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10 results about "Microstructured optical fiber" patented technology
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Microstructured optical fibers (MOF) are optical fiber waveguides where guiding is obtained through manipulation of waveguide structure rather than its index of refraction. In conventional optical fibers, light is guided through the effect of total internal reflection. The guiding occurs within a core of refractive index higher than refractive index of the surrounding material (cladding). The index change is obtained through different doping of the core and the cladding or through the use of different materials. In microstructured fibers, a completely different approach is applied. Fiber is built of one material (usually silica) and light guiding is obtained through the presence of air holes in the area surrounding the solid core. The holes are often arranged in the regular pattern in two dimensional arrays, however other patterns of holes exist, including non-periodic ones. While periodic arrangement of the holes would justify the use of term "photonic crystal fiber", the term is reserved for those fibers where propagation occurs within a photonic defect or due to photonic bandgap effect. As such, photonic crystal fibers may be considered a subgroup of microstructured optical fibers.
Bending-resistant all-solid-state microstructure optical fiber
PendingCN121784890AImprove bending resistanceLarge mold field areaOptical fibre with multilayer core/claddingOptical waveguide light guideAll solid stateRefractive index
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.
Owner:QIANYUAN NATIONAL LABORATORY
Hollow microstructured optical fiber with additive markings, preform and drawing detection method
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.
Owner:YANGTZE OPTICAL FIBRE & CABLE CO LTD
Method for extracting perturbation characteristics and pattern recognition based on sensing signal of microstructured optical fiber
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.
Owner:NANJING HECHO TECH CO LTD
Hollow core microstructured optical fiber with subtractive index markings, preform, and draw detection method
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.
Owner:YANGTZE OPTICAL FIBRE & CABLE CO LTD
Method and system for monitoring non-destructive winding of hollow-core microstructured optical fiber loop
PCT designated stageWO2026031719A1Cladded optical fibreSagnac effect gyrometersWaveform analysisGyroscope
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.
Owner:CHINA STATE SHIPBUILDING CORP NO 707 RES INST
Method for manufacturing microstructured optical fiber and raman spectrometer light collection system thereof
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.
Owner:HANGZHOU INST FOR ADVANCED STUDY UCAS +1
Microstructured optical fiber and preform for same having specific oxygen deficiency center and chlorine concentrations
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.
Owner:HERAEUS QUARZGLAS GMBH & CO KG
Acid dissolution device for microstructure optical fiber bundle
ActiveCN224280099UControl risesControl falling speedGlass productionMicrostructure fiberAcid dissolution
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.
Owner:NANJING CHUNHUI SCI & TECH IND
Method for determining size parameters of microstructure optical fiber
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.
Owner:ASML NETHERLANDS BV +1