Fujikura Limited

Nippon Telegraph and Telephone Corporation

Shimei Tanaka

Kazunaga Kobayashi

Keiji Ohashi

Satoru Shiobara

Masahiro Kusakari

Daiki Takeda

Naoki Okada

Keiichiro Sugimoto

Shinichi Niwa

Tadayoshi Sayama

Osamu Koyasu

Masashi Hara

Ken Osato

Matsuhiro Miyamoto

Katsuyoshi Endoh

Takeshi Honjyou

Ken Ohsato

Masashi Ohno

Takeshi Honjo

Matsuhiro Miyamoato

This optical fiber cable is provided with a covering resin including an outermost layer. The outermost layer is formed by a resin composition including: (a) a base resin prepared by adding at least one copolymer selected from an ethylene-vinyl acetate copolymer and an ethylene-ethyl acrylate copolymer to a high density polyethylene; (b) 25 to 90 parts by weight of a phosphate salt with respect to 100 parts by weight of the base resin; and (c) 0.75 to 15 parts by weight of either a silicone dispersed polyethylene or a silicone grafted polyethylene with respect to 100 parts by weight of the base resin.

Optical fiber cable for wiring in premises

An optical fiber cable includes an elongated optical element portion having an optical fiber, a pair of tensile strength members and an outer jacket. The optical fiber is composed of one or more plastic coated optical fibers, tight-buffered optical fibers or optical ribbon fibers. The pair of tensile strength members is arranged in parallel at both sides of the optical fiber in a width direction of the optical fiber. The outer jacket covers outer circumferences of the optical fiber and the pair of tensile strength members. A frictional coefficient of the outer jacket is equal to or less than 0.20. Shore D hardness of the outer jacket is equal to or more than 60.

Optical fiber cable and laying method thereof

A cable wherein even when there is a substantial volume of cable identifying information for identifying the cable, all of that cable identifying information can be simply and speedily written-in. This cable has a cable core, an integrated member with a chain of RFIDs including a plurality of RFID elements arranged at suitable intervals along a longitudinal direction of the cable core, to and from which cable identifying information can be written-in and read-out by transmission of electromagnetic energy, and a transmission coaxial cable for collectively writing-in cable identifying information to all of the RFID elements.

Cable

An optical fiber cable including a slotted core () having a suitable number of slots () and identification members () disposed in a designated slot (B) of the slots () for identifying cable information.

Identification member in slots in the core of an optical fiber cable

An optical fiber drop cable is provided with a neck portion in which an optical element section and a cable support section may be separated readily. The optical fiber drop cablecomprises the optical element sectionincluding an optical fiber core wire, at least one pair of first tensile strength bodiesdisposed in parallel to said optical fiber core wire in between, said optical fiber core wire and said first tensile strength bodies being covered with a cable sheath, and the cable support sectionincluding a second tensile strength bodycovered with a sheath, and the optical element sectionand the cable support sectionbeing fixed in parallel to each other via a neck portion. The neck portionincludes a thick partformed on the cable support sectionside and a thin part, which is thinner than the thick part, formed on the optical element sectionside next to the thick part

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.

An optical drop cable includes an optical element portion having an optical fiber core wire and at least one pair of first tension bodies covered with a cable sheath. A support wire portion includes a second tension body covered with a sheath. Both portions are fixed together. The first tension bodies are composed of a flexible plastic material.

Optical fiber drop cable and manufacturing method thereof

The present invention is provided for obtaining an apparatus and a method for accurately measuring a variation of a distortion of an optical fiber by excluding an apparent variation of the distortion of the optical fiber which is generated by a drift of a BOTDR waveform. The distortion measuring apparatus of the present invention comprises a sensor cable and a reference fiber which is connected with the sensor cable in series. The measured variation of the distortion of the sensor cable is corrected by subtracting the apparent variation of the distortion of the reference fiber from the measured variation of the distortion of the sensor cable. It is preferable that the reference fiber be housed in an thermostatic chamber and temperature of the reference fiber be maintained in a predetermined value within a range of 10 to 40&deg; C. with an error of &plusmn;2&deg; C.

Growing community of inventors

Sakura, Japan

Shimei Tanaka