18 results about "Microstructured optical fiber" patented technology

The invention relates to the technical field of spectrum detection, and particularly discloses a preparation method of a microstructure enhanced optical fiber and a Raman spectrometer light collection system thereof, the system comprises: a light source assembly for generating laser and performing collimation treatment on the laser to make the collimated laser irradiate a to-be-detected sample; the detection area assembly is used for placing a to-be-detected sample and positioning the to-be-detected sample; the collection assembly is used for collecting Raman scattering light generated by the sample to be detected under laser irradiation based on the microstructure enhanced optical fiber, and the optical fiber end face of the microstructure enhanced optical fiber is provided with a micro-nano structure; the geometric parameters of the micro-nano structure are determined by global optimization by using the genetic algorithm to maximize the coupling efficiency of the unpolarized diffused light in a preset wavelength range as an optimization target; and the control analysis assembly is used for carrying out signal acquisition from the collected Raman scattering light and identifying component information corresponding to the to-be-detected sample through a preset component identification model based on a signal acquisition result.

The invention relates to a hollow-core microstructure optical fiber welding method, which comprises the following steps of: 1, firstly, stripping coating layers at to-be-welded ends of two sections of optical fibers to form bare optical fiber ends, and cleaning the bare optical fiber ends; cutting the end face of the bare fiber; 2, clamping the bare optical fiber ends of the two sections of optical fibers processed in the step 1 on an optical fiber clamp of a fusion splicer, and coaxially aligning the bare optical fiber ends; the welding machine is arranged in the sealing cover; 3, aiming at the condition that the two sections of optical fibers are hollow-core micro-structure optical fibers, installing inflation valves at the external non-processing ends of the two sections of optical fibers; only one section of optical fiber is a hollow-core microstructure optical fiber, and only an inflation valve needs to be installed at the non-processing end of the hollow-core microstructure optical fiber. 4, pre-inflation is carried out, wherein the sealing cover is inflated, and the hollow-core microstructure optical fiber is inflated; and 5, after pre-inflation is completed, a welding machine is started, the two sections of optical fibers are welded, and micro-pores are filled with trace inert gas in the melting heating process so as to keep the micro-pores not collapsed. The welding power of the optical fiber can be improved, and the air holes can be prevented from collapsing.

The invention provides a cladding mode efficient filtering method for microstructure optical fibers, and relates to the technical field of optical fibers, and the method comprises the steps: taking two microstructure optical fibers which are different in structure and have a diameter difference value of a fiber core fundamental mode field within a diameter difference value range, and carrying out the non-oblique-angle cutting of the end faces of the two microstructure optical fibers through a cutting knife; and aligning the axial directions of the two sections of cut micro-structure optical fibers, and splicing at the cutting end surface to obtain a spliced micro-structure optical fiber. The method has the beneficial effects that two sections of microstructure optical fibers with different structures but similar fiber core fundamental mode field diameters are selected, oblique-angle-free cutting is carried out, splicing (welding, butt joint or coupler coupling) is carried out at the cutting end face, and it is ensured that splicing points are axially coaxial but cladding waveguide structures have differences. At a continuous connection point, because the cladding microstructures (such as air hole arrangement, number, shape and the like) of the two sections of optical fibers are discontinuous, the continuity of the cladding waveguide is damaged. Therefore, cladding mode energy is efficiently filtered or scattered, and the strength of the cladding mode energy is greatly weakened.

The present invention discloses an integrated fiber optic biosensor for microdialysis sampling and rapid separation, and its preparation method. The sensor comprises a broadband light source, a transmission optical path, a circulator, a demodulator, a dialysis membrane, a microdialysis channel, an optofluidic electrophoresis channel, an inlet, an outlet, a microinjection pump, and an electrophoresis apparatus. The preparation method includes the following steps: drawing a microstructured optical fiber with a dual-channel structure and two fiber cores; constructing a microdialysis microfluidic circuit and integrating the dialysis membrane within the optical fiber; opening holes perpendicular to the optical fiber in the microdialysis channel and the optofluidic electrophoresis channel to enable the circulation of dialysate and the encapsulation of microelectrodes; fabricating a dual FBG structure within the two fiber cores; and finally coupling the optical fibers to form a closed optical path. This invention addresses the bottleneck problem of existing fiber optic biosensors that rely on off-fiber sample pretreatment, enabling the integrated collection, separation, and detection of complex samples from living tissues, blood vessels, and other locations, thereby promoting the medical application of fiber optic in vivo / online biosensors.

The invention relates to a bending-resistant all-solid-state microstructure optical fiber. The bending-resistant all-solid-state microstructure optical fiber comprises a fiber core region and an inner cladding, the fiber core area comprises a first filling round hole, a first annular fiber core and a first groove ring; the first filling circular hole is located in the center of the fiber core area and has a first refractive index. The first annular fiber core wraps the first filling round hole and has a second refractive index; the first groove ring wraps the first annular fiber core and has a third refractive index; the inner cladding wraps the fiber core area and has a fourth refractive index; a plurality of second filling circular holes are distributed in the inner cladding, and the second filling circular holes have a fifth refractive index; the first refractive index is higher than the second refractive index; the second refractive index is higher than the fourth refractive index; the fourth refractive index is higher than the third refractive index; the third refractive index is higher than the fifth refractive index. According to the invention, the technical problem of poor bending resistance on the premise of large-mode-field transmission in the prior art can be solved.

The application discloses a hollow microstructure optical fiber with additive marks, a preform and a drawing detection method. The optical fiber comprises a cladding hollow sleeve and a plurality of anti-resonant microstructure units arranged and attached to the inner wall of the cladding hollow sleeve, and the anti-resonant microstructure units are used for forming an air core area with an inscribed circle size. The plurality of anti-resonant microstructure units are rotationally symmetrical. One or more additive mark units are arranged outside the core, so that the end face structure of the hollow microstructure optical fiber has asymmetry. The area of the additive mark unit accounts for 0.002% to 2% of the area of the cladding hollow sleeve. The hollow microstructure optical fiber with additive marks can mark and identify each anti-resonant microstructure unit in the drawing detection through the additive mark unit, judge the geometric uniformity of the hollow microstructure optical fiber, and provide reference and guidance for the production of the subsequent hollow microstructure optical fiber preform, and timely process adjustment and improvement.

This invention provides a disturbance feature extraction and pattern recognition method based on microstructured optical fiber sensing signals, belonging to the field of signal processing technology. By fusing the curvature and torsion statistical ratio features of the polarization-state Bonga sphere trajectory, the fractal dimension and gray-level co-occurrence matrix contrast-dissimilarity difference features of the time-frequency graph, and the correlation coefficient and mutual information features between the polarization and intensity domains, this invention significantly improves the distinguishability and recognition accuracy of different disturbance types, especially exhibiting stronger robustness against easily confused events such as periodic vibrations and sudden impacts. Simultaneously, the classification mechanism based on Mahalanobis distance and adaptive threshold discrimination enables the system to effectively reject unknown disturbance types, avoiding the high false alarm rate problem of traditional closed-set classifiers in open environments. Therefore, in practical applications, it balances recognition accuracy and generalization ability, and the entire feature extraction process does not involve complex iterations, meeting real-time processing requirements.

The present disclosure provides a kind of microstructure optical fiber preform and its manufacturing method, method includes the following steps: S101: with chemical vapor deposition torch to the target stick direction emit silica, to deposit preform loose body on target stick;S102: if the thickness of the preform loose body reaches the first specified value, while emitting high-purity quartz powder to the target stick direction with low-temperature plasma torch, continue to emit silica to the target stick direction with the chemical vapor deposition torch, to continue to deposit preform loose body on target stick;S103: if the thickness of the preform loose body reaches the second specified value, stop emitting high-purity quartz powder with the low-temperature plasma torch, but continue to emit silica to the target stick direction with the chemical vapor deposition torch, to continue to deposit preform loose body on target stick;S104: if the weight of the preform loose body reaches the third specified value, the preform loose body is treated at high temperature to form the microstructure optical fiber preform.

The application discloses a hollow microstructure optical fiber with subtractive marks, comprising a cladding hollow sleeve and a plurality of anti-resonant microstructure units arranged and attached to the inner wall of the cladding hollow sleeve, the anti-resonant microstructure units are used for forming an air core area with an inscribed circle size; the plurality of anti-resonant microstructure units are rotationally symmetrical; one or more subtractive mark units are arranged outside the core, so that the end face structure of the hollow microstructure optical fiber has asymmetry; the subtractive mark unit is a groove or a through hole, and the area of the subtractive mark unit accounts for 0.002% to 2% of the area of the cladding hollow sleeve. The hollow microstructure optical fiber with subtractive marks can mark and identify each anti-resonant microstructure unit in the drawing detection, judge the geometric uniformity of the hollow microstructure optical fiber, provide reference and guidance for the production of the hollow microstructure optical fiber, and timely process adjustment and improvement.

The invention provides a hollow-core microstructure optical fiber and a registration method and device thereof, and relates to the technical field of optical fibers. According to the hollow-core microstructure optical fiber, at least one registration groove extending in the axial direction of the optical fiber is formed in the outer wall of the sleeve wrapping layer of the hollow-core microstructure optical fiber, so that when the hollow-core microstructure optical fiber is welded or connected, accurate angle positioning is achieved through mechanical embedding of the registration groove and a limiting protrusion of an external clamping device, and the accuracy of the hollow-core microstructure optical fiber is improved. Axial deviation or angular rotation of the hollow-core microstructure optical fiber is effectively avoided, so that rapid, stable and repeatable accurate alignment is realized.

A method and system for monitoring non-destructive winding of a hollow-core microstructured optical fiber loop, relating to the technical field of fiber-optic gyroscopes. The method comprises the following steps: performing symmetrical winding on a hollow-core microstructured optical fiber by means of a winding device; subjecting the winding device to incidence of a light wave having a high extinction ratio, and collecting an emergent signal during emission; and performing waveform analysis on the emergent signal in real time during winding, so as to monitor the non-destructive winding.

This invention relates to an optical fiber probe, specifically an external indium tin oxide (ITO) double nanowire refractive index type MOF-SPR probe. The MOF-SPR probe consists of a microstructured optical fiber and two ITO nanowires. The cladding of the microstructured optical fiber has a central air hole and four symmetrically distributed elliptical air holes. D-shaped notches are located on both sides of the cladding. The two ITO nanowires are located on either side of the D-shaped notches, tangent to their midpoints. The core of the microstructured optical fiber is located above and below the central air hole and between the two elliptical air holes, forming a dual-core symmetrical microstructured optical fiber. The radius of the cladding is 16 μm; the radius of the central air hole is 0.8 μm; the radius of the ITO nanowires is 0.8 μm; and the distance from the midpoint of the D-shaped notch to the center of the cladding is 10.5 μm. This probe features a simple coating process, low loss, high sensitivity, and resistance to harsh environments.

The present invention belongs to the field of microstructured optical fiber technology, and discloses a high-birefringence solid-core polarization-maintaining microstructured optical fiber and its preparation method. The cross-section of the optical fiber provided by the present invention is circular, and the optical fiber includes, from the outside to the inside, a quartz cladding, a first air hole cladding, a second air hole cladding, and a core; the number of layers of the first air hole cladding is at least one; the multiple first air holes in each layer of the first air hole cladding are arranged in a hexagonal shape with the cross-section center of the optical fiber as the center; the second air hole cladding is composed of four second air holes and two third air holes, and are symmetrically distributed with the line connecting the centers of the third air holes as the axis; the diameter of the third air hole is larger than the diameter of the first air hole, and the diameter of the first air hole is larger than the diameter of the second air hole. The solid-core polarization-maintaining microstructured optical fiber provided by the present invention has high birefringence performance, good resistance to environmental changes, simple structure, and is easy to implement in process and mass production.

This application relates to the field of spectroscopic detection technology, specifically disclosing a method for fabricating a microstructure-enhanced optical fiber and a light collection system for a Raman spectrometer. The system includes: a light source assembly for generating laser light and collimating the laser light to irradiate a sample to be tested; a detection area assembly for placing and positioning the sample; a collection assembly for collecting Raman scattered light generated by the sample under laser irradiation based on the microstructure-enhanced optical fiber, wherein the fiber end face of the microstructure-enhanced optical fiber is provided with micro / nano structures, and the geometric parameters of the micro / nano structures are determined by a genetic algorithm for global optimization with the optimization objective of maximizing the coupling efficiency for unpolarized diffuse light within a preset wavelength range; and a control and analysis assembly for acquiring signals from the collected Raman scattered light and, based on the signal acquisition results, identifying the component information corresponding to the sample to be tested through a preset component identification model.

The invention relates to microstructured optical fibers that are drawn through hollow channels and have a core region, which extends along a fiber longitudinal axis, and a jacket region surrounding the core region. The aim of the invention is to reduce a damping increase due to corrosion and to reduce the emission of chlorine on the basis of the microstructured optical fibers. This is achieved in that at least some of the hollow channels are delimited by a wall material made of synthetic quartz glass which has a chlorine concentration of less than 300 wt. ppm and oxygen deficiency centers in a concentration of at least 2×1015 cm-3.

The utility model discloses an acid dissolution device for a microstructure optical fiber bundle, and belongs to the technical field of optical fiber preparation. Comprising a soaking device used for soaking the microstructure optical fiber bundle and a lifting device used for lifting and falling the microstructure optical fiber bundle. The soaking device is arranged below the lifting device and comprises a first soaking device, a second soaking device and a third soaking device which are movably arranged in parallel; the first soaking device, the second soaking device and the third soaking device are respectively filled with an acid soaking solution, a pure water soaking solution and an impregnating compound soaking solution; the lifting device comprises a hanging bracket, a fixed pulley arranged on the hanging bracket, a steel wire rope, a hook and a rope disc, one end of the steel wire rope is wound on the rope disc, and the other end bypasses the fixed pulley to be connected with the hook. The acid dissolution quality and the production efficiency can be improved, and the problem of high rejection rate caused by manual taking is effectively avoided.

A method of determining a dimensional parameter of a microstructured optical fiber (MOF), the method comprising: directing radiation toward the MOF; obtaining one or more signals associated with interference of radiation between structural elements of the MOF; determining a distance between structural elements of the MOF based on the one or more signals associated with interference of radiation between the structural elements; and determining the dimensional parameter based on the determined distance. A method for obtaining the MOF is also described.