Abstract: One or a plurality of reverse-lay grooves the direction of which is inverted periodically are cut in the outer circumference of a spacer, and an optical fiber tape unit or a stack of optical fiber tape units is accommodated in this groove. The length of the diagonal lines of the optical fiber tape unit or a stack of optical fiber tape units is larger than the width and depth of a bottom portion of the groove. In the inverted portion of the groove, the normal vector of the optical fiber tape unit or the stack of optical fiber tape units points to a direction perpendicular to an opening direction of the groove in the inverted portions of the groove.

Abstract: The present invention include type a risin-packed type fiber unit having an inner layer unit packing member through which a plurality of optical fiber cores are put, and an outer layer unit packing member formed on the outer surface of the inner layer unit packing member, and the resin which constitutes the outer layer unit packing member has a tear elongation ratio of 3.0 to 4.5%.

Abstract: An electromagnetic surface wave guideline that is formed by intertwisting dielectrics while providing a periodic structure like a rope and arranging conductors in a period harmonizing with the structure, and is suitable for such a use that entry of various objects including human beings and animals into a specific area for instance, and an object detecting device using the guideline

Abstract: A marine tow cable has both coaxial electronic and fiber optic data transsion capabilities wherein the coaxial core conductors are positioned at the neutral axis or center line of the cable with the coaxial shield conductor circumscribing a dielectric material therebetween. Embedded within the dielectric material matrix, separating the core conductors and the shield conductor, are fiber optic transmitters helically circumscribing the core conductors. Surrounding the electro-optical assembly is a watertight jacket and a protective armor cover to carry the tensile forces imparted to the cable during towing operations.

Abstract: The present invention relates to an optical fiber cable which includes magnetically locatable materials within the sheath system thereby allowing the cable to be located after it has been buried. More specifically, at least a portion of the magnetic particles are purposely oriented in a particular alignment based on their magnetic properties. Such an arrangement not only allows the generation of a detection signal which is distinguishable from that generated by a solid metallic pipe, but also can greatly enhance the level of the detection signal generated. The enhanced detection signal provides for more reliable detection of buried all-dielectric cables and also allows them to be located even when buried at greater depths, such as six feet or more. In specific embodiments of the present invention, the magnetic particles may be aligned and/or magnetized either longitudinally, vertically or transversely relative to the cable.

Abstract: A strain relief boot (10) in combination with a connector (15). The strain relief boot (10) has a body (11) having a rigid portion (12) and a flexible portion (13). A center bore (14) extends through the body (11) and the connector (15) is slidingly disposed in the center bore (14). The body (11) has an inner wall (20) surrounding the center bore (14). A plurality of spaced-apart ribs (21) are formed on the inner wall (20) of the rigid portion (12). Each rib (21) has a top surface (22) and a pair of adjoining sidewalls (23). The ribs (21) extend inwardly into the center bore (14) and grip the connector (15) with a friction fit, retaining the strain relief boot (10) on the connector (15).

Abstract: A composite optical cable for lateral emission of light flux therefrom includes a plural number of sets of transparent optical fibers with each set of fibers assembled into a single cable and with a plurality of single cables assembled in the composite optical cable. The sets of optical fibers forming the single cables may be wound in one direction of rotation to form a spiral of fibers with length, and the single cables may be wound in the opposite direction of rotation to provide the composite optical cable. Selected masking schemes provide apertures at predetermined locations along the single cables through which light flux carried by the cables may be emitted for special lighting effects.

Abstract: An optical fiber composite ground wire according to the present invention has a metal protective tube containing a grooved conductive spacer. The optical fiber cyomposite ground wire is characterized by further including a water absorption tape 3 wound around the outer surface of a spacer 1 to partly expose the spacer 1, wherein the protective tube 2 is brought into direct contact with the spacer 1 partly exposed from the water absorption tape 3, thereby electrically connecting the spacer 1 to the protective tube 2.

Abstract: A high-strength, waterproof cable capable of transmitting large quantities of information over great distances in a reliable and durable fashion and a method of making the cable is provided. The cable includes a first central core portion having a pair of opposed ends, with each end having a locking surface. The cable further includes a second central core portion having a pair of opposed ends, each end having a locking surface. The second core portion is sealed to the first core portion by engagement of the respective locking surfaces. The sealed first and second core portions form a central core having a hollow interior chamber. A water-blocking material is located in the sealed chamber and an optical fiber array is located in the sealed chamber and embedded in the water-blocking material. A multiplicity of high tensile strength steel wires are helically wrapped around the core and a thermoplastic jacket is positioned outwardly of and surrounding the steel wires.

Abstract: A composite optical cable for lateral emission of light flux therefrom includes a plural number of sets of transparent optical fibers with each set of fibers assembled into a single cable and with a plurality of single cables assembled in the composite optical cable. The sets of optical fibers forming the single cables may be wound in one direction of rotation to form a spiral of fibers with length, and the single cables may be wound in the opposite direction of rotation to provide the composite optical cable. Selected masking schemes provide apertures at predetermined locations along the single cables through which light flux carried by the cables may be emitted for special lighting effects.

Abstract: An optical fiber cable (20) includes a core (22) which includes a plurality of bundles (31, 31 ) of optical fiber (24) and a yarn-like strength member system (35) which is wrapped with an oscillated or unidirectional lay about the optical fibers. The strength member system also provides impact resistance for the fibers. A jacket (40) which may include a flame-resistant plastic material encloses the core with the outer diameter of the jacket being substantially less than that of typical optical fiber cables. Portions of the strength member system contact an inner surface of the jacket, an outer surface of which is the outer surface of the cable.

Abstract: Disclosed is a fiber optic cable in which a plurality of buffer tubes each contain optical fibers and a filling compound. The cable outer jacket and the coating on a central member are each made from a flame resistant plastic material. The cable has an NEC listing of OFNR.

Abstract: A fiber optic cable (10) suitable for lateral illumination lighting installations has a tubular central core (12), wrapped perimetrically with angularly evenly distributed bundles (15) of optical fibers (16) and covered with a transparent sheath (17). The core includes an outer cylindrical surface (14) of reflective material (24) that deflects inwardly directed lateral emissions back outwardly, so they can contribute usefully to the visible light. In manufacture, the bundles are wound about the core by a cabling machine which simultaneously extrudes the sheath about the winding. In a modified embodiment, a cable (10') includes an arcuate cutout (30) that mates with a complementary track (39, 40) of a mounting strip (35) . Strip (35) includes a reflective substance in an area (38) between upper and lower cables (10') to present a continuous, top to bottom lateral illumination effect.

Abstract: An optical fiber cable (20) includes a longitudinally extending copper core member (34). The core member is formed with at least one groove (36) in which is disposed at least one optical fiber. The optical fiber is coupled sufficiently to the core member preferably by an ultraviolet light energy cured material to substantially inhibit relative movement between the optical fiber and the core member when forces are applied to the cable. A sheath system which includes a plastic jacket (112) is disposed about the core member. The sheath system includes a strength member system which includes longitudinally extending copper wires (105, 105) and steel wires (101, 107). Disposed about the steel and copper wires is a steel shield (110) which provides hermetic protection for the optical fibers.

Abstract: An optical fiber cable (20) includes a longitudinally extending core member (34) which may be made of a plastic material. The core member is formed with at least one groove (36) in which is disposed at least one optical fiber (28). The optical fiber is coupled sufficiently to the core member, preferably by an ultraviolet light energy cured material, to inhibit substantially relative movement between the core member and the optical fiber when forces are applied to the cable. A sheath system which includes wire-like strength members and a plastic jacket (112) is disposed about the core member. A waterblocking material (108) disposed within interstices among the wire-like strength members and between an inner layer of the strength members and the core member causes coupling between the wire-like strength members and the core member.

Abstract: An armored fiber optic cable is disclosed having both fiber optics and ar wires located outside the cable core in position where the fiber optics experience low strain when the cable is under stress. In one embodiment, metal armor wires and optical fibers embedded in metal tubes are arrayed in one or more layers about and outside the cable core. In another embodiment, KEVLAR armor wires and optical fibers embedded within a hard composite shell are arrayed in one or more layers about and outside the cable core, and a layer of KEVLAR armor is provided surrounding the one or more layers. In each of the embodiments the strains that the fiber optics experience due to core stresses and due to core residual strain is materially reduced over the heretofore known armored fiber optic cables.

Abstract: A sheathed optical fiber (15) which may be used in a package (20) in guidance systems for tethered vehicles includes a carrier (21) on which are wrapped a plurality of convolutions of the sheathed optical fiber. The sheathed optical fiber in a preferred embodiment includes a metallic tubular member (40) with optical fiber (30) being disposed in a longitudinally extending passageway (42) of the tubular member and secured therein against unintended lateral disassociation with the tubular member in a manner which minimize microbending losses. The reinforced optical fiber has mechanical ruggedness and tensile load capability which render it ideal for use in tethered vehicles.

Abstract: A drawing head for ribbon type optical cables having optical fibres in ribbons with respective end connectors, a central strength member and a grooved core includes a drawing member connected at one end thereof to the axial strength member of the cable and at the other end thereof to a pulling and grasping member, which drawing member is surrounded by a flexible body. The drawing member has a length corresponding to a predetermined fibre ribbon length required for establishing cable connections, and the flexible body is provided with grooves adapted to accommodate the fibre ribbons disposed in alignment with the grooves of the cable core. The flexible body is followed by a deformable supporting body surrounding the drawing member and which can be deformed by the connector to provide longitudinally separated and aligned recesses for receiving the end connectors of the ribbons of each ribbon group accommodated in a given groove.

Abstract: A joint, and a method for forming such joint, between two optical fiber cables or cores having closed-helix grooves each loosely receiving at least one optical fiber. A cylindrical body having open-helix grooves is interposed between the two cores so that the latter grooves interconnect corresponding grooves of the cores. The ends of the optical fibers are joined, and the fibers are then placed in the grooves of the cylindrical body.

Abstract: In the manufacture of a fiber reinforced plastic armored cable, long reinforcing fibers are impregnated with an uncured thermosetting resin and formed into a predetermined shape to obtain a plurality of rod-like members with the thermosetting resin held uncured. Then the uncured rod-like members are passed through a die of a melt extruder, by which the rod-like members are each coated with a thermoplastic resin layer. The coated layers of the rod-like members are immediately cooled to simultaneously form a plurality of fiber reinforced plastic armoring strands with the thermosetting resin held uncured. The armoring strands thus obtained are wound around a cable which is fed while being rotated. The cable having wound thereon the strands is passed through a die portion of a melt extruder, by which the cable is sheathed with a thermoplastic resin layer which is immediately cooled and solidified.

Abstract: Disclosed is a tube holding optical fibers or optical ribbons, the tube having indentations in its inner and outer surfaces. The indentations are adjacent to better enable opening of the tube to gain access to the ribbons.