Fujikura Limited

Afl Telecommunications Lcc

Other

Tokuyama Corporation

Matsuhiro Miyamoto

Naoki Okada

Masayoshi Yamanaka

Yoshio Hashimoto

Ryozo Yamauchi

Keiji Ohashi

Hirohito Watanabe

Osamu Fukuda

Kazunaga Kobayashi

Masahiro Kusakari

Michio Suematsu

Koichiro Watanabe

Yoshiyasu Satoh

Tatsuyuki Oohashi

Kazuo Hogari

Brian Herbst

Hideyuki Iwata

Brett Villiger

Shimei Tanaka

Hiroyuki Sawano

Masateru Ichikawa

Joe Cignarale

Craig Stratton

Masami Miyachi

Hideki Tanaka

Yasushi Nakakura

Takuya Fujimoto

Kazunari Suzuki

Akio Mogi

Akira Sano

Yutaka Kurosawa

John J D'Urso

Sean Foley

Yoshiyasu Sato

Jeffrey Jamieson

John D'URSO

Method and apparatus for producing metal-coated optical fiber involves feeding a length of glass fiber through a first solution bath so as to plate a first predetermined metal on the glass fiber via electroless deposition. The length of glass fiber is passed continuously from the first solution bath to a second solution bath adapted to plate thereon a second predetermined metal via electrolytic plating such that the optical fiber contacts an electrode only after at least some of the second predetermined metal has been applied. The length of glass fiber may be passed continuously from the second solution bath to a third solution bath adapted to plate thereon a third predetermined metal via electrolytic plating.

Method and apparatus for fabrication of metal-coated optical fiber, and the resulting optical fiber

Method and apparatus for producing metal-coated optical fiber involves providing a length of optical fiber having a glass fiber with or without a carbon layer surrounded by a liquid-soluble polymeric coating. The optical fiber is passed through a series of solution baths such that the fiber will contact the solution in each bath for a predetermined dwell time, the series of solution baths effecting removal of the polymer coating and subsequent electroless plating of metal on the glass fiber. The optical fiber is collected after metal plating so that a selected quantity of the metal-coated optical fiber is gathered, Preferably, the glass fiber passes through the series of solution baths without contacting anything except for the respective solution in each.

A sensing cable is provided which includes exposed and/or unexposed optical fibers or wires disposed through the length of the sensing cable. The sensing cable includes a slotted core which is a one-piece integral member having a plurality of channels formed on a perimeter of the slotted core and which extend along a length of the slotted core. The sensing cable includes at least one exposed component which is disposed in a first channel of the plurality of channels and which extends along a length of the first channel. The sensing cable includes at least one unexposed component which is encased by a protective member, and the unexposed component and the protective member are disposed in a second channel of the plurality of channels. The unexposed component and the protective member extend along a length of the second channel.

Sensing cable

A fiber optic sensor comprising a first light source, a second light source, a first optical coupler operatively connected with the first light source, and a second optical coupler operatively connected with the second light source. The first optical coupler directs first and second optical waves along a first optical path into first and second ends of an optical fiber such that the first and second optical waves interfere to form a first combined optical wave. The second optical coupler directs the third and fourth optical waves along a second optical path into the first and second ends of the optical fiber such that the third and fourth optical waves interfere to form a second combined optical wave. The second optical path is longer than the first optical path by a predetermined distance. Detectors receive the first and second combined optical waves and output information with respect thereto.

Optical fiber vibration sensor

An optical fiber drop cable includes an optical element portion having an optical fiber core wire and a pair of first tension members disposed parallel to the optical fiber core wire on both sides thereof in a sandwiching manner. The optical fiber core wire and the pair of first tension members are coated with a cable sheath. A long-scale cable support wire portion has a second tension member coated with a sheath. The optical element portion and the cable support wire portion are adhered parallel to each other. The first tension members are composed of a nonconductive material. A flexural rigidity of the optical element portion is in a range from 80 to 500 Nmm.

Optical fiber drop cable

An optical fiber drop cable is disclosed including an elongated optical element section composed of an optical fiber core wire and at least one pair of adjacent first tensile strength members, disposed on both sides of the optical fiber core wire in parallel thereto, which are covered with a cable sheath, and an elongated cable support wire section having a second tensile strength member covered with a sheath and adhered to the optical element section in parallel thereto. Since an outer periphery of the first tensile strength member is formed in a rugged configuration, an increased adhesive force is provided between the first tensile strength member and the cable sheath due to an anchoring effect of the rugged configuration.

The present invention's optical cable is provided with optical fibers, a forming pipe for housing the optical fibers, a sheath provided around the forming pipe, and at least one pair of rip cords embedded in the sheath. The forming pipe is formed of a plurality of tapes so that it is dividable along its longitudinal direction. When dividing the optical cable, the rip cords are pulled to tear open the sheath, and the already split forming pipe is divided while staying adhered to the respective parts of the sheath. As a result, the division of the sheath and the forming pipe is carried out in one stroke, so that the optical fibers inside the forming pipe can be exposed easily and quickly.

Optical cable having forming tape and rip cords

An optical cable formed by optical fibers, a forming pipe, a sheath, a pair of tension members, and a pair of rip cords. The forming pipe includes a plurality of tapes arranged to permit the forming pipe to be divided in the longitudinal direction and the rip cords are located near the seams of the forming pipe. A distance from the surface of the tension members to the inner surface of the sheath and to the outer surface of the sheath are both 0.3 mm or more. A distance from the center of the rip cords to the inner surface of the sheath is from 0.2-fold or greater to 1.2-fold or less than the radius of the tip cords. Furthermore, the distance from the surface of the rip cords to the seams of the forming pipes is 0.5 mm or less.

Optical cable

There is provided an optical-fiber; and a cylinder body which is made from a cylindrically formed belt-shaped material and made of resin and which accommodates the optical-fiber therein.

Optical-fiber cable and method of manufacturing the same

A resin composition comprises 100 parts by weight of an ethylene-base resin comprising at least 2 wt. % of linear low-density polyethylene and 0.1-30 parts by weight of an organopolysiloxane having an average molecular weight of at least 100,000. The resin composition can be produced by melting and kneading the organopolysiloxane together with the linear low-density polyethylene and then melting and kneading the resulting polymer blend together with the ethylene-base resin other than the linear low-density polyethylene. The resin composition may additionally comprise 0.1-100 parts by weight of a propylene-base resin. In the latter resin composition, the organopolysiloxane is contained in an amount of 0.1-30 parts by weight per 100 parts by weight of the sum of the ethylene-base resin and the propylene-base resin. The latter resin composition can be produced by melting and kneading the organopolysiloxane together with the propylene-base resin and then melting and kneading the resulting polymer blend together with the ethylene-base resin. Optical fiber feeding pipes and optical fiber units making use of such resin compositions are also described.

Resin compositions, production process thereof, and products using the

A loose tube optical fiber cable with SZ stranding in which the units receive two or more laminated multicase ribbons stranded toward a central member with the stranding direction reversed at specific intervals. These multicase ribbons are twisted in the same direction as the stranding of the tube units, and a reverse stranding angle of the tube units is selected to be a value within a specific scope.

Optical fiber cable containing ribbon fibers

Disclosed is a method of manufacturing a preform for an asymmetric optical fiber which comprises the steps of (a) fixing plural transparent glass rods involving at least one core-mother rod functioning as the core in said optical fiber in parallel relationship, (b) depositing glass soot around an assembly of said plural parallel fixed glass rods, thereby providing a single porous cladding bearing the predetermined shape, and (c) vitrifying the porous cladding by thermal fusion, thereby providing the entirely integral transparent preform. The above method does not involve any process of perforating a drilled-pore which is needed inevitably in conventional method. Therefore, it is possible to obtain a long preform with high dimensional precision, and to fabricate the optical fiber with low transmission loss.

Method of manufacturing a preform for asymmetrical optical fiber

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Chiba, Japan

Matsuhiro Miyamoto