Abstract: An optical unit in which an optical part having an optical element is mounted on a base having an optical waveguide includes a hydrophobic first area formed in a region including an optical axis of the optical part, a hydrophobic second area formed in a region facing the first area on a surface of the base, and a hydrophilic filler which fills peripheries of the first area and the second area between the optical part and the base.

Abstract: A breakout cable includes a polymer jacket and a plurality of micromodules enclosed within the jacket. Each micromodule has a plurality of bend resistant optical fibers and a polymer sheath comprising PVC surrounding the bend resistant optical fibers. Each of the plurality of bend resistant optical fibers is a multimode optical fiber including a glass cladding region surrounding and directly adjacent to a glass core region. The core region is a graded-index glass core region, where the refractive index of the core region has a profile having a parabolic or substantially curved shape. The cladding includes a first annular portion having a lesser refractive index relative to a second annular portion of the cladding. The first annular portion is interior to the second annular portion. The cladding is surrounded by a low modulus primary coating and a high modulus secondary coating.

Abstract: A fiber optic ribbon cable includes a jacket of the cable, the jacket having a cavity defined therein, an optical element including an optical fiber and extending within the cavity of the jacket, and a dry water-blocking element extending along the optical element within the cavity. The dry water-blocking element is wrapped around the optical element with at least a portion of the dry water-blocking element disposed between another portion of the dry water-blocking element and the optical element, thereby defining an overlapping portion of the dry water-blocking element. The optical element interfaces with the overlapping portion to provide direct or indirect coupling between the optical element and the jacket.

Abstract: A light receiving device has a light receiving section for receiving a remote control signal light beam, and a light guide section for guiding the light beam to the light receiving section. The light guide section has a first reflection surface for reflecting the light beam to the light receiving section, the first reflection surface being disposed to oppose obliquely at a sharp angle to an entrance plane, and a second reflection surface for guiding the remote control signal light beam, the second reflection surface being disposed between the entrance plane and the first reflection surface. The first reflection surface includes a circular arc curved surface curved outward in a part closer to the entrance plane and farther from the light receiving section, and a linear inclined surface in a part approaching the light receiving section from the curved surface.

Abstract: A system and method for controlling hydrogen concentration in optical sensing systems in subsurface wells. In an exemplary system the downhole optical fiber sensors are positioned within nested conduits and a controlled concentration hydrogen gas is flowed in a first direction through the first conduit, and flowed in a second direction through the annulus, wherein the second direction is opposite to the first direction.

Abstract: Dual coated optical fibers and methods for forming dual coated optical fibers are disclosed herein. The dual coated optical fibers include a glass fiber comprising a core region, a cladding region and a dual coating layer surrounding the glass fiber. The dual coating layer includes an inner coating and an outer coating. The inner coating surrounds the glass fiber and includes a first polyimide material. In one embodiment the first polyimide material also includes an adhesion promoter. The outer coating surrounds and is in direct contact with the inner coating and includes a second polyimide material having a decomposition threshold temperature greater than the first polyimide material. The second polyimide material may also have a modulus of elasticity greater than the first polyimide material and a moisture uptake lower than the first polyimide material.

Abstract: An optical cable includes an outer tubing. At least one optical fiber disposed within the outer tubing. A stiffening member configured to bend with bending of the outer tubing; wherein the stiffening member shifts a neutral plane of the cable away from the at least one optical fiber. Also included is a method of increasing a bending sensitivity in an optical cable.

Abstract: A cable routing system is described. More specifically, described is a cable routing system that includes a main fiber channel configured to receive a drop fiber to allow it to fit within the main fiber channel, where the channel is surrounded by a discontinuous segmented duct, and the duct comprises a continuous flange structure to provide support for the system as it is installed on or fastened to a wall or other generally flat surface.

Abstract: A connectorized fiber optic cabling assembly includes a loose tube fiber optic cable and a connector assembly. The cable has a termination end and includes: an optical fiber bundle including a plurality of optical fibers; at least one strength member; and a jacket surrounding the optical fiber bundle and the at least one strength member. The connector assembly includes a rigid portion and defines a fiber passage. The connector assembly is mounted on the termination end of the cable such that the optical fiber bundle extends through at least a portion of the fiber passage. The plurality of optical fibers of the optical fiber bundle have a ribbonized configuration in the rigid portion of the connector assembly and a loose, non-ribbonized configuration outside the rigid portion. The plurality of optical fibers undergo a transition from the ribbonized configuration to the loose, non-ribbonized configuration in the rigid portion of the connector assembly.

Abstract: A fiber optic cable includes one or more optical fibers, a jacket, strength members, and water-swellable powder. The jacket is formed from a polymer and has a cavity defined therein. The one or more optical fibers extend through the cavity. Further, the jacket is non-round in cross-section and the strength members are encapsulated in the jacket on opposite sides of the cavity. The water-swellable powder is at least partially mechanically attached to an inner surface of the cavity, where the mechanical attachment of the water-swellable powder allows a portion of particles of the water-swellable powder to protrude beyond the surface and not be completely embedded therein.

Abstract: An optical cable comprises an optical fiber ribbon, a tension member and a sheath. The optical fiber ribbon is constructed by integrating a plurality of optical fibers arranged in parallel. The sheath is provided so as to surround the optical fiber ribbon. The sheath is used for protecting the optical cable. One optical fiber ribbon is arranged twistably within an inner space surrounded by the sheath.

Abstract: An optical fiber cable is provided as one capable of preventing damage of an inside tube and an outside tube. An optical fiber cable 1 is provided with an optical fiber 2 for propagating laser light, an inside tube 3 housing an end portion of this optical fiber 2, and an outside tube 4 arranged outside the inside tube 3 and surrounding the inside tube 3. A space portion 5 is provided between the optical fiber 2 and an inner peripheral surface of the inside tube 3.

Abstract: A hybrid cable has optical conductors and electrical conductors. The electrical conductors are selected to have varying resistances per unit length, depending upon the distance from a power source at which the conductor is expected to terminate. The use of varying resistance conductors can be used to balance the power supplied to external devices and to lower cable cost, size, and weight.

Abstract: Disclosed is a composite optical fiber which has high flexibility and is hard to break. The composite optical fiber comprises a larger-diameter optical fiber and smaller-diameter optical fibers each having a smaller diameter than that of the larger-diameter optical fiber, wherein the larger-diameter fiber and the smaller-diameter optical fibers are so arranged that the larger-diameter fiber is surrounded by the smaller-diameter optical fibers, and the smaller-diameter optical fibers that surround the larger-diameter optical fiber are made from a plastic material.

Abstract: The present invention provides optical-fiber communication cables with an improved water-blocking element that reduces or eliminates microbending caused by the water-swellable particulate powders by employing such water-swellable powders in conjunction with a smooth but perforated compression-resistant carrier tape. The water-blocking element is deployed within optical-fiber buffer tubes to water-block the buffer tubes and to minimize microbending that can occur when water-swellable particulate powders press against optical fibers.

Abstract: Cables have reduced freespace, reduced tube diameters, and reduced strength member diameters. The cables are designed to pass robustness testing such as GR-20 while using smaller amounts of raw materials to produce.

Abstract: A fiber optic cable for use in a downhole environment is disclosed. The fiber optic cable includes a tube having an interior region; an optical fiber disposed in the interior region of the tube; a gas in the interior region; and a gel in the interior region, wherein the gel is configured to reduce stress on the optical fiber in the presence of the gas at a temperature substantially near the flashpoint of the gel. One or more seals can be used to seal the gel and the inert gas in the interior region. In various aspects, the fiber optic cable can be used in a downhole environment.

Abstract: An optical fiber cable including, in a radial direction outward, a central strength member, a first layer of loose buffer tubes stranded around the central strength member, at least one of the loose buffer tubes of the first layer containing at least one light waveguide, an intermediate layer, a second layer of loose buffer tubes stranded around the intermediate layer, at least one of the loose buffer tubes of the second layer containing at least one light waveguide, and a jacket surrounding the second layer of loose buffer tubes, wherein the intermediate layer is formed of a material having a high coefficient of friction.

Abstract: A modular cable unit for oilfield wireline includes multiple cable modules. The cable modules are interchangeable to achieve a modular cable unit with desired telemetry and electrical properties to suit a specific application. The cable modules can be an optical fiber module, a power cable or an opto-electrical module assembly. The cable modules that make up the modular cable unit are preferably arranged in a triad configuration defining a substantially triangular tangent periphery and are surrounded by a polymeric casing having a circular periphery. The triad configuration of the modular cable unit contributes to an improved mechanical strength. A floating-tube type optical fiber element with improved mechanical strength is also disclosed.

Abstract: A fiber optic assembly includes a buffer tube forming an elongate passage and a plurality of optical fibers positioned therein. The buffer tube includes at least one layer of a composite material that includes a base material and a filler material blended therein. Particles of the filler material have an acicular structure, having a longest dimension that is on average at least ten times a narrowest dimension of the particles. Further the buffer tube has kink resistance.

Abstract: An optical communication cable is provided. The cable includes a core element located in a cable jacket. The core element includes a buffer tube having an outer surface, an inner surface and a channel defined by the inner surface of the first tube. The core element includes an optical fiber located within the channel of the buffer tube and a color layer formed from a surface-deposited colorant material applied to the outer surface of the buffer tube.

Abstract: An armored cable having a polymer covering where the bond between the armor and the covering is controlled by introducing particulate matter at the interface of the armor and covering. A filler material is applied to the exterior surfaces of the cable strength elements in order to inhibit the formation of voids in the polymer covering that would otherwise promote water migration along the cable.

Abstract: An apparatus for connecting buffer tubes including a first block, a second block, and a fastener for assembling said first and second blocks. The blocks contain a pair of tube grooves and a cavity and a and a hole leading into the cavity. A sealant is then inserted into the cavities and allowed to cure.

Abstract: A fiber optic cable includes a cable jacket and a core. The cable jacket is tubular, having exterior and interior surfaces, and is formed mostly from a first polymeric material. The jacket includes access features formed from a second polymeric material at least partially embedded in the first polymeric material and extending lengthwise along the jacket. Two of the access features are spaced apart from one another with a section of the jacket formed from the first polymeric material extending laterally therebetween, such that the section may be peeled apart from the rest of the cable lengthwise along the jacket by separation of the jacket about the access features. The core has an outermost surface and includes optical fibers and a strength member. The outermost surface of the core is at least partially bonded to the interior surface of the jacket, which enhances coupling between the jacket and core.

Abstract: Disclosed is a composition for a high strength loose tube type fiber optic cable with excellent flexibility and excellent impact resistance, which includes a polypropylene-polyethylene copolymer having a melt flow index (MFI) of 1.1 g/10 minutes to 3.0 g/10 minutes at 230° C. and a flexural modulus of 10,000 to 23,000 kg/cm2. A fiber optic cable including a loose tube formed with the composition for a high strength loose tube type fiber optic cable has excellent flexibility and impact resistance as well as excellent appearance.

Abstract: An example fiber optic cable includes an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis. The transverse cross-sectional profile has a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis. The maximum width of the transverse cross-sectional profile is longer than the maximum thickness of the transverse cross-sectional profile. The outer jacket also defines first and second separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket. The second passage has a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket. The fiber optic cable also includes a plurality of optical fibers positioned within the first passage a tensile strength member positioned within the second passage.

Abstract: The present invention provides optical-fiber communication cables with an improved water-blocking element that reduces or eliminates microbending caused by the water-swellable particulate powders by employing such water-swellable powders in conjunction with a smooth but perforated compression-resistant carrier tape. The water-blocking element is deployed within optical-fiber buffer tubes to water-block the buffer tubes and to minimize microbending that can occur when water-swellable particulate powders press against optical fibers.

Abstract: A fiber optic cable comprises a jacket defining an outer peripheral surface and a radial thickness terminating at an inner periphery defining a surface, a multiplicity of optical fibers which are enclosed by and extend longitudinally through the jacket within the volume defined by the inner periphery of the jacket, and a plurality of plugs longitudinally spaced within the jacket, where each of the plugs envelops the optical fibers along a fixed longitudinal extent while being closely adjacent he surface defined by the inner periphery of the jacket. The system may further comprise the plugs being of a silicone-based material, and absorbent material disposed within the jacket between the plugs.

Abstract: A non-kink, non-hockling optical cable comprising an optical fiber capable of propagating light along its longitudinal axis. A buffer layer made of a soft plastic material surrounds the silica core and cladding, and a supplemental layer surrounds the buffer layer. The supplemental layer consists essentially of a liquid crystal polymer (LCP) material to enhance the tensile strength of the optical fiber. Finally, an encasing polymer layer with a breaking strain greater than 30%, surrounds the supplemental layer, to increase the flexibility of the optical cable.

Abstract: An optical fiber is disclosed which includes a protective outer jacket. The outer protective jacket is grooved to include one or more peripheral grooves formed into the jacket. In operation of a laser device, laser energy passes through the optical fiber to the distal tip of the optical fiber. As the distal tip erodes, the outer protective jacket also erodes in a controlled fashion such that portions of the outer jacket flake off as the fiber tip erodes to the position of the peripheral grooves formed in the outer jacket rather than in a random fashion.

Abstract: There are provided optical fiber configurations that provide for the delivery of laser energy, and in particular, the transmission and delivery of high power laser energy over great distances. These configurations further are hardened to protect the optical fibers from the stresses and conditions of an intended application. The configurations provide means for determining the additional fiber length (AFL) need to obtain the benefits of such additional fiber, while avoiding bending losses.

Abstract: The invention relates to a splice protection device for spliced optical fibers and to a method particularly for providing an access point to an optical fiber cable in a dwelling unit of a multi dwelling unit. To facilitate mounting of a splice protection device, the splice protection device according to the invention comprises a first and a second tube, the second tube being arranged concentrically and slidable within the first tube, the first and second tubes being adapted to receive at least one spliced fiber. The present invention furthermore relates to a method for providing an access point to a provider optical cable in a dwelling unit of a multi-dwelling unit.

Abstract: A fiber optic cable comprises a plurality of elongated optical fiber units, each having an outer jacket containing multiple optical fibers. The optical fiber units are interconnected at intermittent bonding locations along an axial length of said trunk cable to form a sheathless bundle. The absence of a sheath makes the trunk cable thinner and lighter than typical trunk cable. In addition, each unit can serve as a horizontal cable at a selected branching location.

Abstract: Cables have reduced freespace, reduced tube diameters, and reduced strength member diameters. The cables are designed to pass robustness testing such as GR-20 while using smaller amounts of raw materials to produce.

Abstract: Disclosed is a reduced-diameter optical-fiber cable that possesses a high fiber count and a high cable fiber density.

Abstract: An optical cable includes a buffer tube housing at least one optical fiber, a sheath surrounding such buffer tube and at least one longitudinal strength member embedded in the sheath, in which at least one separation element is provided between a portion of the outer surface of the buffer tube and the inner surface of the sheath, laying in an axial plane not containing the at least one strength member.

Abstract: The present disclosure relates to a telecommunications cable having a layer constructed to resist post-extrusion shrinkage. The layer includes a plurality of discrete shrinkage-reduction members embedded within a base material. The shrinkage-reduction members can be made of a liquid crystal polymer. The disclosure also relates to a method for manufacturing telecommunications cables having layers adapted to resist post-extrusion shrinkage.

Abstract: Micromodule subunit cables are constructed to allow for ease of identification between optical fibers in differing groups of optical fibers. In one cable, a first group of fibers is located within a first subunit while a second group of fibers is located within a second subunit, both subunits being enclosed in a cable jacket.

Abstract: An optical fiber cable comprising a polymeric jacket and at least one elongated buffer tube having a substantially circular cross-section and at least one optical fiber disposed within the at least one buffer tube. The optical fiber cable further comprises at least one dummy rod having a substantially non-circular cross-section, wherein the cross-sectional area of each dummy rod is at least 10% less than the cross-sectional area of the at least one elongated buffer tube along a majority of the length of the at least one dummy rod.

Abstract: An underwater optical fiber cable includes two end portions, an extruded metal tube, at least one optical fiber and a polymeric sheath surrounding the extruded metal tube. The at least one optical fiber is housed in loose configuration in the extruded metal tube. The cable includes a controlled cathodic protection system connected to one of the end portions of the underwater cable and includes an anode bed arranged outside the underwater cable and an electric connection connecting the anode bed to the extruded metal tube of the underwater cable at one of the end portions of the underwater cable.

Abstract: In an optical cable 1, the ratio of the inner diameter ID to the outer diameter OD of a tube 20 is 0.5 or less, and thus the tube 20 has a comparatively thick wall. Consequently, even when the optical cable 1 is bent to a small bend radius of, for example, approximately 2 mm, a kink in a portion of the tube 20 corresponding to the inner side of the bending is suppressed. As a result, damage to a coated optical fiber 10 or an increase in transmission loss arising from the occurrence of a kink in the tube 20 is suppressed.

Abstract: A fiber optic cable includes a tube formed from a flame-retardant material, an optical fiber disposed in a cavity of the tube, and powder comprising flame-retardant particles. At least a portion of the powder is mechanically attached to a surface of the cavity, where the mechanical attachment of the powder allows a portion of flame-retardant particles of the powder to protrude beyond the surface and not be completely embedded therein.

Abstract: A rack cabling system including a rack having mounted thereon a first hardware component and a patch panel housing mounted on the rack adjacent the first hardware component. The patch panel housing populates no more than a three rack unit (RU space), the patch panel housing including a first end having cable pathway openings and a second end having connector elements mounted therein. The patch panel may have a first cable pathway opening located adjacent the first side of the housing and defining a primary position and a first connector element mounted on the second end and the first connector element having a first position corresponding to the primary position of the first cable pathway opening. Cable harnesses are routed with less than three bends of the cables between the first hardware component and the patch panel housing, so that the first cable harness is terminated at the first connector element in the first position.

Abstract: A manufacturing line includes an extruder and a dynamic caterpuller system located after the extruder along the manufacturing line. During manufacturing, a fiber optic assembly is produced, where the fiber optic assembly includes a tube containing at least on optical fiber. The tube is extruded via the extruder and loaded via the dynamic caterpuller, which includes a closed pipe through which passes a liquid and the fiber optic assembly. The flow rate of the liquid is different than the speed of the fiber optic assembly through the pipe such that drag is imparted on the fiber optic assembly by the liquid.

Abstract: Cables have armor including a polymer, the armor having an armor profile that resembles conventional metal armored cable. The armor provides additional crush and impact resistance for the optical fibers and/or fiber optic assembly therein. The armored cables recover substantially from deformation caused by crush loads. Additionally, the armored fiber optic assemblies can have any suitable flame and/or smoke rating for meeting the requirements of the intended space.

Abstract: Micromodule subunit cables are constructed to allow for ease of identification between optical fibers in differing groups of optical fibers. In one cable, a first group of fibers is located within a first subunit while a second group of fibers is located within a second subunit, both subunits being enclosed in a cable jacket.

Abstract: A loose tube optical fiber cable includes at least one cable unit. Each cable unit includes a plurality of loose, non-buffered optical fibers, a strength yarn at least partially surrounding the non-buffered optical fibers, and a jacket surrounding the strength yarn and the non-buffered optical fibers.

Abstract: An optical fiber cable includes at least one optical fiber element and a tight buffer coating on the optical fiber element, where the tight buffer coating on the optical fiber element includes a plurality of alternating splines and grooves facing outwardly towards the outer circumference of the tight buffer coating. Additionally, an optical fiber cable can have at least one optical fiber element and at least one buffer tube surrounding the optical fiber element, where the buffer tube around the optical fiber element includes a plurality of alternating splines and grooves facing outwardly towards the outer circumference of the buffer tube.

Abstract: An earth cable adapted for being laid underground includes at least one optical fiber, a thermally conducting polymeric layer surrounding the at least one optical fiber, and copper conductors arranged in a radially-external position with respect to the thermally conducting polymeric layer.

Abstract: A cable includes a channel with an aspect ratio that houses optical fibers therein. The cable includes first and second stranded conductors on opposing sides of the channel. The channel is arranged with respect to the stranded conductors so that the fibers assume low strain positions in the channel when the cable is bent.