CN104503019A - Square lattice slow light photonic band gap optical fiber - Google Patents
Square lattice slow light photonic band gap optical fiber Download PDFInfo
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- CN104503019A CN104503019A CN201510011258.6A CN201510011258A CN104503019A CN 104503019 A CN104503019 A CN 104503019A CN 201510011258 A CN201510011258 A CN 201510011258A CN 104503019 A CN104503019 A CN 104503019A
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- tetragonal
- optical fiber
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- 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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- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a square lattice slow light photonic band gap optical fiber and relates to the field of photonic band gap optical fibers. The optical fiber comprises a fiber core and a wrapping layer. The wrapping layer is an enclosed area formed by a plurality of square lattice periodic structures. The fire core is a defect area missed from the center of the enclosed area. Each square lattice periodic structure is made of a material A with the refraction rate larger than 2.24 and a material B with the refraction rate of 1-1.5, and A/B>2.24. The fire core is made of a material with the refraction rate larger than 1. Annular columns are arranged at the positions of four corners of the square lattice periodic structure, the adjacent annular columns are connected through a connection rod, and the annular columns and the connection rods are both made of the material A. The outer portion radius of the annular columns is 0.2-0.45a, and the inner portion radius is 0-0.27a. The width of the connection rods is smaller than 0.22a. The optical fiber is made of the material easy to pull, is easy to produce in a large scale, low in cost, convenient to use and wide in application.
Description
Technical field
The present invention relates to photon band-gap optical fiber field, be specifically related to a kind of tetragonal slower rays photon band-gap optical fiber.
Background technology
Photon band-gap optical fiber comprises fibre core and covering: covering finger ring is around the periodic structure of fibre core outside, and fibre core refers to the central area of optical fiber, forms by damaging or lack one or more periodic structure.When photon band-gap optical fiber obtains photon band gap, by changing material composition, the shape and size of fibre cladding periodic structure.When propagation constant is zero, the covering of photon band-gap optical fiber of the present invention has complete band gap, fractional transmission pattern in photon band-gap optical fiber has low transmission group speed, and namely the group index of photon band-gap optical fiber is higher than the Refractive Index of Material of medium of composition optical fiber, can slower rays transmitting optical signal.
Applicant consults existing document and patent finds that existing photon band-gap optical fiber exists following defect:
(1) people need to adopt refractive index ratio to be greater than the material of 3.4:1 to make complete photonic band gap usually, but, be greater than the process more complicated of the material making complete photonic band gap of 3.4:1 by refractive index ratio, be not easy to people and use.
(2) band gap of the covering of conventional photon band-gap optical fiber appears at propagation constant and is greater than zero place, so there is no slow light effect.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of tetragonal slower rays photon band-gap optical fiber, the present invention can adopt the fiber optic materials being easy to draw to make, be easy to large-scale production, cost is lower, not only has band roomy, loss is little, the features such as slower rays group index scope is large, are convenient to people and use, and the scope of application are more extensive.
For reaching above object, a kind of tetragonal slower rays photon band-gap optical fiber provided by the invention, comprise fibre core and covering, described covering comprises the closed region formed by some tetragonal periodic structures, and described fibre core is the defect area of the middle absence of heart of closed region; Each tetragonal periodic structure all adopt refractive index be greater than 2.24 materials A and refractive index be 1 ~ 1.5 material B make, B is filled in the inside of A, A/B > 2.24; The material that described fibre core adopts refractive index to be more than or equal to 1 is made;
Four drift angle places of described each tetragonal periodic structure are provided with circular column, are connected between adjacent annular post by connecting link, and circular column and connecting link all adopt materials A to make; The cycle of the outer radius of described circular column to be 0.2 ~ 0.45a, a be tetragonal; The inner radial of described circular column is 0 ~ 0.27a, and when the inner radial of circular column is zero, circular column is solid circles post, and when the inner radial of circular column is non-zero, circular column is hollow circular columns; The width of described connecting link is less than 0.22a.
On the basis of technique scheme, described materials A is chalcogenide, and described material B is air, and described fibre core adopts air to make.
On the basis of technique scheme, described circular column is solid circles post, and described materials A is adopted as the chalcogenide that refractive index is 2.8; Described circular column outer radius is 0.33a, and the width of described connecting link is 0.1a.
On the basis of technique scheme, the normalization complete photonic band gap width of described covering periodic structure is 7.36%.
On the basis of technique scheme, described circular column is hollow circular columns, and described materials A is adopted as the chalcogenide that refractive index is 2.8; The width D of described connecting link is 0.05a, and described circular column outer radius is Dsqrt (2)+0.29a, and inner radial is that 0.14a, sqrt represent square root calculating.
On the basis of technique scheme, the normalization complete photonic band gap width of described covering periodic structure is 13.45%.
On the basis of technique scheme, described materials A is glass.
On the basis of technique scheme, the generation type of the defect area of described fibre core is: the defect area that at least 1 tetragonal periodic structure produces complete cycle structure is removed in the closed region of covering at center.
On the basis of technique scheme, the generation type of the defect area of described fibre core is: the closed region of covering changes the defect area that at least 1 tetragonal periodic structure produces complete cycle structure at center.
Compared with prior art, the invention has the advantages that:
(1) covering that is made up of some tetragonal periodic structures of the present invention is when propagation constant is zero, there is complete photonic band gap, namely there is photon band gap to TE pattern and TM pattern, this complete band gap also can be extended to the non-vanishing region of propagation constant simultaneously.
The defect area of fibre core of the present invention can make to produce guided mode in the photon band gap of covering, and the group index that the partial mode in guided mode has can higher than the Refractive Index of Material of high index materials A itself.Therefore fibre core has lower transmission group speed, and then forms slower rays transmission.
Therefore, tetragonal slower rays photon band-gap optical fiber of the present invention can realize at the zero-based guided mode of propagation constant, and then realizes slower rays transmission.Compared with the photon band-gap optical fiber of manufacturing process more complicated in prior art, the present invention can adopt the fiber optic materials being easy to draw to make, and is not only easy to large-scale production, cost is lower, and it is roomy to have band, and loss is little, the features such as slower rays group index scope is large, are convenient to people and use.
(2) tetragonal slower rays photon band-gap optical fiber of the present invention can as the basis making various slower rays equipment (such as slower rays Fibre Optical Sensor, slower rays lag 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.), can also be widely used in the fields such as light guide, optical communication, Photoelectric Detection and light sensing as a kind of important optical fiber, the scope of application is more extensive.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of tetragonal slower rays photon band-gap optical fiber when circular column is hollow circular columns in the embodiment of the present invention;
Fig. 2 is the structural representation of the tetragonal of tetragonal slower rays photon band-gap optical fiber when circular column is hollow circular columns in the embodiment of the present invention;
Fig. 3 is the cross sectional representation of tetragonal slower rays photon band-gap optical fiber when circular column is solid circles post in the embodiment of the present invention;
Fig. 4 is the guided mode dispersion map of the hollow optic fibre removing 4 solid circles posts in the embodiment of the present invention;
Fig. 5 is the guided mode dispersion map of the hollow optic fibre removing 1 hollow circular columns in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Shown in Fig. 1 and Fig. 2, the tetragonal slower rays photon band-gap optical fiber in the embodiment of the present invention, comprises fibre core and covering, and covering is the closed region that some tetragonal periodic structures are formed, and fibre core is the defect area of the middle absence of heart of closed region.Each tetragonal periodic structure all adopt refractive index be greater than 2.24 materials A and refractive index be 1 ~ 1.5 material B make, B is filled in the inside of A, the ratio of A and B is greater than 2.24 (i.e. A/B > 2.24), and the material that fibre core adopts refractive index to be more than or equal to 1 is made.
Shown in Fig. 1 and Fig. 3, four drift angle places of each tetragonal periodic structure are provided with circular column, are connected between adjacent annular post by connecting link.Circular column and connecting link all adopt materials A to make, and the material that tetragonal periodic structure, fibre core, circular column and connecting link are selected makes the material selection range of drawing optical fiber wider.The cycle of the outer radius of circular column to be 0.2 ~ 0.45a, a be tetragonal; The inner radial of circular column is 0 ~ 0.27a (when the inner radial of circular column is zero, circular column is solid circles post, and when the inner radial of circular column is non-zero, circular column is hollow circular columns); The width of connecting link is less than 0.22a.
The generation type of the defect area of the fibre core in the present embodiment is: the defect area that at least 1 tetragonal periodic structure produces complete cycle structure is removed in the closed region of covering at center, or changes at center the defect area that at least 1 tetragonal periodic structure produces complete cycle structure by the closed region of covering.
Materials A in the present embodiment is chalcogenide (glass), and material B is air, and fibre core adopts air to make.When propagation constant is zero, the normalization complete photonic band gap width (complete band gap width compares with the frequency of band gap central authorities) of covering periodic structure is 13.45%, when circular column is solid circles post, normalization complete photonic band gap width is 7.36%, its band gap width is comparatively large, adds the bandwidth of fiber mode.
Design concept of the present invention is as follows:
The covering be made up of some tetragonal periodic structures is when propagation constant is zero, there is complete photonic band gap, namely there is photon band gap to TE pattern (electric vector is vertical with the direction of propagation) with TM pattern (magnetic vector is vertical with the direction of propagation), this complete band gap also can be extended to the non-vanishing region of propagation constant simultaneously.
The defect area of fibre core can make to produce guided mode in the photon band gap of covering, and the group index that the partial mode in guided mode has can higher than the Refractive Index of Material of high index materials A itself.Therefore fibre core has lower transmission group speed, and then forms slower rays transmission.
Tetragonal slower rays photon band-gap optical fiber of the present invention is described in detail below by 2 embodiments.
Embodiment 1, circular column are solid circles post, namely inner radial is 0, materials A (circular column and connecting link) for refractive index be the chalcogenide of 2.8, fibre core adopt air make, fibre core forms hollow optic fibre after removing middle 4 solid circles posts and connecting link.
In embodiment 1, the parameter of optical fiber is: circular column outer radius is 0.33a, and the width of connecting link is 0.1a, and wherein a is the cycle of tetragonal; The actual value of a is determined according to target frequency, can be transformed by the value of normalized frequency.
When propagation constant is zero, the normalization complete band gap width of covering periodic structure is 7.36%.Shown in Figure 4, occur that 2 is slower rays guided mode zero (be actually 3 slower rays guided modes, 1 is wherein the degenerate mode of two patterns, namely has 2 to overlap) from normalized phase contant in the middle of the band gap.Article 2, the dispersion curve of guided mode is all very straight when being near zero close to normalized phase contant, represents to have occurred zero group velocity pattern when propagation constant is zero, and slower rays has all appearred in the region near this.
Embodiment 2, circular column are hollow circular columns, namely inner radial is non-zero, materials A (circular column and connecting link) for refractive index be the chalcogenide of 2.8, fibre core adopt air make, fibre core forms hollow optic fibre after removing middle 1 hollow circular columns and connecting link.
In embodiment 2, the parameter of optical fiber is: the width D of connecting link is 0.05a; Circular column outer radius is Dsqrt (2)+0.29a, and inner radial is that 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%.Shown in Figure 5, two guided mode dispersion curves have been there are in the middle of band gap, but wherein only have the dispersion curve of a guided mode to be comparatively extend zero from normalized phase contant, this pattern dispersion curve near zero propagation constant is more straight, is slower rays guided mode; It is about 0.28 that the dispersion curve of an other guided mode appears at normalized phase contant, and the dispersion curve steeper relatively always of this pattern is fast optical mode.
The present invention is not limited to above-mentioned embodiment, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
Claims (9)
1. a tetragonal slower rays photon band-gap optical fiber, comprises fibre core and covering, it is characterized in that: described covering comprises the closed region formed by some tetragonal periodic structures, and described fibre core is the defect area of the middle absence of heart of closed region; Each tetragonal periodic structure all adopt refractive index be greater than 2.24 materials A and refractive index be 1 ~ 1.5 material B make, B is filled in the inside of A, A/B > 2.24; The material that described fibre core adopts refractive index to be more than or equal to 1 is made;
Four drift angle places of described each tetragonal periodic structure are provided with circular column, are connected between adjacent annular post by connecting link, and circular column and connecting link all adopt materials A to make; The cycle of the outer radius of described circular column to be 0.2 ~ 0.45a, a be tetragonal; The inner radial of described circular column is 0 ~ 0.27a, and when the inner radial of circular column is zero, circular column is solid circles post, and when the inner radial of circular column is non-zero, circular column is hollow circular columns; The width of described connecting link is less than 0.22a.
2. tetragonal slower rays photon band-gap optical fiber as claimed in claim 1, it is characterized in that: described materials A is chalcogenide, described material B is air, and described fibre core adopts air to make.
3. tetragonal slower rays photon band-gap optical fiber as claimed in claim 2, it is characterized in that: described circular column is solid circles post, described materials A is adopted as the chalcogenide that refractive index is 2.8; Described circular column outer radius is 0.33a, and the width of described connecting link is 0.1a.
4. tetragonal slower rays photon band-gap optical fiber as claimed in claim 3, is characterized in that: the normalization complete photonic band gap width of described covering periodic structure is 7.36%.
5. tetragonal slower rays photon band-gap optical fiber as claimed in claim 2, it is characterized in that: described circular column is hollow circular columns, described materials A is adopted as the chalcogenide that refractive index is 2.8; The width D of described connecting link is 0.05a, and described circular column outer radius is Dsqrt (2)+0.29a, and inner radial is that 0.14a, sqrt represent square root calculating.
6. tetragonal slower rays photon band-gap optical fiber as claimed in claim 5, is characterized in that: the normalization complete photonic band gap width of described covering periodic structure is 13.45%.
7. the tetragonal slower rays photon band-gap optical fiber as described in any one of claim 2 to 6, is characterized in that: described materials A is glass.
8. the tetragonal slower rays photon band-gap optical fiber as described in any one of claim 1 to 6, is characterized in that: the generation type of the defect area of described fibre core is: the defect area that at least 1 tetragonal periodic structure produces complete cycle structure is removed in the closed region of covering at center.
9. the tetragonal slower rays photon band-gap optical fiber as described in any one of claim 1 to 6, is characterized in that: the generation type of the defect area of described fibre core is: the closed region of covering changes the defect area that at least 1 tetragonal periodic structure produces complete cycle structure at center.
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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 true CN104503019A (en) | 2015-04-08 |
| CN104503019B CN104503019B (en) | 2017-12-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031517A (en) * | 2018-10-25 | 2018-12-18 | 江西师范大学 | A kind of rectangle hollow optical fiber |
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| CN1382265A (en) * | 1999-10-26 | 2002-11-27 | 康宁股份有限公司 | Ring photoni crystal fibers |
| WO2008157484A1 (en) * | 2007-06-15 | 2008-12-24 | 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031517A (en) * | 2018-10-25 | 2018-12-18 | 江西师范大学 | A kind of rectangle hollow optical fiber |
| CN109031517B (en) * | 2018-10-25 | 2023-06-02 | 江西师范大学 | Rectangular hollow optical fiber |
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| CN104503019B (en) | 2017-12-12 |
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