The present invention provides an optical fiber preform, and a preparation method therefor and a use thereof. The preparation method comprises the following steps: immersing a silicon dioxide loose body into a solution containing a rare earth chloride to obtain a first intermediate; placing the first intermediate in an MCVD lathe, introducing oxygen and helium simultaneously for a pre-oxidation treatment, and continuing introducing oxygen and helium for an oxidation treatment to obtain a second intermediate, wherein the introduction flow rate of oxygen for the pre-oxidation treatment is V1, the introduction flow rate of oxygen for the oxidation treatment is V2, and V1 and V2 satisfy V1:V2 = 1:(5-10); the temperature for the oxidation treatment is greater than the temperature for the pre-oxidation treatment; and the pressure for the pre-oxidation treatment is greater than the pressure for the oxidation treatment; and sequentially subjecting the second intermediate to a sintering treatment and a melting shrinkage treatment to obtain the optical fiber preform. Sufficient oxidation of a rare earth element and maximized removal of hydroxyl can be achieved, facilitating the reduction of the optical fiber loss. The preparation method has an excellent environmentally friendly performance and safety and is suitable for mass production.
C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur
A low-loss bend-resistant single-mode optical fiber (10), comprising, from the center toward the outside, a core layer (11), a first inner cladding layer (12), a second inner cladding layer (13), a depressed cladding layer (14), and an outer cladding layer (15) which are sequentially arranged. The outer radius of the first inner cladding layer (12) is R2, the width R2-R1 of the first inner cladding layer (12) ranges from 1 μm to 4 μm, and a relative refractive index difference Δ2 between the first inner cladding layer (12) and the outer cladding layer (15) ranges from -0.2% to 0%; the outer radius of the second inner cladding layer (13) is R3, the width R3-R2 of the second inner cladding layer (13) ranges from 1 μm to 4 μm, and a relative refractive index difference Δ3 between the second inner cladding layer (13) and the outer cladding layer (15) ranges from -0.1% to 0.1%; and the first inner cladding layer (12) and the second inner cladding layer (13) which have different refractive indices are arranged between the core layer (11) and the depressed cladding layer (14). By adjusting the difference value of a refractive index difference between the first inner cladding layer (12) and the second inner cladding layer (13), a zero-dispersion wavelength shifts towards a long wavelength direction, and the slope of the zero-dispersion wavelength is reduced, achieving compatibility with G.652 dispersion standard requirements.
222. By means of adjusting the elements doped in the inner core layer (100) and the outer core layer (200), Rayleigh scattering is decreased, thereby achieving the aim of reducing the attenuation coefficient of the optical fiber, such that the optical fiber has lower attenuation loss and better bending resistance.
Provided in the present application are a fine-diameter low-loss optical fiber and an optical cable. The fine-diameter low-loss optical fiber comprises a quartz layer, an adhesive layer, a first coating layer and a second coating layer which are successively arranged from inside to outside in the radial direction of the fine-diameter low-loss optical fiber; the adhesive layer is used for increasing the adhesive force between the first coating layer and the quartz layer, and the first coating layer is used for protecting the quartz layer; the second coating layer comprises a second coating layer base body and a plurality of reinforcing members, the base material of the second coating layer base body being the same as that of the first coating layer, and the plurality of reinforcing members being distributed in the second coating layer base body so as to increase the strength of the fine-diameter low-loss optical fiber. The fine-diameter low-loss optical fiber provided in the present application has relatively large strength, and the adhesive force between the coating layer and the quartz layer in the fine-diameter low-loss optical fiber is relatively large.
An ultra-low-loss and large-effective-area optical fiber, sequentially comprising, from inside to outside, a core layer (10), an inner cladding layer (20), a depressed cladding layer (30) and an outer cladding layer (40), wherein the depressed cladding layer (30) comprises a deep depressed layer (31), a depressed step layer (32) and a depressed platform layer (33). The ultra-low-loss and large-effective-area optical fiber having a specific refractive index profile structure has a relatively good bending resistance performance, an optical-cable cutoff wavelength of no more than 1520 nm, and a relatively low macro-bending loss, and also has a relatively small difference in attenuation coefficients between a short-wavelength C-band of 1520 to 1565 nm and a long-wavelength L-band of 1565 to 1625 nm. The ultra-low-loss and large-effective-area optical fiber can meet the G.654.E optical-fiber standards, and can be used in ultra-high-voltage electric power communication, ultra-high-speed communication lines of submarine cables or land trunks, etc.
The present application provides an optical fiber and a manufacturing method therefor. The optical fiber comprises a core layer, an inner cladding layer, a depressed layer, an outer cladding layer, and a coating layer in sequence from inside to outside. The manufacturing method comprises: preparing a core layer, an inner cladding layer, and a depressed layer in sequence by using a VAD technology, and preparing an outer cladding layer by using an OVD technology, so as to obtain an optical fiber preform precursor; collapsing and cooling the optical fiber preform precursor to obtain an optical fiber preform; then performing melting and wire drawing on the optical fiber preform, and annealing same in an inert gas atmosphere, so as to obtain a bare fiber; and coating and curing the bare fiber to obtain an optical fiber. According to the present application, when the optical fiber preform is manufactured, the design of combining an inclined inner cladding layer with a wide recess and shallow fluorine doping is used, so that the refractive index difference between the core layer and the depressed layer is effectively reduced, the optical fiber has high strength, the bending resistance of the optical fiber is enhanced, and the bending loss is greatly reduced; the collapsed optical fiber preform uses a specific cooling technology and is naturally cooled in an inert atmosphere after undergoing melting and wire drawing, so that the internal stress of the optical fiber is further reduced, and the loss of the optical fiber is effectively reduced.
C03B 37/023 - Fibres constituées de différentes variétés de verre, p. ex. fibres optiques
C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur
C03C 17/34 - Traitement de surface du verre, p. ex. du verre dévitrifié, autre que sous forme de fibres ou de filaments, par revêtement avec au moins deux revêtements ayant des compositions différentes
The present invention provides an optical fiber drawing furnace, an optical fiber preparation apparatus, an optical fiber preparation method, and a small-diameter optical fiber. The optical fiber drawing furnace comprises a heating graphite piece and a gas inlet pipeline; the heating graphite piece comprises a first graphite segment, a second graphite segment, and a third graphite segment that are sequentially connected; the gas inlet pipeline comprises a main pipeline, a first annular pipeline, and a second annular pipeline; first gas inlets are formed in the first annular pipeline at intervals, the gas inlet directions of the first gas inlets are perpendicular to the axial direction of a first cylindrical cavity, and an included angle between the gas inlet direction and a tangential direction is 30-60 degrees; a plurality of second gas inlets are formed in the second annular pipeline at intervals, the gas inlet directions of the second gas inlets are perpendicular to the axial direction of a second cylindrical cavity, and an included angle between the gas inlet direction and the tangential direction is 30-60 degrees; and the gas inlet directions of a plurality of first gas inlets and the gas inlet directions of the plurality of second gas inlets all are changed in a clockwise direction or a counterclockwise direction as a whole. The present invention greatly improves the stability of a melting and drawing process.
Disclosed are an optical fiber structure, a method for producing the optical fiber structure, and an optical cable structure. The optical fiber structure comprises: a fiber core, a cladding layer and a coating layer, wherein the diameter of the fiber core is a target threshold value; the cladding layer is located on an outer layer of the fiber core, and a first target material is added to the cladding layer, wherein the first target material is used for improving the bending resistance of the fiber core; and the coating layer is located on an outer layer of the cladding layer, and the coating layer uses a second target material, wherein the second target material is used for improving the strength of the optical fiber structure. By means of the present invention, the technical problem of it not being possible for the optical fiber capacity of an OPGW optical cable to meet requirements is solved.
Provided is a method for preparing an optical fiber, the method comprising the following steps: preparing a powder body mandrel; sequentially subjecting the powder body mandrel to dehydroxylation and sintering treatments to obtain a glass rod, wherein the dehydroxylation treatment comprises placing the powder body mandrel in a dehydroxylation atmosphere containing a fluorine-containing gas for dehydroxylation, and the hydroxyl content of the glass rod is less than 5 ppm; forming an outer cladding layer on the surface of the glass rod to obtain an optical fiber preform rod; drawing the fiber preform rod into a filament, and subjecting the filament to a temperature-maintained annealing treatment; and coating the surface of the filament with a resin and then performing ultraviolet curing to obtain an optical fiber. Further provided is an optical fiber prepared by using the method for preparing an optical fiber.
An optical fiber (100), and a preparation method therefor. The optical fiber (100) comprises a core layer (10), and a cladding layer (20) surrounding the core layer (10). The cladding layer (20) comprises an inner cladding layer (21), a first depressed layer (22), a second depressed layer (23) and an outer cladding layer (24) that are arranged in a cladded manner, wherein the single-side width of the first depressed layer (22) is greater than the single-side width of the second depressed layer (23); the relative refractive index of the first depressed layer (22) ranges from -0.03% to -0.06%; and the relative refractive index of the second depressed layer (23) ranges from -0.08% to -0.15%. A coating layer (30) is further comprised outside the outer cladding layer (24), and the coating layer (30) comprises a first coating layer (31) and a second coating layer (32) that are arranged in a cladded manner, wherein the diameter of the second coating layer (32) ranges from 175 μm to 195 μm. The size of the optical fiber (100) can be reduced, and the bending resistance performance of the optical fiber (100) can be improved.
G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
C03C 25/50 - Revêtements contenant uniquement des matériaux organiques
C03B 37/027 - Fibres constituées de différentes variétés de verre, p. ex. fibres optiques
C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur
An optical fiber, comprising a core layer (1), a buffer cladding layer (3), a recessed cladding layer (5), a deep fluorine-doped layer (7), an outer cladding layer (9) and a coating in order from the inside to the outside, wherein the core layer (1) is a germanium-doped silica that has a refractive index difference of 0.37 to 0.5% relative to silicon dioxide; the refractive index of the buffer cladding layer (3) is a graded structure, the refractive index at an inner interface thereof in contact with the core layer (1) has a refractive index difference of -0.05 to 0.1% relative to silicon dioxide, and the refractive index at an outer interface thereof in contact with the recessed cladding layer (5) is equal to the refractive index of the recessed cladding layer (5); the recessed cladding layer (5) has a refractive index difference of -0.12 to -0.2% relative to silicon dioxide; the deep fluorine-doped layer (7) has a refractive index difference of -0.3～-0.5% relative to silicon dioxide; the outer cladding layer (9) is silicon dioxide, and the coating is coated on the outer cladding layer (9). The optical fiber has the advantages of a large mode field diameter and resistance to bending.
Disclosed is an optical fiber (100), sequentially including, from a core layer to an outer layer, a quartz core layer (101), a quartz cladding layer (102), a primary coating layer (103) formed from a first polyimide coating with a viscosity of 5000-8000 cps, and a secondary coating (104) formed from a second polyimide coating with a viscosity of 6000-7000 cps. The temperature resistance grade of the optical fiber (100) is 300-350ºC. The optical fiber (100) has two polyimide coating layers. By controlling the viscosity of a polyimide and designing the material, the optical fiber (100) not only has the high temperature resistance of a polyimide material, but also has a lower attenuation and better mechanical performance. The optical fiber (100), which is capable of resisting a high temperature of 300-350ºC, is produced. The optical fiber (100) has an attenuation of ≤0.8 dB/km at 1310 nm, and an attenuation of ≤0.6 dB/km at 1550 nm. The optical fiber (100) has a screening strength of higher than 100 kpsi, thus being suitable for use in harsh environments, is resistant to corrosion, has a high reliability, and can also be used on the seabed.
An optical fiber and a forming method therefor. The method comprises the following steps: melting an optical fiber preform at a high temperature of over 2000°C, and pulling and drawing same into a filament; cooling the temperature of the filament to 45-55°C; coating the surface of the cooled filament with an acrylic resin or an organic silicon resin, and then performing ultraviolet curing to obtain a primarily-coated filament; and coating the surface of the primarily-coated filament with a silicone resin, and then performing UV curing to obtain an optical fiber. Double-layer coating is performed by using an acrylic resin (or an organic silicon resin) and an organic silicon resin, so that the diameter of an optical fiber reaches 245μm, and the optical fiber can be used at 200°C for a long time, and has stable performance; and the optical fiber can be used for at least 7 days at 250℃ for a short period of time.
A test fixture (100) comprises a bottom plate (10), at least one floating plate assembly (20), and a driving assembly (30) corresponding to the floating plate assembly (20). Each driving assembly (30) is mounted on a side of the bottom plate (10). Each floating plate assembly (20) is slidably mounted on the bottom plate (10). Each driving assembly (30) is connected to the floating plate assembly (20). Multiple first winding assemblies (11) are provided on the bottom plate (10). Each floating plate assembly (20) comprises multiple second winding posts (25). Each first winding assembly (11) and a corresponding second winding post (25) work together to bend an optical fiber under test, such that when being wound, the optical fiber is evenly stressed, thereby improving the accuracy of test data. A test system (200) automatically acquires and analyzes macro bending loss data according to a pre-configured program, and is therefore highly automated. The method of use for the test system (200) only requires manually connecting an optical fiber to the test system (200) once, thereby reducing interference from human factors on the test data, and improving the accuracy of measurement results.
A novel optical fiber, sequentially comprising a single-mode fiber core, a multi-mode layer, and an outer cladding which are coaxially arranged from inside to outside. The single-mode fiber core is located at the center of the optical fiber and has an upper step refractive index. The multi-mode layer surrounds the single-mode fiber core and has a refractive index of α profile distribution. A plurality of transition layers are arranged on the inner side of the multi-mode layer and/or the outer side of the multi-mode layer. The transition layers and the single-mode fiber core or the outer cladding layer are coaxially arranged, the transition layers are tightly attached to the multi-mode layer, and the refractive index of the transition layers is equal to the refractive index of the contact part of the multi-mode layer. The novel optical fiber has both single-mode transmission and multi-mode transmission, data center optical cable management is greatly simplified, future transceiver upgrading cost is lowered, and the optical fiber has good low-loss characteristics by arranging the transition layer. In addition, the optical fiber has good bending resistance due to the design of a lower doping layer or a concave layer.
Provided are a device and a method for measuring the degree of optical fiber distortion, which belong to the technical field of optical fiber tests. The device comprises a test platform, an optical fiber holder, an optical fiber clamping member, and a drive motor. A slide rail is disposed horizontally on the test platform. The optical fiber clamping member is slidably mounted on the slide rail. The test platform, the fiber holder, the slide rail, and the optical fiber clamping member are connected to the drive motor. The device is characterized in that: the device further comprises a photoelectric detector, and the photoelectric detector is used to detect and record the occurrence count of an identification member disposed at an optical fiber to be tested, so as to obtain a degree of optical fiber distortion of the optical fiber to be tested. In the present invention, the majority of test operations are automatically controlled by a drive motor, and so a single person can perform the test. The operations are easy, manual costs are reduced, and test results are more accurate; hence, the present invention can be widely applied in the field of optical fiber distortion testing.
G01B 11/26 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer des angles ou des cônesDispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour tester l'alignement des axes
G01B 5/24 - Dispositions pour la mesure caractérisées par l'utilisation de techniques mécaniques pour mesurer des angles ou des cônesDispositions pour la mesure caractérisées par l'utilisation de techniques mécaniques pour tester l'alignement des axes
A feeding device, comprising a storage barrel (10), a feeding tube (30) and a discharging tube (40) that extend into the storage barrel (10), a coating container (41) connected to the discharging tube (40), a support rod (20) and a plurality of bubble detecting sensors (13) that are disposed within the storage barrel (10), a floating ball (22) sleeved on the support rod (20), and a receiving container (21) disposed at an end of the support rod (14); an outlet (32) of the feeding tube (30) extends into the receiving container (21), and the floating ball (22) moves up and down following changes in the liquid level within the storage barrel (10). The feeding device has a simple structure, is convenient to use, may eliminate air bubbles that are mixed in paint, ensure that paint pressed into the coating container has no air bubbles, ensure the quality of an optical fiber, and increase the yield of the product.
An automatic optical fiber wire feeding device and method, the method comprising: for an optical fiber that has attained the condition of passing through a hole, after a first optical fiber detector (3) detects the optical fiber, the optical fiber being clamped by means of an optical fiber clamping mechanism (2); transferring the optical fiber clamping mechanism (2) to above a mold (8) by moving a transfer mechanism (4) on a slide rail (42) after passing through a positioning roller; after the mold (8) is opened, releasing the optical fiber clamping mechanism (2); after the optical fiber passes through the mold (8) and then reaches a next positioning roller, closing the mold (8), thereby completing the process of automatic optical fiber wire feeding. The whole process eliminates manual intervention, which improves the success rate of wire feeding and reduces production process time delays.
A fiber drawing furnace and a fiber drawing method. The fiber drawing furnace comprises a furnace body (1), a heat insulating body (2), a heating body (3), rotation driving means (4), and a heater (5); the heat insulating body (2) is provided in the furnace body (1) and wraps the heating body (3); the rotation driving means (4) is used for driving the heating body (3) to rotate; the heater (5) is provided at the periphery of the furnace body (1), and comprises a heating coil; during fiber drawing, a fiber preform passes through a hollow space inside the heating body (3) for drawing. According to the fiber drawing furnace, the volume of the furnace body is reduced so that the amount of introduced inert gas is reduced and energy consumption is reduced; moreover, a uniform and stable thermal field can be formed so that the stability of fiber production is improved.
C03B 37/025 - Fabrication de fibres ou de filaments de verre par étirage ou extrusion à partir de tubes, tiges, fibres ou filaments ramollis par chauffage
20.
Optical fiber, and system and method for manufacturing optical fiber
An optical fiber comprises, from a center to a periphery, a fiber core of undoped silica; a cladding layer; and a coating of polyacrylate, wherein the fiber core has a radius of 5 to 7 μm and an ellipticity of less than 1.5%, the cladding layer with an ellipticity of less than 0.4% comprises inner, intermediate, and outer cladding layers, the inner cladding layer being doped with fluorine of 5 to 12 μm thickness, and refractive index difference to fiber core of −0.4 to −0.2%, the outer cladding layer being undoped quartz of 25 to 45 μm thickness, and the coating comprises an inner coating of 25 to 40 μm thickness, and an outer coating of 25 to 35 μm thickness and an ellipticity of less than 2%. The optical fiber has high durability and large effective transmission area, a method and system for preparing such optical fiber are also disclosed.
C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur
C03B 37/014 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques
21.
APPARATUS FOR SEALING FURNACE MOUTH OF DRAWING FURNACE AND CONTROL METHOD THEREFOR
An apparatus for sealing a furnace mouth of a drawing furnace and a sealing control method. The apparatus comprises: an extendable and retractable sealing ring which is provided coaxially with the furnace mouth of the drawing furnace; an air extracting/inflating device which extracts air from or inflates air to the extendable and retractable sealing ring to change the pressure in the extendable and retractable sealing ring and correspondingly change the inner diameter of the extendable and retractable sealing ring; a laser diameter measuring instrument for measuring the actual diameter of an optical fiber preform; a pressure sensor for measuring the pressure in the extendable and retractable sealing ring; and a controller which analyzes, according to the measured pressure in the extendable and retractable sealing ring and the measured actual diameter of the optical fiber preform, diameter data of the optical fiber preform to control the air extracting/inflating device to extract air from or inflate air to the extendable and retractable sealing ring, so that the inner ring surface of the extendable and retractable sealing ring always abuts against the optical fiber preform. The control method can seal a gap between the furnace mouth of the drawing furnace and the optical fiber preform.
C03B 37/025 - Fabrication de fibres ou de filaments de verre par étirage ou extrusion à partir de tubes, tiges, fibres ou filaments ramollis par chauffage
Disclosed is an optical fibre drawing furnace, comprising a furnace body, and further comprising: a furnace core pipe, the furnace core pipe penetrating from a first surface of the furnace body to a second surface of the furnace body, the furnace core pipe comprising a straight barrel portion, a tapered portion and a diameter-reduced pipe portion connected in a one-time fixing manner, the straight barrel portion and the tapered portion being located inside the furnace body, the straight barrel portion being arranged in a first part of the furnace body, the inner diameter of the tapered portion tapering from a central part of the furnace body to a second part of the furnace body, and the diameter-reduced pipe portion being located outside the furnace body; a heating body, the heating body being located inside the furnace body and wrapped around the straight barrel portion and the tapered portion of the furnace core pipe; and a heat preservation body for heat insulation, the heat preservation body being located inside the furnace body and arranged between the heating body and the furnace body.
An optical fiber comprises, from center to periphery, a fiber core layer (11), a cladding layer (12), and a coating (13). The fiber core layer (11) is a pure silica glass layer, with a thickness of 5 to 7 μm. Ellipticity of the fiber core layer (11) is less than 1.5%. The cladding layer (12) comprises an inner cladding layer (121), an intermediate cladding layer (122), and an outer cladding layer (123). The inner cladding layer (121) is doped with fluorine, and has a thickness of 5 to 12 μm. A relative refractive index difference between the inner cladding layer (121) and the fiber core layer (11) is -0.4 to -0.2%. The intermediate cladding layer (122) has a thickness of 12 to 25 μm. The outer cladding layer (123) is a pure quartz glass layer, with a thickness of 25 to 45 μm. Overall ellipticity of the cladding layer (12) is less than 0.4%. The coating (13) is made of polyacrylate, and comprises an inner coating (131) and an outer coating (132). The inner coating (131) has a thickness of 25 to 40 μm and the outer coating (132) has a thickness of 25 to 35 μm. Ellipticity of the outer coating (132) is less than 2%. The optical fiber of the present invention has high durability and a large effective area. An optical fiber preparation process and an optical fiber preparation system are also disclosed.
G02B 6/036 - Fibres optiques avec revêtement le noyau ou le revêtement comprenant des couches multiples
C03B 37/018 - Fabrication d'ébauches d'étirage de fibres ou de filaments obtenues totalement ou partiellement par des moyens chimiques par dépôt de verre sur un substrat de verre, p. ex. par dépôt chimique en phase vapeur
C03B 37/027 - Fibres constituées de différentes variétés de verre, p. ex. fibres optiques
C03C 25/12 - Procédés généraux de revêtementDispositifs à cet effet
brevets
