CN116047651A - Side-emitting quartz optical fiber - Google Patents
Side-emitting quartz optical fiber Download PDFInfo
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- CN116047651A CN116047651A CN202211639200.2A CN202211639200A CN116047651A CN 116047651 A CN116047651 A CN 116047651A CN 202211639200 A CN202211639200 A CN 202211639200A CN 116047651 A CN116047651 A CN 116047651A
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- Prior art keywords
- optical fiber
- layer
- cladding
- radius
- resin coating
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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
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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
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
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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
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
- G02B6/03633—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - -
Abstract
The invention relates to a side-emitting quartz optical fiber, which comprises a core layer and a cladding layer for cladding the core layer, wherein the cladding layer is externally coated with a resin coating layer, and is characterized in that the radius R1 of the core layer is 25-40 mu m, and the relative refractive index difference delta n is 1 0 to 0.3%, the cladding radius R2 is 60 to 90 mu m, and the relative refractive index difference delta n is 2 From-0.1% to-0.03%, wherein the cladding contains bubbles with a radius of 100-400 nm as light scattering bodies, the outermost layer structure of the optical fiber is a resin coating layer, the radius R3 of the resin coating layer is 120-150 nm, and the relative refractive index difference delta n is the same as that of the optical fiber 3 The resin coating layer contains inorganic oxide particles with the radius of 50-150 nm in the range of-3% to-6%. The invention utilizes a chemical vapor deposition preform, can control the core layer and the cladding layer to form bubbles to form scattering, and the scattered light intensity is concentrated in the forward direction, namely scattered to the outer surface to form side light; the addition of inorganic oxide scattering particles in the resin coating layer can scatter the lightThe optical fiber emits light more uniformly and has better light quality.
Description
Technical Field
The invention relates to a side-emitting quartz optical fiber, and belongs to the technical field of light conduction.
Background
The quartz optical fiber can transmit optical signals to the other end with lower loss by utilizing the principle of total reflection, and has wide application in optical communication, and the coating layer basically does not leak light when transmitting light. Side-emitting optical fibers are required for decoration, measurement, medical treatment, and the like. The optical fiber not only transmits the transmitted light from the incident end to the emergent end of the optical fiber, but also leaks a part of the light from the cladding of the optical fiber, thereby forming side light emission. At present, most side-emitting optical fibers mainly comprise plastic optical fibers, and due to the limitations of technology and materials, the application and arrangement of the plastic optical fibers are influenced by the fact that the uniformity and the diameter of the plastic optical fibers are too thick.
Disclosure of Invention
The following are definitions and illustrations of some terms involved in the present invention: the layer defined as the layer closest to the axis is the core layer, the cladding layer is the outer cladding layer of the optical fiber, and the outermost layer is the coating resin layer, according to the change of the refractive index, from the center-most axis of the optical fiber. The relative refractive index difference Δni of the layers of the fiber is defined by the following equation:
wherein n is i For the absolute refractive index of a particular layer of the fibre, n c Is the refractive index of pure silica. When light interacts with a substance, it will result in a light source comprising: transmission, refraction, scattering, etc. The elastic scattering in the scattering can be further classified into Rayleigh scattering, mie scattering and the like, and the characteristics of the elastic scattering are related to parameters such as the wavelength of incident waves, the size, the density and the shape of interacted particles. According to the relation between the particle size and the wavelength of light, whether Rayleigh scattering or Mie scattering is determined, the ratio of the particle size to the wavelength is set as X, the following formula is used as a discrimination standard,
wherein r is the particle radius; lambda is the wavelength; when X <1, rayleigh scattering treatment can be determined; when X is not less than 1, the Mie scattering treatment can be judged. Rayleigh scattering refers to scattering of light in all directions when it strikes particles having a diameter much smaller than the wavelength of light, and the shorter the wavelength of light, the greater the scattering intensity, which is inversely proportional to the fourth power of the wavelength:
mie scattering refers to light scattering in the direction of travel when it strikes particles having a diameter comparable to or larger than the wavelength of light. Mie scattering is stronger in the forward direction than in the backward direction, and the directivity is more obvious. When the particle size is similar to the wavelength, resonance enhanced scattering occurs. When the problem of scattering of spherical particles under light irradiation, dimensionless particle size parameters are usually introduced, namely:
wherein D is the diameter of the particle size, m 1 Lambda is the wavelength for the refractive index around the scattering particles, and when alpha increases, the scattering light intensityThe forward set is presented.
The invention aims to provide a side-emitting quartz optical fiber which is uniform in light emission, thin in diameter and controllable in manufacturing process, aiming at overcoming the defects of the prior art.
The invention adopts the technical proposal for solving the problems that: comprises a core layer and a cladding layer for cladding the core layer, wherein the radius R1 of the core layer is 25-40 mu m, and the relative refractive index difference delta n is formed by coating resin coating layer outside the cladding layer 1 0 to 0.3%, the cladding radius R2 is 60 to 90 mu m, and the relative refractive index difference delta n is 2 From-0.1% to-0.03%, wherein the cladding contains bubbles with a radius of 100-400 nm as light scattering bodies, the outermost layer structure of the optical fiber is a resin coating layer, the radius R3 of the resin coating layer is 120-150 nm, and the relative refractive index difference delta n is the same as that of the optical fiber 3 The resin coating layer contains inorganic oxide particles with the radius of 50-150 nm in the range of-3% to-6%.
According to the scheme, the filling rate (duty ratio) of bubbles in the cladding is 10-20%.
According to the scheme, the core layer contains bubbles with the radius of 100-200 nm, and the filling rate (duty ratio) of the bubbles is 5-10%.
According to the scheme, the bubbles comprise one or more gases, and the gases are argon, nitrogen and oxygen.
According to the scheme, the core layer is a germanium-doped silica glass layer or a pure silica glass layer, and the cladding layer is a fluorine-doped silica glass layer.
According to the scheme, the resin layer material takes acrylic esters as base materials, and inorganic oxide particles with the weight ratio of 1-35% are mixed in the base materials.
According to the scheme, the inorganic oxide particles are one or more of titanium dioxide, zirconium dioxide, titanium oxide, tin oxide and zinc oxide.
According to the scheme, the radius difference between the cladding and the core is R2-R1 not less than 30 mu m.
According to the scheme, the numerical aperture of the optical fiber is 0.3-0.6.
According to the scheme, the optical fiber is formed by melting and drawing an optical fiber preform, and the optical fiber preform is prepared by chemical vapor deposition.
The beneficial effects of the invention are as follows: 1. the optical fiber uses visible light with the wavelength range of 390 nm-780 nm of a light source, a prefabricated rod is deposited by a chemical vapor phase process, a core layer and a cladding layer can be controlled to form bubbles to form scattering, the bubble size of the bubbles is 100 nm-400 nm, mie scattering occurs, the particle diameter is equivalent to the wavelength, the phenomenon of enhanced scattering occurs, and the scattered light intensity is scattered to the outer surface in a forward concentrated manner to form side light; 2. the addition of the inorganic oxide scattering particles in the resin coating layer can scatter the light guide, so that the optical fiber emits light more uniformly and the light quality is better; 3. the core cladding has a simple structure, bubble generation can be realized by utilizing a chemical gas phase process, and the diameter thickness of the optical fiber is controllable.
Drawings
FIG. 1 is a schematic view of a refractive index profile of an optical fiber in accordance with one embodiment of the present invention.
Fig. 2 is a schematic view of a radial cross-section of an optical fiber according to one embodiment of the present invention.
FIG. 3 is a graph showing the attenuation curve at wavelengths of 300nm to 800nm according to one embodiment of the present invention.
Fig. 4 is a graph showing measured optical power attenuation in accordance with one embodiment of the present invention.
Fig. 5 is a picture of a side-lit red light according to an embodiment of the present invention.
Fig. 6 is a side view of a green light-emitting picture according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to examples and figures.
Comprises a core layer 01 and a cladding layer 02 for cladding the core layer, wherein the radius of the core layer is R1, and the relative refractive index difference is delta n 1 The cladding radius is R2, and the relative refractive index difference is delta n 2 The cladding contains bubbles with radius of 100-400 nm as light scattering bodies, the outermost layer structure of the optical fiber is a resin coating layer, the radius of the resin coating layer is R3, and the relative refractive index difference is deltan 3 The resin coating layer contains inorganic oxide particles having a radius of 50 to 150nm. The core layer is a germanium-doped silica glass layer or a pure silica glass layer. The core layer may contain a plurality of bubbles 06 having a bubble radius of 100 to 200nm and a bubble filling rate (duty cycle) of 5 to 10%, the bubbles containing one or more gases such as: argon, nitrogen, oxygen, etc. The presence of air bubbles reduces the equivalent average refractive index of the entire core region. The cladding is a fluorine-doped silica glass layer; the cladding comprises a plurality of bubbles 05, the radius of the bubbles is 100-400 nm, the filling rate (duty ratio) of the bubbles is 10% -20%, and the bubbles comprise one or more gases, such as: argon, nitrogen, oxygen, etc. The presence of bubbles thereof reduces the equivalent average refractive index of the entire cladding region. In some embodiments, the optical fiber has a numerical aperture greater than 0.3, preferably greater than 0.4, and more preferably a numerical aperture of 0.6. The specific manufacturing process of the invention is as follows: forming a preform with a core layer and a cladding layer by utilizing a chemical vapor deposition process, wherein the preform passes through a heating zone at a speed of 10mm/min during sintering, the sintering temperature is 1700 ℃, and the sintering gas is 100% nitrogen, so that a bubble-free core region plus the cladding layer with bubbles or a bubble-free core region plus the cladding layer with bubbles are formed; in the optical fiber drawing process, the drawing tension is 100-200g, a low refractive index resin coating layer is used, inorganic oxide particles 04 are contained in the resin coating layer and used as light scattering bodies, so that the light leaked from the side-emitting optical fiber can be scattered out of the outer surface of the optical fiber more uniformly, the inorganic oxide is titanium dioxide, zirconium dioxide, titanium oxide, tin oxide, zinc oxide and the like, preferably titanium dioxide, and the particle radius is 50-150 nm. FIG. 3 is a graph of the attenuation spectrum tested at 300nm to 800nm for one embodiment of the present invention, attenuation > 50dB/km, < 400dB/km at the visible wavelength range. Fig. 5 is a diagram of an embodiment in which a 650nm red laser is coupled into the fiber facet and red light is scattered out of the fiber facet. Fig. 6 is a schematic diagram of a 532nm green laser coupled into the fiber end face, with green light scattered out of the fiber side in some embodiments. Table one is a table of parameters for some embodiments of the invention.
Table one:
the side light-emitting optical fiber with uniform thickness and controllable thickness can be formed by changing the refractive index profile, forming bubbles and adding scattering particles into the coating resin layer by the side optical fiber made of quartz material. The side luminous optical fiber is mainly applied to a light-transmitting atmosphere lamp, an interior atmosphere lamp and the like of a door panel of an automobile door; potential applications are the medical biology industry: such as photo-biostimulation and laser acupuncture, non-invasive sub-dermal vascular irradiation therapy or bioactive therapy, use in medical devices, realization of line light source illumination and planar light illumination, such as microscopic biological specimen illumination, etc.
Claims (10)
1. A side-emitting quartz optical fiber comprises a core layer and a cladding layer for cladding the core layer, wherein the cladding layer is externally coated with a resin coating layer, and is characterized in that the radius R1 of the core layer is 25-40 mu m, and the relative refractive index difference delta n is the same as that of the core layer 1 0 to 0.3%, the cladding radius R2 is 60 to 90 mu m, and the relative refractive index difference delta n is 2 From-0.1% to-0.03%, wherein the cladding contains bubbles with a radius of 100-400 nm as light scattering bodies, the outermost layer structure of the optical fiber is a resin coating layer, the radius R3 of the resin coating layer is 120-150 nm, and the relative refractive index difference delta n is the same as that of the optical fiber 3 The resin coating layer contains inorganic oxide particles with the radius of 50-150 nm in the range of-3% to-6%.
2. The side-emitting silica optical fiber according to claim 1, wherein said cladding has a bubble filling ratio of 10% to 20%.
3. The side-emitting silica optical fiber according to claim 2, wherein said core layer contains bubbles having a radius of 100 to 200nm and a bubble filling ratio of 5 to 10%.
4. A side-emitting quartz optical fiber according to claim 2 or 3, wherein said bubble comprises one or more gases selected from the group consisting of argon, nitrogen and oxygen.
5. A side-emitting silica optical fiber according to claim 1 or 2, wherein said core layer is a germanium-doped silica glass layer or a pure silica glass layer, and said cladding layer is a fluorine-doped silica glass layer.
6. The silica fiber of claim 1 or 2, wherein the resin layer material is based on acrylic esters, and inorganic oxide particles are mixed in the base material in a weight ratio of 1 to 35%.
7. The silica optical fiber of claim 6 wherein said inorganic oxide particles are one or more of titanium dioxide, zirconium dioxide, titanium oxide, tin oxide and zinc oxide.
8. The side-emitting quartz optical fiber according to claim 1 or 2, wherein the difference between the radii of the cladding and the core is R2-R1. Gtoreq.30 μm.
9. A side-emitting quartz optical fiber according to claim 1 or 2, characterized in that the numerical aperture of said optical fiber is 0.3-0.6.
10. The side-emitting silica optical fiber according to claim 1 or 2, wherein said optical fiber is obtained by fusion drawing of an optical fiber preform, said optical fiber preform being obtained by deposition by a chemical vapor deposition process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211639200.2A CN116047651A (en) | 2022-12-19 | 2022-12-19 | Side-emitting quartz optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211639200.2A CN116047651A (en) | 2022-12-19 | 2022-12-19 | Side-emitting quartz optical fiber |
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| Publication Number | Publication Date |
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| CN116047651A true CN116047651A (en) | 2023-05-02 |
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| CN202211639200.2A Pending CN116047651A (en) | 2022-12-19 | 2022-12-19 | Side-emitting quartz optical fiber |
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