CN104503019B - Tetragonal slower rays photon band-gap optical fiber - Google Patents
Tetragonal slower rays photon band-gap optical fiber Download PDFInfo
- Publication number
- CN104503019B CN104503019B CN201510011258.6A CN201510011258A CN104503019B CN 104503019 B CN104503019 B CN 104503019B CN 201510011258 A CN201510011258 A CN 201510011258A CN 104503019 B CN104503019 B CN 104503019B
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- Prior art keywords
- tetragonal
- optical fiber
- circular column
- photon band
- slower rays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02323—Core having lower refractive index than cladding, e.g. photonic band gap guiding
- G02B6/02328—Hollow or gas filled core
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a kind of tetragonal slower rays photon band-gap optical fiber, it is related to photon band-gap optical fiber field.The optical fiber includes fibre core and covering, and covering is the closed area formed by some tetragonal periodic structures, fibre core for closed area middle absence of heart the defects of region；Each tetragonal periodic structure uses materials A of the refractive index more than 2.24 and refractive index to be made up of 1~1.5 material B, A/B ＞ 2.24；Fibre core is made of material of the refractive index more than or equal to 1；Four vertex of tetragonal periodic structure are provided with circular column, are connected between adjacent annular post by connecting rod, circular column and connecting rod are made of materials A；The outer radius of circular column are 0.2~0.45a, and inner radial is 0~0.27a；The width of connecting rod is less than 0.22a.The present invention can use the fiber optic materials for being easy to draw to make, and be easy to mass produce, and cost is relatively low, be not only convenient for people's use, and the scope of application is than wide.
Description
Technical field
The present invention relates to photon band-gap optical fiber field, and in particular to a kind of tetragonal slower rays photon band-gap optical fiber.
Background technology
Photon band-gap optical fiber includes fibre core and covering：Covering finger ring is wound on the periodic structure outside fibre core, and fibre core refers to optical fiber
Central area, formed by damaging or lacking one or more periodic structures.When photon band-gap optical fiber obtains photon band gap, pass through
Change material composition, the shape and size of fibre cladding periodic structure.When propagation constant is zero, photon band gap light of the invention
Fine covering has a complete band gap, and the fractional transmission pattern in photon band-gap optical fiber has low transmission group velocity, i.e. photonic band
The group index of pbg fiber, being capable of slower rays transmission optical signal higher than the Refractive Index of Material of the medium of composition optical fiber.
Applicant consults existing document and patent finds that existing photon band-gap optical fiber has following defect：
(1) people usually require to be more than 3.4 using refractive index ratio:1 material makes complete photonic band gap, still, leads to
Superrefraction rate ratio is more than 3.4:The process that 1 material makes complete photonic band gap is more complicated, is not easy to people's use.
(2) band gap of the covering of conventional photon band-gap optical fiber is more than at zero propagation constant, therefore does not have slower rays
Effect.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of tetragonal slower rays photon band gap
Optical fiber, the present invention can use the fiber optic materials for being easy to draw to make, be easy to mass produce, cost is relatively low, not only with band
Roomy, loss is small, the features such as slower rays group index scope is big, is easy to people to use, and the scope of application is than wide.
To achieve the above objectives, a kind of tetragonal slower rays photon band-gap optical fiber provided by the invention, including fibre core and bag
Layer, the covering include the closed area formed by some tetragonal periodic structures, and the fibre core is the center of closed area
The defects of missing region；Each tetragonal periodic structure use refractive index be more than 2.24 materials A and refractive index for 1~
1.5 material B is made, and B is filled in A inside, A/B ＞ 2.24；The fibre core is more than or equal to 1 material system using refractive index
Into；
Four vertex of each tetragonal periodic structure are provided with circular column, pass through between adjacent annular post
Connecting rod is connected, and circular column and connecting rod are made of materials A；The outer radius of the circular column are 0.2~0.45a, and a is
The cycle of tetragonal；The inner radial of the circular column is 0~0.27a, when the inner radial of circular column is zero, circular column
For solid circles post, when the inner radial of circular column is non-zero, circular column is hollow circular columns；The width of the connecting rod is small
In 0.22a.
On the basis of above-mentioned technical proposal, the materials A is chalcogenide, and the material B is air, the fibre core
It is made of air.
On the basis of above-mentioned technical proposal, the circular column is solid circles post, and the materials A is adopted as refractive index and is
2.8 chalcogenide；The circular column outer radius are 0.33a, and the width of the connecting rod is 0.1a.
On the basis of above-mentioned technical proposal, the normalization complete photonic band gap width of the covering periodic structure is
7.36%.
On the basis of above-mentioned technical proposal, the circular column is hollow circular columns, and the materials A is adopted as refractive index and is
2.8 chalcogenide；The width D of the connecting rod is 0.05a, the circular column outer radius be Dsqrt (2)+
0.29a, inner radial 0.14a, sqrt represent square root calculating.
On the basis of above-mentioned technical proposal, the normalization complete photonic band gap width of the covering periodic structure is
13.45%.
On the basis of above-mentioned technical proposal, the materials A is glass.
On the basis of above-mentioned technical proposal, the generation type in region is the defects of the fibre core：The closed area of covering
Remove the defects of at least one tetragonal periodic structure produces complete cycle structure region at center.
On the basis of above-mentioned technical proposal, the generation type in region is the defects of the fibre core：The closed area of covering
Change the defects of at least one tetragonal periodic structure produces complete cycle structure region at center.
Compared with prior art, the advantage of the invention is that：
(1) present invention has complete light by the covering that some tetragonal periodic structures are formed when propagation constant is zero
Subband gap, i.e., photon band gap to TE patterns and TM patterns be present simultaneously, this complete band gap simultaneously can be extended to propagation constant and not be
Zero region.
The defects of fibre core of the present invention, region can to produce guided mode in the photon band gap of covering, and the partial mode in guided mode has
Some group indexs can be higher than the Refractive Index of Material of high index materials A in itself.Therefore fibre core has relatively low transmission group velocity
Degree, and then form slower rays transmission.
Therefore, tetragonal slower rays photon band-gap optical fiber of the invention can be realized and led propagation constant is zero-based
Mould, and then realize that slower rays transmits.Compared with the more complicated photon band-gap optical fiber of manufacturing process in the prior art, the present invention can
Being made using the fiber optic materials for being easy to draw, be not only easy to mass produce, cost is relatively low, and with roomy, loss is small,
The features such as slower rays group index scope is big, is easy to people to use.
(2) tetragonal slower rays photon band-gap optical fiber of the invention, which can be used as, makes various slower rays equipment (such as slower rays
Fibre optical sensor, slower rays delay line, slower rays Mach increase Dare interferometer, slower rays modulator, slow light buffer, slower rays synchronizer,
Slower rays dispersion compensation, slower rays attenuator, slower rays nonlinear device etc.) basis, additionally it is possible to it is extensive as a kind of important optical fiber
For fields such as light guide, optic communication, Photoelectric Detection and light sensings, the scope of application is than wide.
Brief description of the drawings
Fig. 1 is the horizontal stroke of tetragonal slower rays photon band-gap optical fiber when circular column is hollow circular columns in the embodiment of the present invention
Schematic cross-section；
Fig. 2 be tetragonal slower rays photon band-gap optical fiber when circular column is hollow circular columns in the embodiment of the present invention just
The structural representation of prismatic crystal lattice；
Fig. 3 is the horizontal stroke of tetragonal slower rays photon band-gap optical fiber when circular column is solid circles post in the embodiment of the present invention
Schematic cross-section；
Fig. 4 is the guided mode dispersion map for the hollow optic fibre for removing 4 solid circles posts in the embodiment of the present invention；
Fig. 5 is the guided mode dispersion map for the hollow optic fibre for removing 1 hollow circular columns in the embodiment of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Referring to shown in Fig. 1 and Fig. 2, the tetragonal slower rays photon band-gap optical fiber in the embodiment of the present invention, including fibre core and
The defects of covering, covering are the closed area that some tetragonal periodic structures are formed, and fibre core is the middle absence of heart of closed area
Region.Each tetragonal periodic structure use refractive index to be more than 2.24 materials A and refractive index for 1~1.5 material B systems
A inside is filled in into, B, and A and B ratio are more than 2.24 (i.e. A/B ＞ 2.24), and fibre core is more than or equal to 1 material using refractive index
Material is made.
Referring to shown in Fig. 1 and Fig. 3, four vertex of each tetragonal periodic structure are provided with circular column, adjacent
Connected between circular column by connecting rod.Circular column and connecting rod are made of materials A, tetragonal periodic structure, fibre core,
The material that circular column and connecting rod are selected make it that the material selection range of drawing optical fiber is wider.The outer radius of circular column are 0.2
~0.45a, a are the cycle of tetragonal；The inner radial of circular column is 0~0.27a (when the inner radial of circular column is zero
When, circular column is solid circles post, and when the inner radial of circular column is non-zero, circular column is hollow circular columns)；Connecting rod
Width is less than 0.22a.
The defects of fibre core in the present embodiment, the generation type in region was：Remove at least 1 at center in the closed area of covering
Individual tetragonal periodic structure produces the defects of complete cycle structure region, or by the closed area of covering change at center to
The defects of few 1 tetragonal periodic structure produces complete cycle structure region.
Materials A in the present embodiment is chalcogenide (glass), and material B is air, and fibre core is made of air.Propagate
When constant is zero, normalization complete photonic band gap width (complete band gap width and the frequency in band gap center of covering periodic structure
Than) be 13.45%, when circular column be solid circles post, normalization complete photonic band gap width is 7.36%, its band gap width compared with
Greatly, the bandwidth of fiber mode is added.
The design principle of the present invention is as follows：
By the covering that some tetragonal periodic structures are formed when propagation constant is zero, there is complete photonic band gap, i.e.,
Photon band gap be present to TE patterns (electric vector is vertical with the direction of propagation) and TM patterns (magnetic vector is vertical with the direction of propagation) simultaneously,
This complete band gap simultaneously can be extended to the region that propagation constant is not zero.
The defects of fibre core, region can to produce guided mode in the photon band gap of covering, the group that the partial mode in guided mode has
Refractive index can be higher than the Refractive Index of Material of high index materials A in itself.Therefore fibre core has relatively low transmission group velocity, and then
Form slower rays transmission.
Describe the tetragonal slower rays photon band-gap optical fiber of the present invention in detail below by 2 embodiments.
Embodiment 1, circular column are solid circles post, i.e., inner radial is 0, and materials A (circular column and connecting rod) is refraction
Rate is 2.8 chalcogenide, and fibre core is made of air, after fibre core removes middle 4 solid circles posts and connecting rod, is formed
Hollow optic fibre.
The parameter of optical fiber is in embodiment 1：Circular column outer radius are 0.33a, and the width of connecting rod is 0.1a, wherein a
For the cycle of tetragonal；A actual value determines according to target frequency, can be converted by the value of normalized frequency.
When propagation constant is zero, the normalization complete band gap width of covering periodic structure is 7.36%.Referring to Fig. 4 institutes
Show, occur among band gap 2 since normalized phase contant is zero slower rays guided mode (be actually 3 slower rays guided modes,
Wherein following 1 is the degenerate mode of two patterns, that is, has 2 coincidences).The dispersion curve of 2 guided modes is in close normalization
It is all very straight when propagation constant is near zero, represent occur zero group velocity pattern when propagation constant is zero, and this is attached
All there is slower rays near region.
Embodiment 2, circular column are hollow circular columns, i.e., inner radial is non-zero, and materials A (circular column and connecting rod) is folding
The chalcogenide that rate is 2.8 is penetrated, fibre core is made of air, after fibre core removes middle 1 hollow circular columns and connecting rod, shape
Into hollow optic fibre.
The parameter of optical fiber is in embodiment 2：The width D of connecting rod is 0.05a；Circular column outer radius are Dsqrt (2)
+ 0.29a, inner radial 0.14a, sqrt represent square root calculating.
When propagation constant is zero, the normalization complete band gap width of covering periodic structure is 13.45%.Referring to Fig. 5 institutes
Show occur two guided mode dispersion curves among band gap, but wherein only have the dispersion curve of a upper guided mode from
Normalized phase contant is zero to start to extend, and pattern dispersion curve near zero propagation constant is more straight, and as slower rays is led
Mould；It is 0.28 or so that the dispersion curve of an other guided mode, which appears in normalized phase contant, and the dispersion curve of the pattern is relative
Steeper always, it is fast optical mode.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (9)
1. a kind of tetragonal slower rays photon band-gap optical fiber, including fibre core and covering, it is characterised in that：If the covering include by
The closed area that dry tetragonal periodic structure is formed, the defects of fibre core is the middle absence of heart of closed area region；Each
Tetragonal periodic structure uses materials A of the refractive index more than 2.24 and refractive index to be made up of 1~1.5 material B, B fillings
In A inside, A/B ＞ 2.24；The fibre core is made of material of the refractive index more than or equal to 1；
Four vertex of each tetragonal periodic structure are provided with circular column, pass through connection between adjacent annular post
Bar is connected, and circular column and connecting rod are made of materials A；The outer radius of the circular column are 0.2~0.45a, and a is pros
The cycle of lattice；The inner radial of the circular column is 0~0.27a, and when the inner radial of circular column is zero, circular column is real
Heart circular columns, when the inner radial of circular column is non-zero, circular column is hollow circular columns；The width of the connecting rod is less than
0.22a。
2. tetragonal slower rays photon band-gap optical fiber as claimed in claim 1, it is characterised in that：The materials A is chalcogenide
Compound, the material B are air, and the fibre core is made of air.
3. tetragonal slower rays photon band-gap optical fiber as claimed in claim 2, it is characterised in that：The circular column is filled circles
Shape post, the materials A are adopted as the chalcogenide that refractive index is 2.8；The circular column outer radius are 0.33a, the company
The width of extension bar is 0.1a.
4. tetragonal slower rays photon band-gap optical fiber as claimed in claim 3, it is characterised in that：The covering periodic structure
It is 7.36% to normalize complete photonic band gap width.
5. tetragonal slower rays photon band-gap optical fiber as claimed in claim 2, it is characterised in that：The circular column is open circles
Shape post, the materials A are adopted as the chalcogenide that refractive index is 2.8；The width D of the connecting rod is 0.05a, the annular
Post outer radius are Dsqrt (2)+0.29a, and inner radial 0.14a, sqrt represent square root calculating.
6. tetragonal slower rays photon band-gap optical fiber as claimed in claim 5, it is characterised in that：The covering periodic structure
It is 13.45% to normalize complete photonic band gap width.
7. the tetragonal slower rays photon band-gap optical fiber as described in any one of claim 2 to 6, it is characterised in that：The materials A
For glass.
8. the tetragonal slower rays photon band-gap optical fiber as described in any one of claim 1 to 6, it is characterised in that：The fibre core
The defects of region generation type be：Remove at least one tetragonal periodic structure at center and produced in the closed area of covering
The defects of structure complete cycle region.
9. the tetragonal slower rays photon band-gap optical fiber as described in any one of claim 1 to 6, it is characterised in that：The fibre core
The defects of region generation type be：The closed area of covering changes at least one tetragonal periodic structure at center and produced
The defects of structure complete cycle region.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510011258.6A CN104503019B (en) | 2015-01-09 | 2015-01-09 | Tetragonal slower rays photon band-gap optical fiber |
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| CN201510011258.6A CN104503019B (en) | 2015-01-09 | 2015-01-09 | Tetragonal slower rays photon band-gap optical fiber |
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| CN104503019A CN104503019A (en) | 2015-04-08 |
| CN104503019B true CN104503019B (en) | 2017-12-12 |
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| CN109031517B (en) * | 2018-10-25 | 2023-06-02 | 江西师范大学 | Rectangular hollow optical fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6334017B1 (en) * | 1999-10-26 | 2001-12-25 | Corning Inc | Ring photonic crystal fibers |
| US8705898B2 (en) * | 2007-06-15 | 2014-04-22 | The Trustees Of Columbia University In The City Of New York | Systems, devices and methods for tuning a resonant wavelength of an optical resonator and dispersion properties of a photonic crystal waveguide |
| CN201368927Y (en) * | 2009-01-14 | 2009-12-23 | 张亚妮 | High-polarization maintaining polymer photonic crystal fiber |
| US8923661B2 (en) * | 2011-07-27 | 2014-12-30 | Massachusetts Institute Of Technology | 2-pattern compound photonic crystals with a large, complete photonic band gap |
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Granted publication date: 20171212 Termination date: 20210109 |