CN1186655C - Hollow optical-fiber - Google Patents
Hollow optical-fiber Download PDFInfo
- Publication number
- CN1186655C CN1186655C CNB021476772A CN02147677A CN1186655C CN 1186655 C CN1186655 C CN 1186655C CN B021476772 A CNB021476772 A CN B021476772A CN 02147677 A CN02147677 A CN 02147677A CN 1186655 C CN1186655 C CN 1186655C
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- hollow
- light
- cladding structure
- core
- district
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Abstract
The present invention relates to a hollow optical fiber which belongs to the field of photoelectron materials, which is optical waveguide capable of transmitting visible light and near infrared light and is also a particle guiding tube. The hollow optical fiber of the present invention is characterized in that a pair of or a plurality of pairs (chamfering) prisms in the shape of an approximate right angle or lamellar structures of the prisms, or close-packed or loose-arranged cyclic or non-cyclic lamellar structures formed by equant columns. Light is mainly transmitted along longitudinal direction, the light is reflected to a hollow area by twice or several times (approximate) total reflection in a cladding structure, and thus, the radiation of light beam is limited to form a guiding film. The optical fiber has the advantages of small nonlinear effect, small wastage and large wavelength range of single mode operation, can transmit an ultrashort pulse, or can manufacture other optoelectronic devices.
Description
One, technical field
Hollow-core fiber belongs to the photoelectron material field, is the waveguide of transmission visible light and near infrared range, also can make the particle conduit.
Two, technical background
The advantage of hollow-core fiber is to be the main transmission medium of light with air or other gas, liquid, its material dispersion is little, absorbs little, non-linear little, be near desirable optical waveguide, can be used for transmitting light and be used to make various optoelectronic devices, gas-liquid sensor and atom conduit etc.Existing hollow-core fiber has three classes: the first kind is the hollow-core fiber of making of glass.It can not form guided mode in the hollow district, and loss is very big.Second class is to be coated with the replica hollow-core fiber.Coat reflectance coating in optical fiber periphery or internal layer, this reflectance coating is made up of metal (as silver) or other materials (as germanium dioxide) etc.Its shortcoming is: reflectance coating is very big at visible light and near-infrared region absorption, causes fibre loss very big.The 3rd class is photonic crystal fiber (photon band-gap optical fiber) or porous optical fiber.Its periphery, hollow district is a porous circular cylinder type medium, and it is repeatedly to reflect on porous and reflect (Bragg reflection) by light, and confine optical beam extends to outside the optical fiber.It has problem to be solved is that loss is big, and hollow district area is little.
Three, summary of the invention
The object of the present invention is to provide the hollow-core fiber that a kind of energy confine optical beam spreads, loss is little, it can lean on twice or repeatedly (be similar to) total internal reflection (as approximate right angle prism or cylindrical lens) constraint beam spread, makes light beam return the hollow district.
A kind of hollow-core fiber provided by the invention; it is made of hollow district, cladding structure and protective casing; it is characterized in that on the xsect of this optical fiber; cladding structure contains the right-angle triangle small structure of a plurality of square arrangement, the adjacent straight arm of angle of its two adjacent holes, the right-angle prism of formation rescinded angle; lateral light is from core district directive cladding structure; after in cladding structure, forming twice total internal reflection, penetrate go back to the core district again, form guided mode.
Another kind of hollow-core fiber provided by the invention; it is made of hollow district, cladding structure and protective casing; it is characterized in that on the xsect of this optical fiber; cladding structure is to be made of the space outside the right-angle prism quadrilateral of high-index material and the prism; lateral light is from core district directive cladding structure; after in cladding structure, forming twice total internal reflection, penetrate go back to the core district again, form guided mode.
Described cladding structure also can be close-packed structure or the loose arrangement architecture that isometrical cylindrical dielectric is lined up.
In a word, described cladding structure is the lateral light that the core district is come, and through secondary or repeatedly total reflection, returns the structure in core district again.
The cross sectional shape in described core district is square, rectangle, polygon or circle, and the cross sectional shape of described cladding structure is square, circle or polygon.
Described cladding structure can be one deck, two-layer or multilayer, and reflection efficiency is improved.Also can be radially or angle periodic structure or aperiodic structure.
The material in described core district can be air, vacuum, other gas (making frequency multiplication as rare gas uses or other tested gas) or liquid (as high non-linearity medium or other fluid to be measured); The medium of described cladding structure is plastics, glass or the quartz glass of low absorbing light, high index of refraction, and described protective casing is plastics or other light-proof material.
Hollow-core fiber compared with prior art of the present invention has tangible advantage and effect.Because its principal character of hollow-core fiber of the present invention is to have a pair of on all directions or number pairing approximation right angle sample (rescinded angle) prism or its layer structure, or close packing or pine that isometrical cylinder constitutes are arranged layer structure, light is transmission longitudinally mainly, laterally, light in cladding structure through twice or repeatedly (be similar to) total reflection, return to the hollow district, confine optical beam is dispersed and is formed guided mode thus.This fiber nonlinear effect is little, and loss is little, and the wavelength coverage of single mode operation is big, can transmit ultrashort pulse, or makes other photoelectric device.
Four, description of drawings
Fig. 1 is a kind of right-angle prism hollow-core fiber cross-sectional structure synoptic diagram of the present invention.
Fig. 2 is a kind of porous air core fibre cross-sectional structure synoptic diagram of the present invention.
Fig. 3 is a kind of cylinder close packing hollow-core fiber cross-sectional structure synoptic diagram of the present invention.
Fig. 4 is that a kind of cylinder pine of the present invention is arranged hollow-core fiber cross-sectional structure synoptic diagram.
Five, embodiment
Below the invention will be further described for the contrast accompanying drawing.
Right-angle prism hollow-core fiber (shown in Figure 1).It is made of hollow district 1, cladding structure 2 and protective casing 4; it is characterized in that on the xsect of this optical fiber; cladding structure 2 is to be made of the space 3 outside the right-angle prism quadrilateral of high-index material and the prism; light is transmission longitudinally mainly; and lateral light is from 1, core district directive cladding structure 2; after in cladding structure, forming twice total internal reflection, penetrate go back to core district 1 again, form guided mode.
Porous air core fibre (see figure 2), its cladding structure 2 are the right-angle triangle small structures 3 that contain a plurality of square arrangement, the adjacent straight arm of angle of its two adjacent holes, the right-angle prism or the approximate right angle prism of formation rescinded angle.The right-angle triangle aperture of square arrangement can have the several layers structure, every layer of aperture certain position that staggers, and be arranged to inverted triangle at outermost layer, it can make light form total reflection.
Cylinder close packing hollow-core fiber (see figure 3), its cladding structure 2 are close packing layer structures that isometrical cylindrical dielectric is lined up.Promptly just in time aim at the depression position of adjacent close packing layer at the protrusion position of first, second and third layer cylinder, the centre has than low-refraction and more low-melting medium bonding.Two interlayers form subtriangular hollow region.The 3rd layer cylindrical center aligns with the cylindrical center of the second layer.
The cylinder pine is arranged the hollow-core fiber (see figure 4), promptly arranges the isometrical cylindrical dielectric of several layers around the core district.
Implementing the present invention can adopt following technology to carry out:
For plastic optical fiber: but the one-shot forming of right-angle prism hollow-core fiber.
For glass optical fiber:
1. right-angle prism hollow-core fiber.Available die pressing prepares glass optical fiber prefabricating stick, the polishing fully reflecting surface, and wire drawing adds cover.
2. approximate right angle porous air core fibre.Be pressed into rectangular cells, be pressed into 4 or 3 one group more 1., earlier, or 14 triangle glass bars, the centre stays two holes, with synthetic one group of square hot pressing, perhaps uses die casting, forms unit with holes.Wire drawing.2., silk is pressed into precast rod again by designing once.3., compose and lay out by design more at last, pressing, wire drawing adds cover.
3. cylinder shape medium synthesizes hollow-core fiber, can be with 6 glass cylinder close packings, and wherein two interlayers are filled out with low melting point, the filling of low-refraction clear glass rod part, are hot pressed into sexangle cylindricality rod.After its wire drawing, be hot pressed into the sexangle cylindricality rod of bilayer or multilayer, wire-drawing shape again by design.Also can do a hollow glass cylinder optical fiber, outside pine row uniform glass is the circle silk carefully, and outermost encloses with plastic casing.
Claims (4)
1. hollow-core fiber; it is made of hollow district (1), cladding structure (2) and protective casing (4); it is characterized in that on the xsect of this optical fiber; cladding structure (2) contains the right-angle triangle small structure (3) of a plurality of square arrangement, the adjacent straight arm of angle of its two adjacent holes, the right-angle prism of formation rescinded angle; lateral light is (1) directive cladding structure (2) from the core district; after in cladding structure, forming twice total internal reflection, penetrate go back to core district (1) again, form guided mode.
2. a kind of hollow-core fiber according to claim 1, the cross sectional shape that it is characterized in that described core district (1) are square, rectangle, polygon or circle, and the cross sectional shape of described cladding structure (2) is square, circle or polygon.
3. a kind of hollow-core fiber according to claim 1 is characterized in that described cladding structure (2) can be one deck, two-layer or multilayer.
4. a kind of hollow-core fiber according to claim 1; the material that it is characterized in that core district (1) can be air, vacuum or other gas; the medium of described cladding structure (2) is that described protective casing (4) is plastics or other light-proof material to plastics, glass or the quartz glass of the low absorption of light, high index of refraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021476772A CN1186655C (en) | 2002-10-29 | 2002-10-29 | Hollow optical-fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021476772A CN1186655C (en) | 2002-10-29 | 2002-10-29 | Hollow optical-fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1412584A CN1412584A (en) | 2003-04-23 |
| CN1186655C true CN1186655C (en) | 2005-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021476772A Expired - Fee Related CN1186655C (en) | 2002-10-29 | 2002-10-29 | Hollow optical-fiber |
Country Status (1)
| Country | Link |
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| CN (1) | CN1186655C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460903C (en) * | 2006-11-20 | 2009-02-11 | 燕山大学 | Low-loss single-mode hollow fiber remaining circular polarization state |
| CN104596996B (en) * | 2015-01-06 | 2017-05-03 | 香港理工大学深圳研究院 | Gas detection method and gas detection system based on hollow-core optical fiber photothermal effect |
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2002
- 2002-10-29 CN CNB021476772A patent/CN1186655C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1412584A (en) | 2003-04-23 |
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