprised of host material (1), first medium post (2) and second medium post (3); Described fibre core (4) is positioned at the center of optical fiber for host material forms; The center of described first medium post (2) is arranged on circumference take fiber optic hub as the center of circle equally spacedly, and the center of described second medium post (3) is arranged on another circumference take fiber optic hub as the center of circle equally spacedly; The center of described 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, L
115 μ m and L
2L
1The diameter d of described first medium post (2)
1Diameter d with described second medium post (3)
2Satisfy d
1＜d
2Described 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).
2. a kind of annular microstructured optical fibers according to claim 1, 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. a kind of annular microstructured optical fibers according to claim 1, is characterized in that: the diameter d of described first medium post (2)
1Satisfy 5 〉=d
1〉=2 μ m; The diameter d of described second medium post (3)
2Satisfy 1.5 π L
2/ N
2〉=d
2〉=0.4 π L
2/ N
2
4. a kind of annular microstructured optical fibers according to claim 1, is characterized in that: the distance L of described first medium post (2) center and fiber optic hub
1Distance L with described second medium post (3) center and fiber optic hub
2Between satisfy: 4L
1L
21.5L
1
5. a kind of annular microstructured optical fibers according to claim 1, is characterized in that: the refractive index n of described first medium post (2) and described second medium post (3)
rodRefractive index n with host material (1)
CladDifference satisfy: n
Clad-n
rod=0.001 ~ 0.01.
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|---|---|---|---|
| CN201210582476.1A CN103091769B (en) | 2012-12-28 | 2012-12-28 | A kind of annular microstructured optical fibers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210582476.1A CN103091769B (en) | 2012-12-28 | 2012-12-28 | A kind of annular microstructured optical fibers |
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| CN103091769A true CN103091769A (en) | 2013-05-08 |
| CN103091769B CN103091769B (en) | 2015-08-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316991A (en) * | 2014-11-05 | 2015-01-28 | 国家电网公司 | Flat-top photonic band gap fiber |
| CN109188598A (en) * | 2018-10-15 | 2019-01-11 | 燕山大学 | A kind of super model microstructured optical fibers being used for transmission orbital angular momentum |
| CN109314297A (en) * | 2016-03-28 | 2019-02-05 | 韩国科学技术院 | It is used for transmission the waveguide of electromagnetic wave signal |
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| CN1449504A (en) * | 2000-08-25 | 2003-10-15 | 悉尼大学 | Polymer optical waveguide |
| EP2083291A2 (en) * | 2004-07-13 | 2009-07-29 | Fujikura, Ltd. | Hole-assisted holey fiber and low bending loss multimode holey fiber |
| 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 |
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2012
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1449504A (en) * | 2000-08-25 | 2003-10-15 | 悉尼大学 | Polymer optical waveguide |
| EP2083291A2 (en) * | 2004-07-13 | 2009-07-29 | Fujikura, Ltd. | Hole-assisted holey fiber and low bending loss multimode holey fiber |
| 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 |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316991A (en) * | 2014-11-05 | 2015-01-28 | 国家电网公司 | Flat-top photonic band gap fiber |
| CN104316991B (en) * | 2014-11-05 | 2017-10-31 | 国家电网公司 | Flat-top photon band-gap optical fiber |
| CN109314297A (en) * | 2016-03-28 | 2019-02-05 | 韩国科学技术院 | It is used for transmission the waveguide of electromagnetic wave signal |
| US10777868B2 (en) | 2016-03-28 | 2020-09-15 | Korea Advanced Institute Of Science And Technology | Waveguide comprising first and second dielectric parts, where the first dielectric part comprises two or more separate dielectric parts |
| US10777865B2 (en) | 2016-03-28 | 2020-09-15 | Korea Advanced Institute Of Science And Technology | Chip-to-chip interface comprising a waveguide with a dielectric part and a conductive part, where the dielectric part transmits signals in a first frequency band and the conductive part transmits signals in a second frequency band |
| CN109314297B (en) * | 2016-03-28 | 2022-04-26 | 韩国科学技术院 | Waveguide for transmitting electromagnetic wave signals |
| CN109188598A (en) * | 2018-10-15 | 2019-01-11 | 燕山大学 | A kind of super model microstructured optical fibers being used for transmission orbital angular momentum |
| 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 |
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