377results about "Optical fibre with multilayer core/cladding" patented technology

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 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.

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 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.

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 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.

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 application provides an energy transmission optical fiber, a preparation method thereof and a fiber laser. The energy transmission optical fiber comprises a core layer and a cladding layer. The core layer comprises an inner core layer, an inner recess layer and an outer core layer which are sequentially covered, and the cladding layer is covered on the outer wall of the outer core layer. The shape of the section of the inner core layer is circular, the shape of the section of the inner recess layer is annular, the inner wall of the section of the outer core layer is circular annular, and the outer wall of the section of the outer core layer is rectangular annular along the extension direction of the energy transmission optical fiber. The inner core layer and the inner recess layer are concentrically arranged, and the outer core layer is centrally symmetric along the center of the inner core layer. The refractive indexes of at least two of the inner core layer, the inner recess layer and the outer core layer are different. The energy transmission optical fiber has good uniformity of the energy of the light beam output by the energy transmission optical fiber, and the fiber laser using the energy transmission optical fiber is not easy to cause damage to the plate when cutting the plate.

The application discloses a kind of photonic crystal fiber of bending resistance and with high Brillouin scattering gain, including surface layer, intermediate layer and core layer;Surface layer includes first oval air hole, and first oval air hole is arranged along the circumferential direction of photonic crystal fiber;Intermediate layer includes first part, second part, third part and fourth part, first part and third part are oppositely arranged, and respectively include a plurality of first circular air hole arranged into trapezoidal;Second part and fourth part are oppositely arranged, and respectively include a plurality of first circular air hole arranged into square;Core layer includes two symmetrically arranged second circular air hole, and the gap between each second circular air hole and first part and third part is filled with symmetrically arranged third circular air hole and third oval air hole.The application not only has good bending resistance, but also has higher Brillouin scattering gain.

A multicore optical fiber may include a common cladding comprising a radius R4 defining a glass portion of the optical fiber and having a cladding relative refractive index Δ4. At least two waveguides may extend through the common cladding. Each waveguide may include a core region, an inner cladding region, and a depressed cladding region. Each core region may include a maximum relative refractive index Δ1max. Each inner cladding region may include a relative refractive index Δ2. Each depressed cladding region may include a minimum relative refractive index Δ3min and a trench volume from 20-45%µm2 such that Δ1max>Δ2>Δ3min, and Δ4>Δ3min. A cable cutoff wavelength of each waveguide is ≤1150 nm. The co-propagating and counter-propagating inter-waveguide cross talk between each waveguide and a nearest waveguide is <-35 dB at 1310 nm and <-20 dB at 1550 nm for application lengths of 20 m. A mode field diameter of each waveguide is 8.2-9.0 µm at 1310 nm.

The invention provides a glucose hydrogel optical fiber sensor and a preparation method thereof. The glucose hydrogel optical fiber sensor comprises an optical fiber and a glucose fluorescence sensing module fixedly carried on the end face of the optical fiber. Wherein the optical fiber comprises a double-layer hydrogel optical fiber which comprises an inner fiber core and an outer cladding. The glucose fluorescence sensing module is formed by fixing a glucose fluorescence probe containing a boric acid group and a terminal amino group through a covalent reaction between the amino group and an epoxy group in the hydrogel network. The glucose hydrogel optical fiber sensor has excellent performance, high sensitivity and good selectivity, and can realize stable and real-time detection of glucose concentration in a complex physiological environment. The sensor is flexible in structure and good in biocompatibility, does not depend on enzyme reaction, and avoids the problem of signal drift caused by enzyme inactivation; meanwhile, the sensor is good in repeatability, can be integrated with other optical sensing modules to realize multi-parameter synchronous monitoring, and is suitable for long-term dynamic monitoring application in vivo.

The invention 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 application relates to a hollow optical fiber and an optical cable, the hollow optical fiber comprising a cladding region and a core region; the cladding region comprising, from outside to inside, an outer cladding and an anti-resonance layer; the core region comprising a region surrounded by the boundary of the anti-resonance layer and the outer cladding; wherein the anti-resonance layer comprises a plurality of rotationally symmetric distributed nested units, the nested units comprising a first nested ring and a second nested ring nested in the first nested ring, the first nested ring being connected to the inner wall of the outer cladding with a first arc length, and the second nested ring being connected to the inner wall of the first nested ring at the position where the first nested ring is connected to the inner wall of the outer cladding with a second arc length. The application can solve the problem of poor stability of the nested ring structure of the hollow optical fiber in the prior art, which is easily deformed by external stress.

The application discloses a bending-insensitive high-bandwidth multi-mode optical fiber, which comprises a core layer, an extension layer, an inner cladding layer, a sunken cladding layer and an outer cladding layer arranged in sequence from inside to outside, the refractive index profile of the core layer is parabolic, the distribution index is 1.9-2.2, the maximum relative refractive index difference of the core layer center position is 0.9%-1.2%, the relative refractive index difference of the extension layer is -0.03% to -0.02%, the difference between the highest relative refractive index difference and the lowest relative refractive index difference of the inner cladding layer is 0.005%-0.03%, the single-side radial width of the inner cladding layer is 0.5-4 mu m, the single-side radial width of the sunken cladding layer is 3-9 mu m, and the relative refractive index difference of the sunken cladding layer is -0.7% to -0.4%. In the application, the optical fiber viscosity is optimized, the sensitivity of the optical fiber bandwidth to wavelength is reduced, the optical fiber has good bending resistance and super high bandwidth performance by reasonably designing the waveguide structure and the doping system.

The invention relates to an ultralow-loss single-mode optical fiber and a preparation method thereof, the optical fiber comprises a core layer and cladding layers, the core layer is divided into two layers, the radius R1 of the first core layer is 1-2 [mu] m, the delta n1 is-0.12--0.07%, the radius R2 of the second core layer is 4-6 [mu] m, the delta n2 is 0-0.05%, the inner cladding layer comprises a first inner cladding layer and a second inner cladding layer, the radius R3 of the first inner cladding layer is 8-12 [mu] m, the delta n3 is-0.28--0.23%, and the second inner cladding layer comprises a third inner cladding layer and a fourth inner cladding layer. The radius R4 of the first inner cladding layer is 20-40 [mu] m, the radius R4 of the second inner cladding layer is 20-40 [mu] m, the delta n4 is-0.36--0.25%, the delta n3-delta n4 is greater than or equal to 0, the delta n5 of the outer cladding layer is-0.25--0.15%, alkali metals are doped in the core layers, the average content of the alkali metals in the first core layer is 500-600 ppm, and the average content of the alkali metals in the second core layer is 600-900 ppm. The defect that the concentration of alkali metal is reduced along with the increase of the radius of the fiber core due to the conventional thermal diffusion doping technology is overcome, the viscosity of the core layer is reduced as much as possible, and the transmission loss of the optical fiber is further reduced.

The utility model relates to the technical field of optical fibers, in particular to a multi-core optical fiber structure, which comprises a multi-core optical fiber body, and the multi-core optical fiber body is sequentially provided with a reinforcing core, a multi-layer core array and a composite sheath from inside to outside. A plurality of isolation groove layers are uniformly embedded among the multiple layers of wire core arrays, the multiple layers of wire core arrays are provided with three groups of inner-layer main cores circularly surrounding the reinforcing core and six groups of outer-layer auxiliary cores arranged around the outer rings of the main cores and distributed in a hexagonal shape, and each isolation groove layer comprises a layer of isolation ring arranged between the inner-layer main cores and the outer-layer auxiliary cores. The isolation grooves are arranged between the adjacent main cores and between the adjacent auxiliary cores and are of a V-shaped structure. According to the structure, a topological optimization and isolation structure mode is adopted, and the overall anti-crosstalk and anti-bending capability is effectively improved.

An optical fiber cable comprises at least one hollow-core fiber having a tight buffer formed around the hollow-core fiber. The tight buffer has a multi-layer construction whereby an inner layer is tightly formed around an outer surface of the hollow-core fiber and an outer layer is tightly formed around the inner layer. The inner layer is formed of a soft material having a low elastic modulus, whereas the outer layer is formed of a material having a higher elastic modulus than the inner layer.

A multicore fiber includes multiple first linear portions that include a first core portion and a first cladding portion having a refractive index lower than a maximum refractive index of the first core portion and surrounding an outer periphery of the first core portion, and a first tubular portion. The first linear portions are respectively joined to an inner wall of the first tubular portion, and two of the first linear portions are not in contact with each other on a first virtual line connecting centers of the two of the first core portions included in two of the first linear portions on a cross-section perpendicular to the longitudinal direction, at least in a portion in a longitudinal direction.

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.

An optical fiber includes a core made of silica glass, and a cladding surrounding the core and made of silica glass. A product of a center wavenumber kω4 and a half width at half maximum kH4 of a peak of Raman scattered light ω4(TO) obtained by irradiating the core with excitation light having a wavelength of 532 nm is 38000 cm−2 or less.

The optical fiber type light spot homogenizer comprises a machine frame, a laser source is arranged at one end of the machine frame, a multimode optical fiber corresponding to the laser source is arranged at the other end of the machine frame, the laser source emits a laser beam, the multimode optical fiber receives the laser beam, and the multimode optical fiber is connected with the machine frame. The multi-mode fiber laser is characterized in that the relative refractive index difference section of the inner side of the sunken inner cladding of the multi-mode fiber is in a two-stage step decreasing shape, and the center line of the laser beam and the center of the end face of the multi-mode fiber are aligned and offset in parallel by a section of radial offset. The device is small in size, low in cost, compact in structure, good in homogenization effect and stable in performance, and can be directly seamlessly integrated with an input laser source and an output optical fiber system. The optical fiber type light spot homogenizer assembly and the laser beam shaping system can achieve efficient light spot homogenization within the centimeter-level distance. The system can be applied to a vehicle-mounted laser radar, a vehicle-mounted head-up display, a multimode PON optical splitter, laser medical equipment or laser material processing equipment and the like.

The embodiments of the present disclosure generally relate to methods for increasing high-order mode suppression in large mode area ring fibers. This approach may raise the transverse mode instability (TMI) threshold and enable further mode field diameter (MFD) scaling for higher power. Disclosed herein is an optical fiber comprising a core having a set of core characteristics and a cladding ring around the core, the optical fiber having a fundamental mode effective MFD between 14 microns and 40 microns, the optical fiber having a L-mode area ring fiber. HOM 4 shows the higher mode losses of the

A polarization-maintaining optical fiber includes at least one polarization maintaining core, a first cladding surrounding the at least one polarization maintaining core, and a second cladding surrounding the first cladding. The at least one polarization maintaining core includes a core and a pair of low-refractive-index portions each having a refractive index lower than a refractive index of the core. In a cross section, at least a portion of an outer periphery of each of the pair of low-refractive-index portions is in contact with the core, and an outer periphery of the core, excluding portions each being in contact with the low-refractive-index portions, has a circular shape. A maximum value of an absolute value of a residual stress in the cross section is 100 MPa or less. A mode-field flattening f is 0.05 to 0.40 at any wavelength within a range of 850 nm to 1625 nm.

The invention discloses a laser output optical device, a laser, equipment and a method. The laser output optical device comprises an output optical fiber, an optical waveguide and an optical output head which are connected in sequence, the output optical fiber is used for outputting point ring light beams, a cladding layer, wrapping the second fiber core, of at least partial area, close to the output optical fiber, of the optical waveguide comprises a second conical structure, and the cross section of the second conical structure is annular. The outer diameter of the second conical structure is gradually increased in the light beam transmission direction, and the second conical structure is used for adjusting the light path of the point ring light beam so as to adjust the divergence angle of inner and outer ring light beams. And the optical output head is used for outputting the light beam adjusted by the optical waveguide. The pre-modulated light from the output optical fiber is accurately regulated and controlled, the divergence angle of the output light is adjusted, the light beam quality is improved, and meanwhile the device has the advantages of being simple in structure, low in cost and high in stability.

To provide an optical fiber which offers a wide irradiation range and superior tensile strength and is capable of emitting less yellowish white light, and to provide a medical device, an illumination device, and an ophthalmic surgery illumination probes using the same.SOLUTION: An optical fiber comprises a core and cladding, in which a light transmission loss at 525 nm is 2,500 dB / Km or less and a yield point stress coefficient represented by the following formula is 40 or greater. The core contains a polymer 1 having a glass transition temperature Tg of 137°C or higher and 147°C or lower and a refractive index of 1.55 or greater. Expression: yield point stress coefficient=yield point stress (N) / (fiber diameter (mm))2.SELECTED DRAWING: None

This invention belongs to the field of optical fiber communication technology and discloses a multi-core optical fiber suitable for integrated communication and sensing. It includes a common cladding and a fiber core. The common cladding surrounds the outer periphery of the fiber core. The fiber core includes a transmission core located at the center of the multi-core optical fiber and multiple sensing cores surrounding the transmission core. From the inside out, the transmission core includes a first core layer, a first inner cladding, and a first recessed layer. From the inside out, the sensing cores include a second core layer, a second inner cladding, and a second recessed layer. This invention enables simultaneous communication transmission and sensing functions, ensuring high-capacity transmission while also enabling the monitoring of sensing parameters.

The invention relates to a single-mode optical fiber comprising: - a core (10) having a refractive index n, wherein the core comprises a region in which the value of n decreases from a value n0, to a value n2; and - a cladding (20) comprising: ∘ a first layer of cladding (21) wherein the refractive index is n2; and ∘ a second layer of cladding (22) wherein the refractive index is n3, lower than n2; ∘ a third layer of cladding (23) wherein the refractive index is n4, higher than n3; wherein the core radius r1 is comprised between 2.5 µm and 5.5 µm; and wherein a refractive-index difference Δn0 = n0 - n4 is higher than 5.8 × 10-3; and wherein a refractive-index difference Δn2 = n2 - n4 is between 1 × 10-3 and 2.5 × 10-3; and wherein a refractive-index difference Δn3 = n3 - n4 is lower than 0.

An antireflective coating includes a plurality of first layers, each comprising a first material having a relatively high refractive index; and a plurality of second layers, each comprising a second material having a relatively low refractive index. The total thickness of the first layers, composed of the first material, is about 120 nm or less. Furthermore, when light propagates under total internal reflection, the antireflective coating is configured to absorb about 0.25% or less of the light at each wavelength between about 425 nm and about 495 nm to achieve single reflection of the average of the s-polarization and p-polarization of the light.