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5 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.
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
Reducing photo-induced losses in optical fibers
An ultrashort supercontinuum light source includes a pump source and a supercontinuum generator configured to receive electromagnetic radiation from the pump source and generate supercontinuum radiation. The supercontinuum generator includes a nonlinear microstructured optical fiber having a core region comprising silica. The core region includes a dopant selected to reduce photo-induced non-bridging oxygen hole center losses in the nonlinear microstructured optical fiber.
Owner:NKT PHOTONICS AS
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
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