CN209311732U - 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
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- CN209311732U CN209311732U CN201920058407.8U CN201920058407U CN209311732U CN 209311732 U CN209311732 U CN 209311732U CN 201920058407 U CN201920058407 U CN 201920058407U CN 209311732 U CN209311732 U CN 209311732U
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- photonic crystal
- polarization maintaining
- maintaining optical
- crystal polarization
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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.
Utility model content
Technical problem to be solved by the utility model is: to solve above-mentioned deficiency in the prior art, to provide one kind
Gradual change type photonic crystal polarization maintaining optical fibre with multicore structure.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
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, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, the quantity of shown fibre core are 6；6 fibre cores
Diameter be in arithmetic progression, tolerance be 0.18-0.3 μm.
Preferably, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, tolerance are 0.3 μm.
Preferably, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, the covering is double-layer 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, and each edge of hexagon has 3
Round hole.
Preferably, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, the effective refractive index of base material are
1.455-1.47。
Preferably, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, the effective refractive index of base material are
1.4622。
Preferably, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, the effective refractive index range of fibre core are 1.4-
1.46。
Preferably, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, the effective refractive index range of fibre core are
1.4568。
Preferably, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, the diameter of each round hole in the covering
For d, the distance in two adjacent circular holes is Λ, and the value of d/ Λ is 0.9-0.98.
Preferably, the gradual change type photonic crystal polarization maintaining optical fibre of the utility model, the optical fiber are single-mode transmission optical fiber.
The beneficial effects of the utility model 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 the utility model gradual change type photonic crystal polarization maintaining optical fibre；
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 that the utility model is created, remove
Non- to be otherwise noted, 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 |
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| CN2018215445478 | 2018-09-20 | ||
| CN201821544547 | 2018-09-20 |
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| CN209311732U true CN209311732U (en) | 2019-08-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696724A (en) * | 2018-09-20 | 2019-04-30 | 通鼎互联信息股份有限公司 | A kind of gradual change type photonic crystal polarization maintaining optical fibre |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696724A (en) * | 2018-09-20 | 2019-04-30 | 通鼎互联信息股份有限公司 | A kind of gradual change type photonic crystal polarization maintaining optical fibre |
| CN109696724B (en) * | 2018-09-20 | 2024-03-12 | 通鼎互联信息股份有限公司 | Gradual change type photonic crystal polarization maintaining fiber |
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