Sumitomo Electric Industries, Limited

Nippon Telegraph and Telephone Corporation

Yoshinobu Kitayama

Shigeru Tanaka

Hiroaki Sano

Yasunori Saito

Hiroki Ishikawa

Shigeru Tomita

Mikihiko Okano

Wataru Katurashima

Hiroyuki Akimoto

A method for installing and recovering transmission cable. A termination box has a stationary winding barrel having a central axis, and a transmission cable guide rotatably coupled to the stationary winding barrel for guiding a transmission cable onto and from the stationary winding barrel by being rotated around the central axis. Various methods show the step for winding and unwinding transmission cable from the termination box; as well as, use of the termination box in conjunction with a strength wire to install transmission cables between a transmission supply point and a transmission receiving point or points.

Transmission cable termination box, and transmission cable installation

Provided is an optical cable using multifiber optical units. Each of said multifiber optical units has a laminated body of a tape-type optical unit accommodated in a groove formed in a rod-like member. The tape-type optical unit is constituted by a plurality of optical fibers arranged in one row and coated collectively. The improvement is that the distance between the center of the rod-like member and a bottom portion of said groove is made to be equal to or larger than one half of the height of the laminated body to thereby reduce side pressure exerted on the tape type-optical units at the groove bottom portion thereof.

Optical fiber cable including plural multifiber optical units

A composite fiber-optic overhead ground wire having an optical unit which includes an optical fiber protecting tube, a spacer having helical grooves formed in its outer periphery, and multiple optical fiber units accommodated in the grooves of the spacer. Each of the optical fiber units includes multiple coated optical fibers formed of an optical glass fiber and a primary coating layer on the outer periphery of the optical glass fiber. The coated optical fibers are stranded around the outer periphery of a tension member. A first heat-resistant thin tape is wound in an overlapping manner around an outer periphery of the stranded coated optical fibers. The first heat-resistant thin tape is surrounded by a layer of interposition material which has a cushioning effect. A second heat-resistant thin tape is wound in an overlapping manner around the outer periphery of the interposition material.

Composite fiber-optic overhead ground wire

A composite overhead stranded conductor capable of accommodating a large number of coated fibers without having a large outside diameter, yet in which the transmission losses due to microbending are reduced. A protective tube is disposed around a spacer having a plurality of spiral grooves formed in its outer periphery for accommodating optical fibers. The optical fibers accommodated within each spiral groove are composed of a plurality of glass fibers having a primary coating layer and which are stranded together with a thin heat-resistant tape applied over the stranded fibers. The heat-resistant tape is applied longitudinally to the fiber strands, and wound therearound with overlapping side edges of the tape joined together. Otherwise the tape may be wound spirally around the fiber strands. Preferably, the tape has a melting point of not less than 200.degree. C. and a thickness of not more than 0.1 mm.

Composite overhead stranded conductor

A composite optical fiber overhead cable having improved long-term strength and loss characteristics. A plurality of optical fibers are accommodated in spiral grooves of the spacer around which conductor strands are wound. The fibers contain flourine in at least one of the core and cladding layers thereof. Each of the optical fibers is provided with a surrounding hermetic coat, and a heat-resistant elastic material is filled between each optical fiber and the bottom of its respective groove to restrain movement of the optical fibers in the grooves in the longitudinal direction.

Composite overhead transmission cable

A composite stranded conductor bundle in which one of the cable strands is a fiber optic unit having a protective tube enclosing a plurality of optical fibers. The protective tube is filled with a fiber filler to hold the optical fibers.

Composite overhead stranded conductor having a filler between optical

An improved composite overhead stranded conductor obtained by providing an optical fiber cable in an overhead power line formed by stranding a plurality of conductors, or in an overhead earth wire which is extended in parallel with such an overhead power line. A spacer having a plurality of axially extending helical grooves formed in an outer surface thereof is positioned within a protective tube. Respective optical fibers and/or optical bundles are received in each of the grooves. Each of the grooves has a width substantially equal to the outer diameter of the optical fiber and/or the optical bundles received therein so that movement of the optical fibers and/or the optical bundles in the grooves in the circumferential direction of the spacer is restricted.

Growing community of inventors

Kanagawa, Japan

Yoshinobu Kitayama