52results about "Microstructured optical fibre" patented technology

The invention discloses a few-mode hollow-core anti-resonance optical fiber based on a spiral cladding and a preparation method thereof. The optical fiber structure is sequentially divided into a hollow-core fiber core area, a cladding area and an outer sleeve area from inside to outside; the cladding area is formed by arranging a plurality of spiral anti-resonance structure units along the inner boundary of the outer sleeve area in the angular direction, each spiral anti-resonance structure unit is composed of spiral glass walls with the wall thickness of t, and the distance between the spiral glass walls changes along with the spiral generation direction or is kept at a specific constant. The high-order mode above a specific order is suppressed, and the suppression ratio of the high-order mode to the fundamental mode in the hollow-core optical fiber is regulated and controlled by changing the spiral type and structure parameters, so that the purpose of supporting low-loss transmission of a specific number of different-order modes is achieved. The multi-order mode low-loss transmission antenna has the characteristic of supporting multi-order mode low-loss transmission, can change a spiral line type structure and parameters according to different application scenes, is high in expansibility and feasible in preparation, and has a great application prospect in the application fields of communication, sensing, energy transmission and the like.

Provided are a reduced-diameter low-loss optical fiber and an optical cable. The reduced-diameter low-loss optical fiber includes a quartz layer, an adhesive layer, a first coating layer, and a second coating layer which are sequentially provided from inside to outside along a radial direction of the reduced-diameter low-loss optical fiber; where the adhesive layer is configured to increase an adhesive force between the first coating layer and the quartz layer; the first coating layer is configured to protect the quartz layer; and the second coating layer includes a second coating layer matrix and a plurality of reinforcing members, a base material of the second coating layer matrix is the same as that of the first coating layer, and the plurality of reinforcing members are distributed in the second coating layer matrix, so as to increase a strength of the reduced-diameter low-loss optical fiber.

The invention relates to the technical field of optical fiber sensing, in particular to an NHCPCF optical fiber seawater salinity sensor containing double microchannels and a preparation method and application of the NHCPCF optical fiber seawater salinity sensor. The sensor comprises a lead-in type single-mode optical fiber, a node-free hollow-core photonic crystal optical fiber and a lead-out type single-mode optical fiber which are sequentially welded; the node-free hollow-core photonic crystal fiber comprises a first cladding and a main air hole, silicon dioxide tubes are uniformly distributed in the main air hole, the tube wall of each silicon dioxide tube is tangent to the inner wall of the main air hole, and the axis of the main air hole is parallel to the axis of each silicon dioxide tube; the seawater salinity is measured by utilizing an anti-resonance reflection waveguide principle of NHCPCF and a specific micro-channel, a traditional processing mode of opening a large-area cavity in a cladding is not adopted, and the micro-channel is adopted, so that the integration can be improved, the breakage of an optical fiber is effectively avoided, and the mechanical strength in a test is enhanced; the sensor has high sensitivity (salinity sensitivity-0.88 nm / per mill) and good repeatability and stability.

A new class of optical fiber, the fabrication of preforms, and a new type of preform that, when drawn, yields an improved speckle-free output optical fiber, are presented. Useful fibers that achieve speckle-free, smooth output with flat-top transmission of light from Gaussian or few-mode sources are produced from the preforms introduced herein. The unique fabrication of these improved preforms is also presented. The preforms, and thus fibers produced with a variety of core dimensions from about 100 μm to over 1000 μm, are based on a structured silica section with a mode-mixing region adjacent to the inner core or, in the case of noncircular cores, within the core. A plasma vapor deposition process is tailored to achieve the structured section with a well-controlled morphology. The structured section is composed of a number of layer pairs, alternating thin down-doped layers with much thicker layers of core material. The ratio of the core layer thickness to the down-doped layer thickness is about 3 to 25. The number of paired layers is typically between about 8 and 30 layer pairs. The effective NA of the structured section depends on the details of the structured silica section and the individual down-doped layers. Both circular and non-circular inner core examples are possible and are discussed herein.

The application discloses a kind of photocatalytic optical fibers, including optical fiber core, photocatalytic layer, optical fiber cladding and light reflection film;The optical fiber core is hollow structure, and the optical fiber core outer periphery side is surrounded by optical fiber cladding;The interface of the optical fiber cladding and optical fiber core is coated with photocatalytic layer, and the outer surface of the optical fiber cladding away from optical fiber core is coated with light reflection film;The two ends of the optical fiber core are gas input end and light input end respectively, the gas can enter optical fiber core by gas input end, and can contact with photocatalytic layer and occur photocatalytic reduction reaction;The light can enter optical fiber core by light input end, and can be reflected by light reflection film;The optical fiber structure of the application can effectively enhance the utilization efficiency of light energy, increase the contact frequency of reactant and catalyst, thereby improve the reaction rate of photocatalytic reaction, and further improve the conversion efficiency of CO2.

The invention discloses a multi-channel low-crosstalk multi-layer stepped annular optical fiber and a design method thereof, and belongs to the field of optical communication, and the multi-layer stepped annular optical fiber comprises n (n is greater than or equal to 5 and less than or equal to 10) nested annular structure layers which are sequentially the first to nth annular structure layers from inside to outside; the refractive index of the outermost annular structure layer is smaller than or equal to that of silicon dioxide; the refractive indexes of the first to (n-3) th annular structure layers are greater than the refractive index of the outermost annular structure layer; the refractive index of the (n-2) th embedded structure layer is equal to that of the outermost annular structure layer; the refractive index of the (n-1) th annular structure layer is smaller than that of the outermost annular structure layer; the refractive indexes of the adjacent annular structure layers are different; the width range of the first annular structure layer to the (n-1) th annular structure layer is 1-6 [mu] m and is smaller than the width of the outermost annular structure layer. The number of orbital angular momentum modes which can be supported by the optical fiber and are good in effective refractive index separation can be increased, and therefore the optical communication capacity is improved.

The application discloses an azimuth angle marked hollow core optical fiber and a hollow core optical fiber end face detection method. The optical fiber comprises a cladding hollow core sleeve and a plurality of circumferentially uniformly arranged anti-resonant microstructure units arranged and attached to the inner wall of the cladding hollow core sleeve, and a hollow area surrounded by the anti-resonant microstructure units is a core; the azimuth angle of at least one anti-resonant microstructure unit is different from the azimuth angle of at least one other anti-resonant microstructure unit. The azimuth angle marked hollow core optical fiber and the hollow core optical fiber end face detection method provided by the application can quickly identify the anti-resonant microstructure units in the hollow core optical fiber under the premise that the complexity of the optical fiber preparation is not improved and the transmission performance of the optical fiber is almost not affected, and the geometric uniformity of the anti-resonant microstructure units can be conveniently controlled on line.

The invention provides a device and method for measuring and improving seed light coupling efficiency in a photonic crystal fiber, the device comprises a seed source, a seed light coupling module, a photonic crystal fiber, a pump light coupling module, a measuring module and an adjusting module, and the measuring module comprises a CCD camera and a power meter. The CCD camera is used for acquiring the amplified end face near-field light spot of the output end of the photonic crystal fiber in real time; the power meter is used for measuring the power of laser output by the photonic crystal fiber. The adjusting module determines the fiber core area power and the total power of the end face near-field light spots, calculates the core-to-package ratio, and adjusts the seed optical coupling module to adjust the core-to-package ratio to the maximum, so that the seed optical coupling efficiency in the photonic crystal fiber reaches the maximum. According to the invention, real-time imaging and analysis can be carried out on the light spot output by the optical fiber through the CCD camera, the coupling state is visually presented, and the measurement uncertainty caused by small hole positioning errors and alignment deviation is avoided, so that the effective coupling efficiency of seed light is accurately improved.

This invention discloses a mode filter, a few-mode fiber amplifier, and a multi-stage fiber amplifier system. The mode filter is fused to a polarization-maintaining ytterbium-doped few-mode fiber using a fiber fusion splicer. The cross-section of the mode filter includes: a core region with a core diameter smaller than that of the few-mode fiber; a cladding region surrounding the core region; two stress bars disposed on the cladding region and arranged symmetrically relative to the upper and lower axes of the core region; and Bragg gratings symmetrically distributed and etched along the edge of the core region, with the position of the Bragg gratings coinciding with the higher-order transverse mode portions transmitted within the core region. This invention uses a grating writing device to etch the Bragg grating structure around the core of the few-mode fiber, matching the target position of the grating on the fiber cross-section with the distribution of the higher-order transverse mode fields in the fiber. This results in greater loss of the higher-order modes in the fiber after passing through the grating, thus achieving the function of mode filtering.

The invention relates to the technical field of optics, in particular to a photon nanometer jet flow generator based on a concentric ring structure and a design method, and the photon nanometer jet flow generator comprises a medium substrate and a medium concentric ring structure arranged on the medium substrate; the medium concentric ring structure is formed by circular ring structures with different inner and outer radiuses distributed along a concentric circle. According to the PNJ generator based on the concentric ring structure, the concentric ring structure meeting the requirement can be designed as required for any optimization target. Moreover, the concentric ring structure provided by the invention is compatible with a micro-nano processing technology, is easy to process, has the advantage of on-chip integration, and shows huge application potential in the fields of ultrahigh-resolution optical imaging, nano particle control, ultra-sensitive biosensing, nanoscale photoetching, enhanced spectroscopy and the like.

An MCF according to the disclosure has a structure preventing deterioration in quality of optical transmission signals. The MCF comprises cores, a common cladding, and a coating. Any of the cores has a coating leakage loss of 0.01 dB / km or more at a wavelength within a wavelength range of from 850 nm to 1700 nm. The coating includes a leaked light propagation suppressive coating layer having a first optical property or a second optical property to light with a wavelength within a wavelength range of from 850 nm to 1700 nm or from 1260 nm to 1625 nm. The first optical property is defined by, as an attenuation index of the light, an absorbance per 1 µm thickness being 0.1 dB or more. The second optical property is defined by a product of absorbance per 1 µm thickness and a thickness being 0.1 dB or more.

This invention provides a fiber optic cable-readable preform with excellent mode mixing for achieving speckle-free output. [Solution] A preform is provided for drawing into a speckle-free output optical fiber, wherein the cross-sectional structure of the preform comprises a circular inner core having a refractive index or refractive index profile, surrounded by a structured circular region having an average refractive index lower than the average refractive index of the inner core, and the preform can be drawn into a speckle-free optical fiber using standard fiber drawing techniques.

This application provides a method for constructing a dual-core hollow anti-resonant optical fiber and a polarization beam splitter. The optical fiber includes an inner cladding assembly and an outer cladding tube surrounding the inner cladding assembly. The inner cladding assembly includes two parallel elliptical tubes and two first circular tube assemblies arranged in a non-contact manner, with a second circular tube assembly inside each elliptical tube. Each elliptical tube and each first circular tube assembly is tangent to the outer cladding tube. The cross-sections of the two elliptical tubes are mirror-symmetrical about the Y-axis, and the major axes of both elliptical tubes extend along the X-axis to divide the interior of the outer cladding tube into two symmetrical core regions. This application can effectively shorten the distance between the two symmetrical cores of the dual-core hollow anti-resonant optical fiber, thereby effectively reducing the overall length of the dual-core hollow anti-resonant optical fiber polarization beam splitter, achieving ultra-wide operating bandwidth and good single-mode operation characteristics, and improving the applicability of the polarization beam splitter.

The application discloses a kind of integrated microfluidic biological sensing chip based on micro column array D type optical fiber, belong to biological detection field.This integrated microfluidic biological sensing chip based on micro column array D type optical fiber includes fiber base micro column array D type sensing optical fiber;Periodic micro column array is arranged on the side edge polishing surface of fiber base micro column array D type sensing optical fiber;Micro column array surface is successively coated with sensitizing layer and specific modification layer;The raw material of sensitizing layer includes sensitizing material, and sensitizing material includes MXene material and / or metal nano material, and the raw material of specific modification layer includes biological aptamer material.Micro column array structure can be used as cell capture enhancement interface, forms a large number of capture sites, increases the contact area of cell and chip surface, improves cell capture efficiency.Sensitizing layer can greatly enhance the evanescent field intensity of optical fiber, and biological aptamer material realizes specific identification, and also has good sensitivity and detection accuracy to very low concentration circulating tumor cell.

A MCF according to the present disclosure has a structure that prevents quality deterioration of an optical transmission signal. The MCF includes cores, a common cladding layer, and a coating. Any of the cores has a coating leakage loss of 0.01 dB / km or more at a wavelength in a wavelength range of 850 nm to 1700 nm. The coating includes a leak light propagation suppressing cladding layer having a first optical property or a second optical property with respect to light in a wavelength range of 850 nm to 1700 nm or 1260 nm to 1625 nm. The first optical property is defined by an absorbance per 1 μm thickness as an attenuation index with respect to light of 0.1 dB or more. The second optical property is defined by a product of an absorbance per 1 μm thickness and a thickness of 0.1 dB or more.

A terminator for an optical fibre cable including at least one microstructured optical fibre comprises: a hollow terminating member with a closed end and an opposite open end configured for cooperation with a severed end of an optical fibre cable; and a tubular collar having a first end into which the open end of the terminating member is received in a sealed manner, and an opposite second end to receive the severed end of the optical fibre cable for cooperation with the open end of the terminating member, the second end having an internal diameter which is reducible to seal the tubular collar around the optical fibre cable.

The invention discloses an adiabatic low-loss vortex structure optical multiplexing and demultiplexing device and an optical communication system, and belongs to the field of optical communication, and the optical multiplexing and demultiplexing device comprises a plurality of optical fiber vortex mode selection couplers with different orders, which are respectively used for exciting vortex mode groups with different orders; the optical fiber vortex mode selection coupler is formed by parallel fused biconical taper of a multimode optical fiber with a transition cladding and a single-mode optical fiber subjected to pre-tapering, the multimode optical fiber and the single-mode optical fiber form a directional coupling structure, and a fundamental mode in the single-mode optical fiber is matched with a vortex mode group in the multimode optical fiber in phase; the multimode optical fiber with the transition claddings comprises a fiber core and a plurality of transition claddings, the width of each layer is gradually increased from the fiber core to the outermost transition cladding, and the refractive index difference between every two adjacent layers is gradually decreased; and a plurality of optical fiber vortex mode selection couplers with different orders are cascaded to form a multi-stage multiplexing and demultiplexing structure. The heat insulation loss of the optical fiber mode selection coupler can be reduced, so that the optical fiber mode selection coupler supports more vortex mode numbers.

The invention discloses a submicron-diameter ice micro-nano optical fiber and a preparation device and method thereof. The initial ice micro-nano optical fiber is clamped and fixed by an optical fiber clamping object and is in a suspended state; the infrared light source is connected with the silica optical fiber taper, and the silica optical fiber taper is arranged in the direction perpendicular to the axial direction of the initial ice micro-nano optical fiber and conducts scanning movement in the axial direction; based on the strong absorption characteristic of ice in an infrared band, infrared light energy is conducted through a quartz optical fiber taper, light intensity and scanning speed are regulated and controlled, local heating of a specific area of an initial ice micro-nano optical fiber is achieved, the ice micro-nano optical fiber is promoted to generate a controllable gasification sublimation process, and therefore the ice optical fiber is manufactured by reducing the diameter of the ice optical fiber to the submicron scale. The method is simple in process and high in regulation and control precision, the submicron-diameter ice micro-nanofiber which is difficult to implement in the past can be stably prepared, and the prepared submicron-diameter ice micro-nanofiber is smooth in surface, good in diameter uniformity and adjustable in diameter and uniform region length and has excellent mechanical performance and low-loss single-mode wave guiding capacity.

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.

The invention relates to the technical field of fiber bragg gratings, in particular to a preparation method of a single-mode sapphire photonic crystal fiber bragg grating. In order to solve the problem that stable single-mode transmission in a high-temperature environment is difficult to realize by adopting the sapphire fiber bragg grating prepared by adopting an existing sapphire fiber bragg grating preparation method, the invention provides a novel preparation method of the single-mode sapphire photonic crystal fiber bragg grating, which is realized by constructing a three-dimensional photonic crystal cladding in a sapphire fiber. The photonic crystal cladding structure is directly constructed in the sapphire optical fiber, so that the single-mode transmission characteristic is realized, and meanwhile, the problems of stripping, cracking or failure caused by thermal expansion mismatch of a traditional outer cladding under a high-temperature condition are solved.

The invention belongs to the technical field of fiber laser, and particularly discloses a non-linear effect limitation-free high-beam-quality fiber laser amplifier, which comprises a seed light source for generating seed signal light with a preset central wavelength; the pre-amplification stage is used for performing first-stage power amplification on the seed signal light; the main power amplification stage is used for performing second-stage high-power amplification on the pre-amplified signal light; the output and transmission stage is used for carrying out output and long-distance transmission on the signal light subjected to main power amplification; wherein the main power amplification stage comprises an active hollow-core anti-resonance optical fiber and a pumping coupler used for injecting pumping light into the active hollow-core anti-resonance optical fiber, and the active hollow-core anti-resonance optical fiber is a multi-ring hollow anti-resonance optical fiber internally provided with a multi-ring structure. According to the invention, the non-linear problem of a high-power laser amplifier is fundamentally solved while high beam quality output of the laser amplifier is maintained.

An optical fibre system comprises an optical fibre cable comprising at least one microstructured optical fibre within a jacket; and a barrier mechanism responsive to a breach of the optical fibre cable through which water from a surrounding environment of the optical fibre cable may enter voids of the microstructured optical fibre; wherein the barrier mechanism is responsive to the breach by operating to introduce a barrier across the voids of the microstructured optical fibre, the barrier configured to inhibit movement of water along the voids.

A plastic optical fiber including a first cladding; a first core forming a first sea portion inside the first cladding; and a first island portion formed inside the first core with at least an outer periphery having a lower refractive index than the first sea portion, wherein the first core includes a polymethyl methacrylate-based resin.

The invention relates to a high-performance hollow-core anti-resonance optical fiber 3dB beam splitter and a beam splitting method thereof.The 3dB beam splitter comprises a cladding area and a fiber core area, the cladding area is of an anti-resonance structure formed by arranging a plurality of cylindrical quartz glass tubes in a symmetrical mode, transmission of light energy in a fiber core can be effectively limited, and leakage loss can be reduced; the fiber core area is arranged in the cladding area, comprises a first fiber core and a second fiber core and serves as an optical signal transmission channel. When an optical signal enters, the cladding area enables the optical signal to generate X and Y polarized light and to be periodically coupled between fiber cores, the coupling length ratio meets the condition by designing the arrangement of the glass tubes, and polarization-independent 50: 50 beam splitting is achieved. According to the invention, a short beam splitting length and a large bandwidth working range are realized, and a 200nm communication wave band is covered; polarization-independent power beam splitting is accurately realized; the cladding region is simple in structure, high in preparation feasibility and wide in application prospect in the field of optical communication.

To provide an antiresonance element preform capable of easily and reproducibly manufacturing an antiresonance hollow core fiber having a good optical characteristic, for example, low optical attenuation.SOLUTION: An antiresonance element preform (100) for manufacturing an antiresonance hollow core fiber comprises a first circular element (200) having a first circle radius (250), and a first arc-like element (300) having a first arc radius (350) on an axial top view. Furthermore, the present invention relates to a method for manufacturing an antiresonance preform, a preform for manufacturing an antiresonance hollow core fiber having at least one antiresonance element preform, and an antiresonance hollow core fiber. According to the present invention, the first circular element (200) and the first arc-like element (300) are connected to each other with two contact points (400).SELECTED DRAWING: Figure 1

A method of making a transverse Anderson localization (TAL) element includes mixing pellets together to make a mixture, the pellets being of two or more distinct materials having respective wave speeds effective to provide Anderson guiding. The mixture is fused to make a preform which has respective pellet-size areas of the distinct materials corresponding to the pellets in the mixture. One or more stretching operations is performed to stretch the preform into the TAL element.

The present application provides a reduced-diameter low-loss optical fiber and an optical cable. The reduced-diameter low-loss optical fiber includes a quartz layer, an adhesive layer, a first coating layer, and a second coating layer which are sequentially provided from inside to outside along a radial direction of the reduced-diameter low-loss optical fiber; where the adhesive layer is configured to increase an adhesive force between the first coating layer and the quartz layer; the first coating layer is configured to protect the quartz layer; and the second coating layer includes a second coating layer matrix and a plurality of reinforcing members, a base material of the second coating layer matrix is the same as that of the first coating layer, and the plurality of reinforcing members are distributed in the second coating layer matrix, so as to increase a strength of the reduced-diameter low-loss optical fiber. In the reduced-diameter low-loss optical fiber provided by the present application, the strength of the reduced-diameter low-loss optical fiber is relatively large, and the adhesive force between the coating layer and the quartz layer in the reduced-diameter low-loss optical fiber is relatively strong.

The application discloses a method for sub-region weaving and beam uniformity adjustment of an optical fiber bundle. For a branch optical fiber bundle, sub-regions of a light source (or an incident end cross section) can be divided and a plurality of micro-regions can be further divided in the sub-regions according to the beam quality of the used light source, the diameter of the optical fiber, the number of branches and the required homogenization degree. Each micro-region is composed of a small bundle of optical fibers. The size and number of the micro-regions are adjusted to realize the purpose of adjustable beam uniformity. The application is suitable for one-to-many and many-to-many optical fiber bundle manufacturing and has wide applicability and technical value. The method not only improves the beam uniformity of the optical fiber bundle, but also enhances the mechanical strength and stability of the optical fiber bundle, and meets the requirements of different fields on the beam uniformity of the optical fiber bundle.

The invention relates to an anti-resonance ele-ment preform for producing an anti-resonant hollow-core fiber, in an axial top view comprising a circular first cir-cle element with a first circle radius and a circular arc-shaped first circular arc element with a first circular arc radius. Furthermore, the invention relates to a method for producing an anti resonance element preform, a preform for producing an anti-resonant hollow-core fiber comprising at least one anti-resonance element preform and an anti-resonant hol-low-core fiber. According to the invention, it is provided that the first circle element and the first circular arc element are connected to one another at two contact points.

The optical fiber system includes an optical fiber cable including at least one microstructured optical fiber within a jacket, and a barrier mechanism responsive to a breach in the optical fiber cable through which water from the environment surrounding the optical fiber cable can enter a void in the microstructured optical fiber, the barrier mechanism responsive to the breach by operating to provide a barrier across the void in the microstructured optical fiber, the barrier configured to inhibit movement of water along the void.