134 results about "Optical fiber fabrication" patented technology

The invention discloses a polarization maintaining optical fiber with a small bending radius and a manufacture method of the polarization maintaining optical fiber and relates to the field of optical fiber manufacture. The polarization maintaining optical fiber comprises a silica cladding, a core layer, a second silica cladding ring, a third fluorine-doped silica cladding ring and two stress cat eyes are sequentially arranged in the silica cladding from inside to outside, and the two stress cat eyes are in central symmetry with the core layer. By means of the manufacture method, the bending radius of the manufactured polarization maintaining optical fiber is smaller than 5mm, operating wavelength of the polarization maintaining optical fiber is 1550nm, and supplementary deterioration of the polarization maintaining optical fiber is under 0.4dB/km. According to the polarization maintaining optical fiber, under the condition that the bending radius is small, low-loss information transmission of the polarization maintaining optical fiber is achieved, low supplementary deterioration and good crosstalk characteristics of the polarization maintaining optical fiber are guaranteed, fiber optic sensors with small sizes can be manufactured by means of the polarization maintaining optical fiber, and requirements of users are satisfied.

The invention discloses a method for manufacturing an external coating layer of an optical fiber preform rod through a sleeve method, belongs to an optical fiber manufacturing technology and aims to overcome the defects of sleeve waste and the like in the manufacturing of an external coating layer of an optical fiber preform rod through a sleeve method in the prior art. In the invention, a core rod is welded onto an auxiliary glass rod, an external diameter enlarged part is arranged at the welding position, and the whole core rod is concentrically inserted into a sleeve, thus forming an annular space between the external surface of the core rod and the internal surface of the sleeve; the circumference of the sleeve is provided with at least three recess parts for fixing the core rod; a blowtorch is used to heat the external diameter enlarged part which seals the sleeve and the core rod, and negative pressure is applied to the annular space; and the blowtorch is moved to heat the sleeve and the core rod, so that the sleeve can collapse onto the core rod to form a solid optical fiber preform rod. According to the invention, the sleeve utilization rate is high; the existing improved chemical vapor deposition equipment can be fully utilized, no additional equipment investment is required, the production cost can be lowered, and the production time can be saved; and the optical fiber preform rod manufactured by the method has favorable physical dimension.

The invention relates to energy transfer optical fibers. The technical problem to be solved is to provide a high anti-damage energy transfer optical fiber and a manufacturing method, which can solve the problems of low numerical aperture, high loss, low damage threshold value, high manufacturing cost and the like of the energy transfer optical fiber, and the manufactured optical fiber has high anti-damage capability and can transmit high-power laser. The invention is characterized in that the material of the optical fiber is pure quartz; the material of a cladding is a low-refractivity organic compound; and the material of an outer protection layer is a high-modulus organic compound. The pure quartz has theoretical maximum damage threshold value and low loss, and the cladding made of the low-refractivity material enables the optical fiber to have extremely high numerical aperture, so that the optical fiber has small transmission loss, high damage threshold value, strong bending-resistant performance and capability of transmitting the high-power laser. The high anti-damage energy transfer optical fiber is manufactured through drawing by directly utilizing a synthesized pure quartz pipe or bar as a fiber core, and an optical cladding is directly coated in the wire drawing process, so that the manufacturing process of the optical fiber is simplified, and the manufacturing cost is greatly lowered.

A method of applying spin to a coated optical fiber to be rotated on its longitudinal axis so that the optical fiber has an ultra-low PMD (Polarization Mode Dispersion) includes the steps of: guiding the coated optical fiber so as not to be deviated from a certain range off a drawing axis at a lower end of an optical fiber coating point; giving torque to the optical fiber by contacting the coated optical fiber with a driving roller which vibrates on the center of an axis substantially parallel to a drawing direction at a lower end of the guiding point; and adjusting an amplitude (A) of the driving roller and a distance (l) between the guiding point and the vibrating point so as to control an angle (θ) between the vibrating optical and the drawing axis. This makes it possible to control a spin rate (spins/m) of the optical fiber generated by rotation.

The invention discloses a manufacturing method of a porous optical fiber preform, and relates to the field of new material. The method includes the steps of: preparing a mandril by using a conventional communication optical fiber preparation method, wherein the mandril contains a germanium doped quartz core layer and a pure silica quartz cladding arranged on periphery of the core layer, and the germanium doped quartz core layer and the pure silica quartz cladding are concentric circles; opening a certain number of arc slots on angles of the mandril outer edge, according to design requirements of a porous bending insensitive optical fiber, immersing the mandrel with arc slots with acid solution to remove impurities, washing by deionized water and drying; sleeving a quartz casing on the mandrel with arc slots; inserting capillaries into the arc slots to form the desired pore, thereby preparing the porous optical fiber preform. The method of the invention can realize precise positioning of micropores in the manufacturing process of porous optical fiber, improve polarization mode property and bending loss property of the porous optical fiber, reduce impurity pollution in the processing process of the porous optical fiber preform and improve attenuation property of the porous optical fiber.

The invention relates to the field of optical fiber manufacturing detection and discloses a macrobend loss testing device for optical fiber automatic winding counting. An optical fiber disc pay-off device, a line arrangement device and an optical fiber winding device are sequentially arranged on a rack; the line arrangement device is provided with a lead screw; a fiber guide hole is formed in thelead screw; and an optical fiber paid off by the optical fiber disc pay-off device passes through the fiber guide hole and is pulled to the optical fiber winding device; the optical fiber winding device is provided with a diameter fine adjustment unit; a motor rotating shaft drives an optical fiber winding device rotating shaft through a belt wheel; the optical fiber winding device rotating shaftdrives the lead screw of the line arrangement device to rotate through the belt wheel; and the optical fiber winding device rotating shaft drives an optical fiber winding counter rotating shaft through the belt wheel. Through the structure, after the number of turns of winding reaches the standard requirement, the shaft diameter fine adjustment device is loosened, so that the optical fiber meetingthe standard requirement is not stressed after being wound, and the accuracy of an optical fiber macrobend loss test result is improved. Meanwhile, the invention further discloses a test method of the device.

An expeditious method for introducing geometric perturbations into lightguide during fabrication offers a perturbation stream of amplitude and periodicity—constant or varying—to satisfy a variety of needs.

Systems and methods are disclosed for an automatic and continuous supply of coating material to a coating applicator in optical fiber fabrication. The present invention switches from one coating reservoir to another by way of a transitional period in which both coating reservoirs are supplying coating material to the coating applicator. For example, while an in-use reservoir is supplying the coating material to the coating applicator, a standby reservoir is being filled, settled to off gas air bubbles and then slowly pressurized. A sized orifice is used to slowly bleed off pressure from the in-use reservoir at a rate that does not allow the pressure in the in-use reservoir from falling out of a desired pressure range. When the in-use reservoir is substantially emptied of coating material and the pressures in both reservoirs are substantially equalized, then both reservoirs simultaneously supply coating material to the coating applicator for a period of time before switching completely over to the standby reservoir.

The invention belongs to the technical field of optical fiber manufacturing and discloses a manufacturing method of a polarization maintaining optical fiber. The manufacturing method comprises the following steps: on the wall of a first-layer casing pipe, symmetrically cutting a gap for the center line of the cavity of the first-layer casing pipe; filling a stress rob at the gap and embedding an optical fiber preform in the first-layer casing pipe; embedding a second-layer casing pipe outside the first-layer casing pipe to form a polarization maintaining optical fiber preform; and wiredrawing the polarization maintaining optical fiber preform to form the polarization maintaining optical fiber, wherein the structure of the gap is filled by the stress rod, and in the high-temperature wiredrawing process, the round stress rod is softened to greatly fill the clearance in the gap so as to form a stress region required by the polarization maintaining optical fiber. Through the matching of the two casing pipes and the stress rod, the manufacturing method of the polarization maintaining optical fiber is simple in structure and has the advantages of greatly simplifying the processing process, reducing the manpower and equipment requirements, greatly improving the influence from the impurities to the product quality and avoiding various high-precision operation requirements in the prior art.

The invention discloses an induction furnace water temperature constant automatic control system comprising an induction furnace body which has a hollow cylindrical structure comprising an internal cylinder and an external cylinder. A bar-delivering device is fixed at the side surface of the external cylinder. A clamping disc is fixedly installed on the bar-delivering device. The clamping disc is arranged exactly above the induction furnace body. The side surface of the top part of the external cylinder is communicated with a water inlet pipe and a water outlet pipe. The water inlet pipe and the water outlet pipe are respectively provided with a valve A and a valve B. The system also comprises a heater, a temperature sensor, a liquid flow meter and a photosensitive sensor. Besides, the valve A and the valve B are connected with a PLC controller. The invention also discloses a control method of the induction furnace water temperature constant automatic control system. With combined action of the heater, a temperature controller, the PCL controller, the temperature sensor, the liquid flow meter and the pipeline transmitting valves, the objective of induction furnace water temperature constant automatic control is realized so that the structure is simple, the technology is table, lagging is reduced and the effect is obvious, and thus the induction furnace water temperature constant automatic control system is beneficial for wide-range popularization and use in the optical fiber manufacturing industry.

The invention relates to a method for detecting work efficiency of a PMD rubbing and twisting device for optical fibers, and belongs to the technical field of optical fiber manufacturing. The method is a test for carrying out optical fiber actual twisting manually, optical fiber twisting samples with a length of 2 m are taken, two testing methods are adopted to test the directions and the times of twisting of the optical fiber twisting samples, a sine period curve chart is generated according to testing data, and then the oscillation amplitude and the frequency of a PMD rubbing and twisting wheel are adjusted according to the sine period curve chart. According to the method for detecting the work efficiency of the PMD rubbing and twisting device for the optical fibers, the operation effects of the PMD rubbing and twisting device can be detected macroscopically, PMD rubbing and twisting parameters can be adjusted effectively in time, and therefore monitoring on the operation effects of a high-speed rolling wheel clamping type optical fiber PMD rubbing and twisting device is achieved. The problem that waste products appear frequently in production due to insufficient monitoring is solved, and the gap that operation situations of the high-speed rolling wheel clamping type optical fiber PMD rubbing and twisting device cannot be monitored in a current optical fiber high-speed wire drawing technology is filled in.

The invention provides a vacuum wiredrawing furnace for optical fiber manufacturing. The vacuum wiredrawing furnace comprises an optical fiber preform, a wiredrawing furnace chamber outer cover, a wiredrawing furnace body, a second vacuum area outer cover, a core heating area outer cover, a heating coil and a graphite part, wherein a first vacuum area is defined by the wiredrawing furnace chamberouter cover, the second vacuum area outer cover and the wiredrawing furnace body; a second vacuum area is defined between the second vacuum area outer cover and the wiredrawing furnace body; a core heating area is defined between the core heating area outer cover and the wiredrawing furnace body; the optical fiber preform sequentially penetrates through the wiredrawing furnace chamber outer cover,the second vacuum area and the wiredrawing furnace body and extends into the bottom of the core heating area in the wiredrawing furnace; the graphite part is arranged at the bottom of the core heating area, and a circle of the heating coil is arranged on the upper side of the graphite part in the circumferential direction of the optical fiber preform. According to the vacuum wiredrawing furnace,the structural design is more optimized, impurity pollution is avoided, the cost is lower and the consistency of optical fiber parameters is better when common optical fibers are drawn, and the capability of drawing photonic crystal optical fibers with a complex structure is achieved.

The invention belongs to the technical field of optical fiber manufacturing, and particularly discloses a preparation method of a taper-core optical fiber with a gradually-changed core-to-package ratio and the taper-core optical fiber. The method comprises the following steps: depositing a glass particle loose layer on the inner wall of a reaction tube; performing rare earth ion doping on the glass particle loose layer; drying the reaction tube, conducting sintering at high temperature, so as to vitrify the glass particle loose layer, conducting fusing to form a solid preform core rod, and then polishing the solid preform core rod to obtain a conical core rod with a specified taper angle; and conducting processing to obtain a cylindrical glass rod which is provided with a conical hollow hole, combining the glass rod with the conical hollow hole with a conical core rod to obtain a conical core active optical fiber preform, and putting the conical core active optical fiber preform into a wire drawing tower for drawing to obtain the conical core optical fiber with a gradually changed core-to-cladding ratio. The taper core optical fiber is prepared by the method. The core-to-package ratio of the prepared taper core optical fiber with the gradually-changed core-to-package ratio is gradually changed along with the length of the optical fiber, pump light absorption of the optical fiber can be improved, optical fiber heat production can be balanced, and laser output power can be improved.

The invention relates to the technical field of optical fiber manufacturing, and discloses a drawing drum take-up device for optical fiber manufacturing. The device comprises a machine body, a pressing device is arranged above the left side of the machine body, a first gear is fixedly connected to the top of a screw rod, the right side of the first gear is engaged with a second gear, and a first rotating rod is sleeved with the second gear. The surface of a fan-shaped rack is in engaged connection with a driven gear, a second rotating rod is sleeved with the driven gear, and the surface of a third rotating rod is sleeved with a belt wheel. According to the drawing drum take-up device for optical fiber manufacturing, a driving motor drives the belt wheel, the belt wheel drives the second rotating rod through the third rotating rod, the second rotating rod drives the driven gear, the driven gear drives the second gear through the fan-shaped rack, the second gear drives the first gear torotate, the first gear drives a first sliding block through the screw rod, and a drum rotates, so that the effect of orderly winding optical fiber filaments during winding is achieved.