CN109696724A - A kind of gradual change type photonic crystal polarization maintaining optical fibre - Google Patents
A kind of gradual change type photonic crystal polarization maintaining optical fibre Download PDFInfo
- Publication number
- CN109696724A CN109696724A CN201910030981.7A CN201910030981A CN109696724A CN 109696724 A CN109696724 A CN 109696724A CN 201910030981 A CN201910030981 A CN 201910030981A CN 109696724 A CN109696724 A CN 109696724A
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- China
- Prior art keywords
- photonic crystal
- polarization maintaining
- maintaining optical
- crystal polarization
- gradual change
- 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.)
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 58
- 230000010287 polarization Effects 0.000 title claims abstract description 43
- 239000004038 photonic crystal Substances 0.000 title claims abstract description 39
- 239000000835 fiber Substances 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Classifications
-
- 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
- G02B6/024—Optical fibres with cladding with or without a coating with polarisation maintaining properties
-
- 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
- G02B6/02042—Multicore optical fibres
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
This application involves a kind of photonic crystal polarization maintaining optical fibres, comprising: base material, the fibre core positioned at base material center on base material and surround the covering of the fibre core；The fibre core is multicore structure, and the diameter of 4-7 fibre core with being sequentially increased counterclockwise or clockwise, and multiple fibre cores are arranged in regular polygon, and the center of circle of each fibre core is located at the apex of polygon；The covering is arranged in several round holes in polygonal array of base material, the hexagonal arrangement of round hole.Multicore structure is set in photonic crystal polarization maintaining optical fibre, fibre core is multicore structure, the diameter of 4-7 fibre core is sequentially increased with counterclockwise or clockwise direction, break the circular symmetry of optical fiber, polarization-maintaining performance is realized by 4-7 fibre core, optical fiber introduces the different fibre core of multiple sizes, can transmit more optical signals than single-core fiber, improve transmission capacity.
Description
Technical field
The application belongs to photonic crystal polarization maintaining optical fibre field, and in particular to a kind of gradual change type photonic crystal polarization maintaining optical fibre.
Background technique
Be otherwise known as porous optical fiber or microstructured optical fibers of photonic crystal polarization maintaining optical fibre can be classified as according to guide-lighting principle
Full-internal reflection type photonic crystal polarization maintaining optical fibre and band gap type photonic crystal polarization maintaining optical fibre.Due to the flexibility of design, can pass through
Adjustment structure and parameter greatly improves the performance of optical fiber, makes up traditional fiber well to change the transmission characteristic of optical fiber
The deficiency of technology.With the development of technology of preparing, weight is all achieved in various fields such as optical-fibre communications, sensing, couplers at present
Big progress.
Ideal optical fiber has good circular symmetry, can transmit two orthogonal polarization modes, can carry out letter
And.The original symmetry for destroying photonic crystal polarization maintaining optical fibre structure in practice, usually there is following four kinds of methods: 1, applying to optical fiber
Stress；2, the shape and size for changing some airports, can introduce the airports such as ellipse, diamond shape；3, it decreases or increases
Airport；4, change airport pitch of holes on two polarization directions, such as introduce rectangular lattice lattice arrangement.By reasonable
Structure design, not only may be implemented polarization property, can also realize the guide-lighting effect of single polarization.Even if optical fiber deformation occurs or
Bending, the polarization state of light beam can also be transmitted well.
With the raising that people require optical fiber transmission capacity, sight is turned to multicore photonic crystal polarization-maintaining light by researcher
Fibre, compared to single-core fiber, multi-core optical fiber has biggish mode field area, and wavelength is in 1200-1600nm, on x-polarisation direction
Mode field area range be 150-300 μm2, can be used for making high-power laser, and can effectively reduce optical fiber
Nonlinear effect, and have in fields such as photoswitch, wavelength division multiplexers and widely apply.
Summary of the invention
The technical problem to be solved by the present invention is to solve above-mentioned deficiency in the prior art, so that providing one kind has
The gradual change type photonic crystal polarization maintaining optical fibre of multicore structure.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of gradual change type photonic crystal polarization maintaining optical fibre, comprising:
Base material, the fibre core positioned at base material center on base material and surround the fibre core
Covering；
The fibre core is multicore structure, and the diameter of 4-7 fibre core is more with counterclockwise or clockwise direction is sequentially increased
A fibre core is arranged in regular polygon, and the center of circle of each fibre core is located at the apex of polygon；
The covering is arranged in several round holes in polygonal array of base material, the hexagonal row of round hole
Cloth.
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, the quantity of shown fibre core are 6；6 fibre cores it is straight
Diameter is in arithmetic progression, and tolerance is 0.18-0.3 μm.
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, tolerance are 0.3 μm.
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, the covering are double-layer structure, and wherein first layer is
6 round holes, each round hole are located at the apex of hexagon, and the second layer is 12, and each edge of hexagon has 3 circles
Hole.
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, the effective refractive index of base material are 1.455-
1.47。
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, the effective refractive index of base material are 1.4622.
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, the effective refractive index range of fibre core are 1.4-1.46.
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, the effective refractive index range of fibre core are 1.4568.
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, the diameter of each round hole is d in the covering,
The distance in two adjacent circular holes is Λ, and the value of d/ Λ is 0.9-0.98.
Preferably, gradual change type photonic crystal polarization maintaining optical fibre of the invention, the optical fiber are single-mode transmission optical fiber.
The beneficial effects of the present invention are:
(1) multicore structure is set in the application photonic crystal polarization maintaining optical fibre, fibre core is multicore structure, 4-7 fibre core it is straight
Diameter breaks the circular symmetry of optical fiber, realizes polarization-maintaining by 4-7 fibre core with being sequentially increased counterclockwise or clockwise
Can, optical fiber introduces the different fibre core of multiple sizes, can transmit more optical signals than single-core fiber, improve transmission capacity.
(2) the gradual change type photonic crystal polarization maintaining optical fibre of the application, when fibre core is 6, the diameter of 6 fibre cores is in wait differences
Column, tolerance also have the advantages that big mode field area when being 0.18-0.3 μm, can have a wide range of applications in communication band.
Detailed description of the invention
The technical solution of the application is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the cross-sectional structure schematic diagram of gradual change type photonic crystal polarization maintaining optical fibre of the present invention；
Fig. 2 is tolerance when being 0.3 μm, 0.25 μm and 0.18 μm, the birefringent relation curve with wavelength；
Fig. 3 is tolerance when being 0.3 μm, the relation curve of x-polarisation and y-polarisation direction mode field area and wavelength.
Two dotted line regular hexagons in Fig. 1 are not the structure of gradual change type photonic crystal polarization maintaining optical fibre, but in order to illustrate
The arrangement mode of round hole or multicore structure.
Appended drawing reference in figure are as follows:
Base material 1, covering 2, fibre core 3.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
In the description of the present application, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the application and simplifies description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
The limitation of the application protection scope.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.In the description of the invention, unless separately
It is described, the meaning of " plurality " is two or more.
In the description of the present application, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in this application.
It is described in detail the technical solution of the application below with reference to the accompanying drawings and in conjunction with the embodiments.
Embodiment
The present embodiment provides a kind of gradual change type photonic crystal polarization maintaining optical fibre, cross section is as shown in Figure 1, comprising:
The cross section of high refractive index is circular base material 1, and the fibre core 3 positioned at 1 center of base material is located at base
On bottom material 1 and surround the covering 2 of the fibre core 3；
The fibre core 3 is multicore structure, the diameters of multiple fibre cores 3 with being sequentially increased counterclockwise or clockwise,
Multiple fibre cores 3 are arranged in regular polygon, and the center of circle of each fibre core 3 is located at the apex of polygon, and wherein the quantity of fibre core 3 can be with
It is 4,5,6 or 7, wherein effect is best at 6；
The diameter of 6 fibre cores 3 is in arithmetic progression, and tolerance is 0.18-0.3 μm, as shown in Fig. 2, Fig. 2 is respectively for tolerance
0.3 μm, 0.25 μm and 0.18 μm；At 0.3 μm, the value of birefringence, birefringent maximum is more than 4.2 × 10-5, realize polarization-maintaining effect
It is best.
The covering 2 is arranged in several round holes in polygonal array of base material 1, and has double-layer structure,
The hexagonal arrangement of round hole, first layer are 6 round holes, and each round hole is located at the apex of hexagon, the second layer 12
A, each edge of hexagon has 3 round holes, and 2 layers of covering 2 can reduce the loss of optical fiber, while guarantee preparation process not
It is excessively complicated；Covering is the regular hexagon being made of the identical round hole of size, in the transmission of research photonic crystal polarization maintaining optical fibre
When performance, regular hexagon is more typical structure, meets round symmetry；
The diameter of each round hole is d in the covering 2, and the distance in two adjacent circular holes is Λ, and the value of d/ Λ is
0.9-0.98, covering duty ratio meet the guide-lighting principle of optical fiber total reflection close to 1, reduce the energy for leaking into covering, reduce
Loss；
Base material 1 is that silica mixes germanium or other elements, effective refractive index 1.455-1.47, and preferred value is
1.4622；
Fibre core 3 is silica-doped fluorine or other elements, and effective refractive index range is 1.4-1.46, preferably
1.4568；
There are 6 fibre cores 3, the effective refractive index of base material 1 is 1.4622, fine in gradual change type photonic crystal polarization maintaining optical fibre
When the effective refractive index of core 3 is 1.4568, experiment effect is as shown in Figures 2 and 3, and Fig. 2 is that transmission wavelength range is 1200-
When the light of 1600nm, the birefringent change curve with wavelength, by curve it can be seen that birefringent can reach 10-5Rank.
Fig. 3 is the mode field area of x-polarisation and y-polarisation direction and the relation curve of wavelength, effective mould field on y-polarisation direction
The direction area ratio x wants small, when medium wavelength is 1550nm, by curve it can be seen that effective mould field face on x-polarisation direction
Product maximum value is more than 272 μm2。
It is enlightenment with the above-mentioned desirable embodiment according to the application, through the above description, relevant staff is complete
Full various changes and amendments can be carried out in the range of without departing from this item application technical idea.The technology of this item application
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of gradual change type photonic crystal polarization maintaining optical fibre characterized by comprising
Base material (1) is located at the fibre core (3) of base material (1) center, is located on base material (1) and surrounds residence
State the covering (2) of fibre core (3)；
The fibre core (3) is multicore structure, the diameter of 4-7 fibre core (3) with counterclockwise or clockwise direction is sequentially increased,
Multiple fibre cores (3) are arranged in regular polygon, and the center of circle of each fibre core (3) is located at the apex of polygon；
The covering (2) is arranged in several round holes in polygonal array of base material (1), the hexagonal row of round hole
Cloth.
2. gradual change type photonic crystal polarization maintaining optical fibre according to claim 1, which is characterized in that the quantity of shown fibre core (3)
It is 6；The diameter of 6 fibre cores (3) is in arithmetic progression, and tolerance is 0.18-0.3 μm.
3. gradual change type photonic crystal polarization maintaining optical fibre according to claim 2, which is characterized in that tolerance is 0.3 μm.
4. gradual change type photonic crystal polarization maintaining optical fibre according to claim 1, which is characterized in that the covering (2) is bilayer
Structure, wherein first layer is 6 round holes, and each round hole is located at the apex of hexagon, and the second layer is 12, hexagon
Each edge has 3 round holes.
5. gradual change type photonic crystal polarization maintaining optical fibre according to claim 1, which is characterized in that base material (1) it is effective
Refractive index is 1.455-1.47.
6. gradual change type photonic crystal polarization maintaining optical fibre according to claim 5, which is characterized in that base material (1) it is effective
Refractive index is 1.4622.
7. gradual change type photonic crystal polarization maintaining optical fibre according to claim 1, which is characterized in that effective refraction of fibre core (3)
Rate range is 1.4-1.46.
8. gradual change type photonic crystal polarization maintaining optical fibre according to claim 7, which is characterized in that effective refraction of fibre core (3)
Rate range is 1.4568.
9. gradual change type photonic crystal polarization maintaining optical fibre according to claim 1-8, which is characterized in that the covering
(2) diameter of each round hole is d in, and the distance in two adjacent circular holes is Λ, and the value of d/ Λ is 0.9-0.98.
10. gradual change type photonic crystal polarization maintaining optical fibre according to claim 1-8, which is characterized in that the optical fiber
For single-mode transmission optical fiber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018111002329 | 2018-09-20 | ||
| CN201811100232 | 2018-09-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109696724A true CN109696724A (en) | 2019-04-30 |
| CN109696724B CN109696724B (en) | 2024-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910030981.7A Active CN109696724B (en) | 2018-09-20 | 2019-01-14 | Gradual change type photonic crystal polarization maintaining fiber |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109696724B (en) |
| WO (1) | WO2020056821A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110261956A (en) * | 2019-06-20 | 2019-09-20 | 长飞光纤光缆股份有限公司 | A kind of array type polarization-maintaining multi-core optical fiber |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020056821A1 (en) | 2020-03-26 |
| CN109696724B (en) | 2024-03-12 |
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