147 results about "Microstructured optical fiber" patented technology

There is provided fiber drop terminals (“FDTs”) and related equipment for providing selective connections between optical fibers of distribution cables and optical fibers of drop cables, such as in multiple dwelling units. The FDTs require relatively little area and/or volume while providing convenient connectivity for a relatively large number of optical connections. The FDTs include adapters for optically connecting the connectors, and the adapters of some FDTs are adapted to rotate, move, or otherwise be removed to provide convenient access for technicians. Some FDTs and the related equipment are adapted for use with microstructured optical fiber having preferred bend characteristics.

There is provided splice trays and splice assemblies that provide convenient access to optical fiber slack within a relatively small area or volume. Some splice trays are adapted for use with microstructured optical fibers to further reduce the size of the splice tray or splice assembly. Some splice trays provide fiber routing devices on the cover of the splice tray. The fiber routing device may be positioned on an inside surface of the cover and/or on an outside surface of the cover. The splice trays and/or splice assemblies may be used with or as fiber drop terminals used within multiple dwelling units.

There is provided fiber optic hardware and hardware components adapted to provide a desired amount of fiber optic connectivity and/or functionality for a desired amount of volume, materials, etc. The fiber optic hardware components include, but are not limited to multiports, local convergence points (LCPs), particularly LCPs for multiple dwelling units or similar applications, network interface devices, equipment frames, and fiber distribution hubs. Certain fiber optic hardware components are adapted to accommodate microstructured optical fiber or other bend performance optical fiber.

An optical fiber suitable for use in a single fiber or multifiber optical connector or array is structured with a core region and a cladding region surrounding the core region, and exhibits a bending loss of a fundamental mode of the fiber at a wavelength λ is lower than 0.1 dB/m at a diameter of 15 mm, a mode-field diameter of the fundamental mode at an end of the fiber at the wavelength λ is between 8.0 μm and 50 λ, and a bending loss of a first higher-order mode at the wavelength λ is higher than 1 dB/m at a diameter of 30 mm. The fiber may be multistructured, wherein the cladding region comprises a main medium and a plurality of sub medium regions therein to form a spatially uniform average refractive index.

A microstructured fiber having a cladding comprising a number of elongated features that are arranged to provide concentric circular or polygonial regions surrounding the fiber core. The cladding comprises a plurality of concentric cladding regions, at least some of which comprising cladding features. Cladding regions comprising cladding features of a relatively low index type are arranged alternatingly with cladding regions of a relatively high index type. The cladding features are arranged in a non-periodic manner when viewed in a cross section of the fiber. The cladding enables waveguidance by photonic bandgap effects in the fiber core. An optical fiber of this type may be used for light guidance in hollow core fibers for high power transmission. The special cladding structure may also provide strong positive or negative dispersion of light guided through the fiber-making the fiber useful for telecommunication applications.

Systems and methods of collapsing the air lines in the air line-containing region of a nanostructure optical fiber are disclosed. One method includes initiating irradiation of a portion of the nanostructure optical fiber from essentially opposite directions with at least first and second laser beams having substantially equal power and essentially the same mid-infrared wavelength. The method includes continuing the irradiation for an irradiation time t₁ so as to bring the optical fiber portion to a softening temperature T_S at which the air lines in the optical fiber portion collapse into the adjacent cladding. Exemplary optical systems for carrying out the air- line-collapsing methods of the present invention are also disclosed.

A microstructured optical fiber is described. The microstructured optical fiber comprises an inner region and an outer region. The inner region includes an inner material and a plurality of holes formed in the inner material. The outer region surrounds the inner region, and includes an outer material. The softening point temperature of the inner material is greater than the softening point temperature of the outer material by at least about 50° C. Microstructured optical fiber preforms and methods for making the microstructured optical fibers are also described. The microstructured optical fiber may be made to have substantially undistorted holes in the inner region.

Microstructured optical fiber (MOF) includes a cladding extending a length between first and second ends. The cladding includes an inner porous microstructure that at least partially surrounds a hollow core. A perimeter contour of the hollow core has a non-uniform radial distance from a center axis of the cladding such that first segments of the cladding along the perimeter contour have a shorter radial distance from the center axis relative to second segments of the cladding along the perimeter contour. The cladding receives and propagates light energy through the hollow core, and the inner porous microstructure substantially confines the light energy within the hollow core. The cladding defines at least one port hole that extends radially from an exterior surface of the cladding to the hollow core. Each port hole penetrates the perimeter contour of the hollow core through one of the second segments of the cladding.

The present invention relates to a microstructured optical fiber including a photonic band gap-guided core; and at least one index-guided core. Another embodiment of the present invention relates to a microstructured optical fiber including a set of main cores; a microstructured region surrounding the set of main cores; and at least alignment core, the alignment cores having substantially different optical propagation properties than the main cores. The present invention also includes methods for coupling, monitoring, and locating discontinuities in the fibers of the present invention.

The invention discloses a bent non-sensitive micro-structured optical fiber and a production method thereof. The bent non-sensitive micro-structured optical fiber comprises a germanium-doped fiber core and a quartz covering layer which covers the periphery of the fiber core; and 12 air holes are uniformly distributed on the surrounding of the fiber core. The production method comprises the following steps of: utilizing rod making equipment to prepare the germanium-doped fiber core; uniformly arraying 12 quartz pipes in a circumferential direction of the surrounding of the fiber core; fixing the tail ends of the 12 quartz pipes to form an integrated rod combining the bunched fiber cores and the quartz pipes; covering a quartz sleeve on the periphery of the integrated rod to form a bent non-sensitive micro-structured optical fiber prefabricated rod; and utilizing an optical fiber drawing tower to draw the bent non-sensitive micro-structured optical fiber prefabricated rod into the bent non-sensitive micro-structured optical fiber. According to the production method provided by the invention, the problem of bad bending loss effects caused by the asymmetry of micro-pores in the actualproduction process can be effectively solved and better characteristics such as small bending radius and low loss can be provided.

A microstructured optical fiber exhibiting enhanced circularity of the guided light mode is provided. The microstructured optical fiber includes a light-guiding core and a primary cladding surrounding the core wherein the primary cladding has a plurality of holes arranged in hexagonal unit cells defining an Archimedean-like lattice. Preferably, the core is defined by a break in a center of the Archimedean-like lattice, the break being characterised by an absence of at least one of the unit cells. Also preferably, each of the unit cells has seven holes arranged in a centred hexagon. A method of making the microstructured optical fiber is also provided. The method includes fabricating a fiber preform by stacking a plurality of canes around a rod, each cane having a number of holes arranged in a unit cell defining an Archimedean-like lattice, and drawing said fiber preform into the microstructured optical fiber.

The invention relates to an optical fiber comprising a core and a cladding comprising a core material and a cladding material, respectively, wherein said fiber is a non-linear microstructured optical fiber, said microstructured optical fiber being obtainable by a method comprising loading with hydrogen and/or deuterium and optionally anneal and/or irradiation hereby the lifetime of the fiber may be extended in high power applications.

Microstructured optical fiber for single-moded transmission of optical signals, the optical fiber including a core region and a cladding region, the cladding region including an annular hole-containing region that contains non-periodically disposed holes. The optical fiber provides single mode transmission and low bend loss.

The invention discloses a functional material filled micro-structure optical fiber based tunable dual-channel grating filter which comprises a birefringent micro-structure optical fiber grating filled with functional material and a control device, wherein the birefringent micro-structure optical fiber grating filled with the functional material is positioned in the control device, and the control device is used for generating, loading and regulating electric field, temperature, optical field, magnetic field or sound field which can change the refractive index of the functional material in the birefringent optical fiber. Compared with the prior art, the filter has the advantages of flexible realization way, varied tuning mode, wide tuning range, and can realize the electric tuning. The invention can be widely applied to the fields of tunable lasers, optical fiber sensors, and the like, is suitable for large-scale popularization and application and has great significance of production practice.

The invention discloses a weak-guide annular-structure optical fiber. The weak-guide annular-structure optical fiber comprises an annular fiber core, a central zone and a cladding. The annular fiber core has step or gradient type refractive index distribution, and an auxiliary low-refractive-index annular groove can be disposed in an inner or outer side. A refractive index difference between the annular fiber core and the clapping/central zone does not exceed 1%. A refractive index difference between the annular groove and the clapping/central zone does not exceed -1%. The weak-guide annular-structure optical fiber only supports a multichannel radial first-order mode and is divided into different mode groups. The other mode groups except for the two front mode groups have large refractive index differences. The front two mode groups can be combined and then be multiplexed through a 6*6 Multiple Input Multiple Output (MIMO) digital signal processing assist, the other mode groups are multiplexed through a 4*4 MIMO-DSP assist in each mode group, i.e., inter-mode-group low-crosstalk multiplexing and small-scale MIMO-DSP assist multiplexing in mode groups are combined. Expandability is possessed. A mode base can be a linear polarization/optical vortex/intrinsic mode. And, the weak-guide annular-structure optical fiber has a C+L waveband broadband characteristic and is compatible with existing mature optical fiber technology, the communication capacity can be effectively improved through a combination with wavelength division multiplexing, and loss can be reduced.

A silica material having a higher purity than a cylindrical preform formed of a silica material is deposited on at least one of an inner side and an outer side of the preform to fabricate a cylindrical intermediate member. A part of the cylindrical intermediate member including at least a part of the preform is removed to fabricate a high-purity silica tube. A plurality of the high-purity silica tubes is bundled with a core rod arranged at a center axis of a bundle of the high-purity silica tubes, and the bundle of the high-purity silica tubes with the core rod arranged at the center axis is drawn to obtain a microstructured optical fiber.

A microstructured optical fiber is structured with a core region and a plurality of cladding regions surrounding the core region. Chromatic dispersion is relatively flat over a broad wavelength range with a small effective area, without need for air holes that are unacceptably small. An enlarged effective core area is obtained by selectively closing the holes in the innermost cladding, which holes are smaller and easier to close than the holes in other regions.

The invention relates to a micro optical fiber, especially providing a micro optical fiber with stop function on long wavelength, which can be used in optical fiber laser, optical fiber amplifier, and optical fiber filter. It is formed by core fiber, reflective index concave layer and coat. Wherein, the reflective index concave layer is between the core fiber and the coat; the reflective index concave layer and the coat have some arranged holes, via whose shape, size, and distribution, to control the average effective reflective index, to make the reflective index of concave layer lower than the reflective indexes of core fiber and coat. Compared to common optical fiber, the invention can control reflective index more accurately and easily, while it has large long wavelength loss and small short wavelength loss, to be used as optical filter. The core filter is doped with rare earth ion; the low reflective index layer can make the light emitted by doped optical fiber excurse to short wavelength, to prepare special optical fiber powered device.