597results about "Optical fibre with multilayer core/cladding" patented technology

The invention provides a low-loss hollow-core optical fiber and a preparation method thereof. The hollow-core optical fiber comprises an outer cladding, and a plurality of anti-resonance units and a plurality of cladding supplementing units which are connected to the inner wall of the outer cladding, the anti-resonance units are evenly distributed along the inner wall of the outer cladding at equal intervals, the cladding supplement units are arranged between the adjacent anti-resonance units, and the anti-resonance units surround to form a fiber core area in the outer cladding. The anti-resonance unit comprises an outer anti-resonance tube, a first inner anti-resonance tube, a second inner anti-resonance tube and a substrate; the opening of the substrate faces the center of the outer cladding layer and is tightly attached to the inner wall of the outer cladding layer; the cross sections of the outer anti-resonance tube and the first inner anti-resonance tube are arc-shaped, the openings face the substrate, and the two ends are connected to the two ends of the substrate; the second internal anti-resonance tube is connected to the inner wall of the substrate; the cladding supplementing unit is of a circular or arc-shaped structure. In the drawing process of the optical fiber, the anti-resonance unit of the hollow-core optical fiber has good structural stability.

The invention discloses a flexible force-induced luminescence microstructure optical waveguide and a preparation method thereof. The flexible mechanoluminescence microstructure optical waveguide comprises an inner-layer fiber core, n mechanoluminescence composite blocks tightly attached to the inner-layer fiber core, a wrapping layer wrapping the inner-layer fiber core and the n mechanoluminescence composite blocks, and a protection layer coating the surface of the wrapping layer. The n mechanoluminescence composite blocks generate fluorescence signals with different colors under the action of external stress, the fluorescence signals are collected through the inner-layer fiber core and the cladding of the optical waveguide and are transmitted to a far end along the inner-layer fiber core to be detected and demodulated, the sensing section corresponding to stress is determined through the demodulated color, and the corresponding stress is determined through the luminous intensity. The composite material is good in biocompatibility, integrates sensing and transmission functions, and can be used in human body wearable equipment. According to the preparation method, different structures can be prepared in the optical waveguide layer by layer in a mode of customizing different molds, and different purposes are met by integrating different materials.

The invention relates to the technical field of special optical fibers, in particular to a polarization-maintaining hollow-core anti-resonance optical fiber which comprises an outer cladding, an inner cladding, a fiber core, a first-class anti-resonance unit and a second-class anti-resonance unit. The inner cladding is arranged in the outer cladding, and the fiber core, the first-class anti-resonance unit and the second-class anti-resonance unit are arranged in the inner cladding; the first-class anti-resonance unit does not comprise a coupling thin wall, the second-class anti-resonance unit is provided with a coupling thin wall close to the fiber core side, and the coupling thin walls are two thin walls which are extremely close to each other and are not in contact with each other. According to the invention, high birefringence and broadband low transmission loss can be realized at the same time.

A multicore optical fiber (MCF) according to one embodiment of the present invention enables stable core identification. The MCF comprises a glass optical fiber and a resin coating. The glass optical fiber includes a plurality of cores, a marker, and cladding. On a cross-section of the MCF, the arrangement of the centers of the cores and the center of the marker has no rotational symmetry with respect to the center of the cross-section. The cladding includes an inner cladding that surrounds the cores and the marker, and an outer cladding that is provided on the outer peripheral surface of the inner cladding and has a refractive index higher than that of the inner cladding.

The invention discloses a multi-core all-solid-state anti-resonance optical fiber and a multi-wavelength optical fiber laser system. The multi-core all-solid-state anti-resonance optical fiber comprises an inner cladding area, at least two fiber core structures arranged in the inner cladding area and an outer cladding area or a coating layer area arranged on the periphery of the inner cladding area. Each fiber core structure comprises a fiber core area and an anti-resonance area, the anti-resonance area is composed of at least one capillary tube group, each capillary tube group comprises a plurality of capillary tubes, and the capillary tubes in each capillary tube group are annularly arranged on the periphery of the fiber core area by taking the fiber core area as the center; the optical fiber matrixes filled in the capillaries in the anti-resonance area are the same, and the refractive index of the anti-resonance area is n3gt; the refractive index n2 of the inner cladding region is equal to the refractive index n1gt of the fiber core region; and the refractive index of the outer cladding region or the coating layer region is n4. The optical fiber provided by the invention is beneficial to high-density integration of a fiber core structure in a multi-core optical fiber, has a large mode field area and a high-order mode rejection ratio, and gives consideration to both high power and high light beam quality.

The invention belongs to the technical field of optical fiber manufacturing, and discloses a self-marking type anti-resonance hollow-core optical fiber and a preparation method thereof. The self-marking type anti-resonance hollow-core optical fiber comprises a cladding sleeve, a cladding anti-resonance group and a self-marking unit, the cladding anti-resonance group is fixed on the inner wall of the cladding sleeve; the self-marking unit is positioned in the cladding sleeve, so that at least one cladding anti-resonance group is distinguished from other cladding anti-resonance groups; and a central region defined by the cladding anti-resonance group is a fiber core. According to the self-marking type anti-resonance hollow-core optical fiber, the cladding anti-resonance group in the anti-resonance hollow-core optical fiber can be quickly identified in the wire drawing process, the size of the cladding anti-resonance group can be conveniently regulated and controlled on line, and the transmission performance of the anti-resonance hollow-core optical fiber is not influenced.

The invention discloses a heterogeneous three-core anti-resonance optical fiber for transmission from visible light to intermediate infrared light, and belongs to the technical field of optical fiber communication. The heterogeneous three-core anti-resonance optical fiber comprises an outer cladding layer from outside to inside along the diameter of the optical fiber, a first inner cladding layer, a second inner cladding layer and a third inner cladding layer are arranged in the outer cladding layer, and a plurality of nesting pipe assemblies with the same structure are arranged in the first inner cladding layer, the second inner cladding layer and the third inner cladding layer at equal intervals in the circumferential direction. An upper air fiber core area, a lower left hollow fiber core area and a lower right air fiber core area are defined by the nesting pipe assembly. The upper air fiber core area, the lower left air fiber core area and the lower right air fiber core area respectively work in a 4m wave band, a 2m wave band and a 1m wave band, have extremely low limiting loss in the three working wave bands, and have good bending resistance performance at the same time.

The invention relates to a low-loss hollow-core optical fiber and application, the low-loss hollow-core optical fiber comprises an outer cladding and an inner cladding, the inner cladding is composed of anti-resonance structure units, the anti-resonance structure units are arranged in the circumferential direction of the inner wall of the outer cladding and are connected with the inner wall of the outer cladding, a fiber core is formed by a central cavity wrapped by the inner cladding, and the fiber core is connected with the inner cladding. The filter is characterized in that each anti-resonance structure unit comprises four or more than four layers of circular anti-resonance tubes with different radiuses, and an outer anti-resonance tube of each anti-resonance structure unit is tangent to the inner wall of the outer cladding; every two adjacent circular anti-resonance tubes are tangent in sequence, and the positions of all tangent points are alternately switched from outside to inside on the side away from the geometric center of the fiber core and on the side close to the geometric center of the fiber core. In the structure of the optical fiber, transmitted light is effectively limited in the fiber core for low-loss transmission by the multi-layer anti-resonance glass layer and the air area contained in the inner cladding; the number of reflecting surfaces in the inner cladding layer is increased by arranging the four layers of glass nested tubes, and the loss of the hollow-core optical fiber is reduced.

An optical fiber or a preform from which the fiber may be drawn may include an outer cladding layer, an inner cladding layer, a first core, and a second core. Each core may be in contact with at least the inner cladding layer and under frozen-in compressive axial stress. The refractive index of the inner cladding layer may be less than the refractive index of the outer cladding layer.

The invention provides a small-diameter low-loss optical fiber, and relates to the technical field of optical communication. The small-diameter low-loss optical fiber comprises a core layer, and the value range of the relative refractive index difference delta n1 of the core layer is 0.35%-0.65%. The wrapping layer wraps the outer side of the core layer; wherein the cladding comprises a first platform layer wrapping the core layer, the relative refractive index difference of the first platform layer is # imgabs0 #, r1 is the radius of the core layer, r2 is the radius of the first platform layer, delta n2 is the relative refractive index difference of the inner surface of the first platform layer, and delta n3 is the relative refractive index difference of the outer surface of the first platform layer; the first platform layer is wrapped with the sunken layer, and the numerical value range of the relative refractive index difference delta n4 of the sunken layer is-0.4%-0.6%. According to the small-diameter low-loss optical fiber provided by the invention, the strength of the optical fiber is remarkably improved and the overall performance of the optical fiber is optimized under the condition that the small size is maintained.

Disclosed in the present invention is a radiation-insensitive single-mode optical fiber, comprising a core, a first cladding, and a second cladding which are sequentially arranged from inside to outside, or comprising a core, a first buffer layer, a first cladding, a second buffer layer, and a second cladding which are sequentially arranged from inside to outside. The core, the first buffer layer, the first cladding, the second buffer layer, and the second cladding are all made of quartz glass doped with a cerium element, an aluminum element, and a fluorine element. The contents of the cerium element, the aluminum element, and the fluorine element are constant in the radial directions of the core, the first cladding, and the second cladding, respectively, and linearly vary in the first buffer layer and the second buffer layer, respectively. In the present invention, by regulating and controlling the contents of the cerium element, the aluminum element, and the fluorine element in the core, the first cladding, and the second cladding of the optical fiber, the stress distribution of the optical fiber is optimized, the residual stress is reduced, and the generation of fatigue bonds and wire drawing defects in the optical fiber is reduced, thereby improving the radiation resistance of the optical fiber.

The invention belongs to the technical field of hollow-core anti-resonance optical fiber polarization filters, and relates to a hollow-core anti-resonance optical fiber polarization filter based on the SPR effect, an optical fiber comprises six cladding tubes, the six cladding tubes are arranged in a circumferential array, and the circumscribed circle parts of the six cladding tubes are fiber cores; a nesting tube is eccentrically arranged in each cladding tube, the nesting tube is internally tangent to the cladding tube, and the tangent point is the farthest distance from the center of the fiber core; one-third arc sections, close to the fiber core, of the inner walls of the two cladding tubes in the y-axis direction are coated with gold films; six cladding tubes of the optical fiber are tangent to the inner wall of the outer supporting tube. The outermost layer is arranged to be a perfect matching layer and connected with the outer supporting pipe. The hollow-core anti-resonance optical fiber polarization filter based on the SPR effect has the advantages of being simple in process, better in filter performance, easy to control structural parameters and the like.

The embodiment of the invention provides an anti-bending optical fiber and a production process thereof, and relates to the technical field of optical fibers. The first wrapping layer wraps the core layer; the gradient layer wraps the first wrapping layer; the second wrapping layer wraps the gradient layer; and the refractive indexes of the core layer, the first cladding, the gradient layer and the second cladding are gradually reduced in sequence. According to the bending-resistant optical fiber and the production process thereof provided by the embodiment of the invention, the problem of relatively large bending loss of the optical fiber in the prior art is solved.

The invention discloses a large-mode-field active optical fiber convenient to prepare. The optical fiber comprises an active fiber core region and a cladding region, luminescent rare earth ions are doped in the active fiber core area; the cladding area comprises an inner cladding area and an outer cladding area, and the inner cladding area is composed of a passive background material area and double-layer nested capillary tubes which are distributed around the active fiber core area and meet the thickness of the anti-resonance condition; the double-layer nested capillary tube comprises an inner-layer capillary tube and an outer-layer capillary tube, and the distance between the outer wall of the inner-layer capillary tube and the inner wall of the outer-layer capillary tube meets the resonance condition of an LP11 mode in an active fiber core area; the outer cladding area surrounds the inner cladding area, and pump light is limited to be transmitted in the inner cladding area and the fiber core area. The refractive index difference value between the fiber core area and the background area is increased, optical fiber preparation is facilitated, and laser mode characteristic degradation caused by active fiber core area thermally-induced refractive index change under the high-power condition is effectively restrained.

The invention relates to a low-loss hollow-core optical fiber with different cladding nested anti-resonance tube wall thicknesses and application, the low-loss hollow-core optical fiber comprises an outer cladding and an inner cladding, the inner cladding is composed of anti-resonance structure units, the anti-resonance structure units are arranged along the circumferential direction of the inner wall of the outer cladding and are connected with the inner wall of the outer cladding, and the anti-resonance structure units are connected with the inner wall of the outer cladding. The optical fiber is characterized in that the anti-resonance structure unit comprises at least two layers of anti-resonance tubes with different radiuses and different thicknesses, and the thicknesses of the anti-resonance tubes are sequentially increased from outside to inside. According to the invention, by setting the relationship that the thicknesses of the anti-resonance tubes are gradually increased from outside to inside, the low-loss light guide characteristic of the hollow-core optical fiber is maintained, the influence on the low-loss bandwidth range is small, the tolerance of the hollow-core optical fiber to the manufacturing tolerance is finally effectively improved, and the manufacturing difficulty of the hollow-core optical fiber is reduced.

A polarization-maintaining fiber may include a core region having a radius R1, a trench region having an inner radius R2 and an outer radius R3, and a fiber radius R4, and two stress regions symmetrically located in an annular region having an inside radius R5 and an outside radius R6. The inner radius R2 of the trench region may be less than or equal to the inside radius R5 of the annular region.

The invention provides a heterogeneous dual-core optical fiber SPR (Surface Plasmon Resonance) microfluidic chip system for biochemical detection. The system is characterized by comprising a heterogeneous dual-core optical fiber 1, a dual-core optical fiber movable connector 2, a dual-core optical fiber SPR probe 3, a microfluidic chip 4, a dual-core optical fiber fan-in and fan-out device 5, a double-clad optical fiber 6, a large-core-diameter optical fiber 7, a spectrograph 8, a light source 9 and the like, wherein the double-core optical fiber 1 comprises a middle single-mode fiber core and a biased multi-mode fiber core, the end face of the single-mode fiber core is subjected to inclined grinding and plated with a gold film for exciting the surface plasma resonance effect, the end face of the multi-mode fiber core collects SPR reflected light signals through a secondary reflection inclined plane, and the double-core optical fiber SPR probe 3 is embedded into the micro-flow chip 4. The device has the advantages of high sensitivity, low loss and multi-channel detection, and can be widely applied to the fields of biochemical detection, environmental monitoring, precision medical treatment and the like.

The present application provides a low-loss single-mode optical fiber, which relates to the technical field of communication optical fibers and is used for solving a technical problem of high attenuation of single-mode optical fibers. The low-loss single-mode optical fiber comprises a core layer and a cladding layer surrounding the core layer, wherein the core layer comprises an inner core layer and an outer core layer, the inner core layer is doped with P and GeO2, and the outer core layer is doped with F, P and GeO2. By adjusting the elements doped in the inner core layer and the outer core layer, Rayleigh scattering and the attenuation coefficient of the optical fiber are reduced, so the optical fiber has lower attenuation loss and a better bending resistance property on the premise that all properties of the optical fiber are compatible with international standards.

The invention discloses a low-loss spiral hollow-core anti-resonance optical fiber design. The structure of the optical fiber is divided into a hollow-core fiber core area, a cladding area and an outer sleeve area in sequence from inside to outside; the cladding area is formed by arranging a plurality of spiral anti-resonance structure units in the angular direction along the inner boundary of the outer sleeve area, each spiral anti-resonance structure unit is composed of a spiral glass wall with the wall thickness t, and on one hand, the spiral glass walls can provide multiple effective glass anti-resonance layers under the condition that additional nodes are not introduced; and the limiting loss of the optical fiber can be greatly reduced. According to the invention, multiple anti-resonance layers are introduced without introducing additional nodes, so that low-loss transmission can be realized, and meanwhile, the waveguide performance optimization potential is very high, and the waveguide has a very great application prospect in the application fields of communication, sensing, energy transmission and the like.

The invention discloses an ultra-wideband heterogeneous five-core anti-resonance optical fiber for transmission from ultraviolet to intermediate infrared, and belongs to the technical field of optical fiber communication. The heterogeneous five-core anti-resonance optical fiber sequentially comprises a perfect matching layer, an outer cladding layer, a first light guide unit, a second light guide unit, a third light guide unit, a fourth light guide unit and a fifth light guide unit from outside to inside along the fiber diameter, wherein the first light guide unit, the second light guide unit, the third light guide unit, the fourth light guide unit and the fifth light guide unit are arranged in the outer cladding layer. A plurality of nesting tube assemblies and gap tube assemblies with the same or different structures are arranged in each light guide unit in the circumferential direction at equal intervals, and a central air fiber core area, a left upper air fiber core area, a right lower air fiber core area, a right upper air fiber core area and a left lower air fiber core area are defined by the assemblies and work at the wave bands of 0.15-2.0 m, 2.0-3.0 m, 3.0-4.0 m, 4.0-6.0 m and 6.0-7.0 m correspondingly. And all the components show extremely low restrictive loss, dispersion close to zero and a relatively low nonlinear coefficient.

This multicore fiber (100) comprises: a plurality of center core parts (111, 112); a plurality of low refractive index layers (131, 132) that surround the outer circumference of each of the center core parts; and a cladding part (140) that surrounds the plurality of low refractive index layers. The maximum refractive index of the center core parts is higher than the average refractive index of the cladding part. The minimum refractive index of the low refractive index layers is lower than the average refractive index of the cladding part. Among the plurality of center core parts, the absolute value of the difference in the relative refractive index difference of the maximum refractive index of the center core parts with respect to the average refractive index of the cladding part, and the absolute value of the difference in the center core diameters are 10% or less. In two low refractive index layers among the plurality of low refractive index layers, the absolute value of the difference in the relative refractive index of the minimum refractive index of the low refractive index layers with respect to the average refractive index of the cladding part, or the absolute value of the difference in the ratio of the outer diameters of the low refractive index layers with respect to the center core diameters is 10% or more.

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.

The utility model discloses a light source module and a projection display device. The light source module comprises a laser light source; the coupling lens is arranged on an emergent light path of the laser light source, and the light incident side and / or the light emergent side of the coupling lens are / is provided with an aperture diaphragm; the tail fiber is arranged on an emergent light path of the coupling lens, light emitted by the laser light source is coupled into the tail fiber through the coupling lens, the tail fiber is a single-mode optical fiber, the optical fiber coupling end face of the tail fiber is an inclined end face, and the inclination angle of the inclined end face is larger than 8 degrees. Echoes and stray light generated at the optical fiber coupling end face are reduced, the influence of the echoes and stray light on the output of the laser is weakened and avoided, and the imaging quality is improved.

Various embodiments may relate to a method of forming a semiconductor fiber. The method may include determining, via a computer, a suitable combination of a fiber core material and a cladding material. The method may also include providing the fiber core material into an inner cavity of a tube, the tube including the cladding material, to form a composite structure. The method may further include subjecting the composite structure to a thermal drawing process at a draw temperature higher than a melting point of the fiber core material to form the semiconductor fiber including a core including the fiber core material, and a cladding around the core, the cladding including the cladding material.

The invention relates to a broadband bending-resistant multimode optical fiber and a preparation method thereof, the refractive index profile of a core layer is in a gradually-changed parabola shape, the distribution index alpha is 1.95-2.65, the radius R1 of the core layer is 12-35 microns, the delta 1max is 0.9%-1.4%, the relative refractive index difference delta 1min at the R1 position of the edge of the core layer is-0.16%--0.06%, cladding layers comprise an inner cladding layer, a first sunken cladding layer, a second sunken cladding layer and an outer cladding layer from inside to outside in sequence, the inner cladding layer is sequentially provided with a first inner cladding layer and a second inner cladding layer from inside to outside, the single-side width (R4-R3) of the first sunken cladding layer is 1.5-9.0 [mu] m, delta 4 is-1.1%--0.60%, the single-side width (R5-R4) of the second sunken cladding layer is 1.0-3.0 [mu] m, delta 5 is-1.0%--0.55%, the radius R6 of the outer cladding layer is 60-65 [mu] m, and delta 6 is-0.12-0.12%. The core cladding is reasonable in structural design, has the excellent characteristics of high bandwidth, strong bending resistance and low attenuation, and is high in transmission efficiency and excellent in long-term stability and reliability.

The invention discloses an optical emission chip, an optical fiber and an optical signal transmission system, and belongs to the field of optical transmission. A light beam emitted by an emission laser can be divided into a first sub-light beam and a second sub-light beam through a first beam splitter; on one hand, the light field mode of the first sub-light beam is converted into a high-order mode and local oscillation light is obtained (so that the local oscillation light can be coupled to a coating layer of the optical fiber for transmission), and on the other hand, information to be transmitted is coupled to the second sub-light beam and signal light is obtained, so that the signal light is coupled to a fiber core of the optical fiber for transmission. And finally, the local oscillation light and the signal light are combined into a light beam to be transmitted by a first beam combiner, so that the light beam to be transmitted is transmitted to a receiving end through different layers of the optical fiber. On one hand, a receiving end does not need to be provided with a laser for generating local oscillation light, on the other hand, local oscillation light and signal light can be transmitted through a single optical fiber, and cost and hardware complexity of an optical transmission system can be reduced at the same time.

A method of forming a crystalline core / crystalline clad (C4) optical fiber. The method comprises coextruding a cladding mixture of a plasticizer and a binder with a yttrium aluminum garnet (YAG) core. The coextrusion dynamically clads a polycrystalline cladding onto the YAG core to yield a green C4 optical fiber. The C4 optical fiber is then densified, preferably in two steps sintering and hot isostatic pressing. The resulting optical C4 fiber has greater power capacity than a glass fiber labor host.

The utility model discloses a light source module and a projection display device. The light source module comprises a laser light source; the coupling lens is arranged on an emergent light path of the laser light source, and the light incident side and / or the light emergent side of the coupling lens are / is provided with an aperture diaphragm; and the tail fiber is arranged on an emergent light path of the coupling lens, light emitted by the laser light source is coupled into the tail fiber through the coupling lens, and by setting the type of the tail fiber and designing an optical fiber coupling end face, echoes and stray light generated at the optical fiber coupling end face are reduced, the influence of the echoes and the stray light on output of the laser is weakened and avoided, and the imaging quality is improved.

The present invention relates to a hybrid connector comprising connector pins and connector socket that is RF-connected, optically connected and mechanically coupled to the connector pins, wherein the connector pins include: an optical connector pin for transmitting an optical signal and an RF connector pin for transmitting an RF signal; a connector pin alignment portion for aligning the optical connector pin with the RF connector pin; and a connector pin coupling portion provided on the connector pin alignment portion, the connector socket includes: an optical connector socket optically connected to the optical connector pin and an RF connector socket RF-connected to the RF connector pin; a connector socket alignment portion for aligning the optical connector socket with the RF connector socket; and a connector socket coupling portion which is provided on the connector socket alignment portion and which can be mechanically coupled to and decoupled from the connector pin coupling portion. According to the present invention, an optical signal and an RF signal can be transmitted, and an optical connection and an RF connection can be established with a small number of components.

To provide a favorable microstructured fiber optic oscillator and waveguide for a fiber scanner.SOLUTION: Described are optical fibers and scanning fiber displays comprising the optical fibers. The disclosed optical fibers include a plurality of mass adjustment regions, such as gas-filled regions, positioned between a central waveguiding element and an outer periphery for reducing the mass of the optical fiber compared to an optical fiber lacking the plurality of mass adjustment regions.SELECTED DRAWING: None