Fujikura Limited

Masahiro Kusakari

Kazunaga Kobayashi

Keiji Ohashi

Shimei Tanaka

Matsuhiro Miyamoto

Takeshi Honjyou

Hirohito Watanabe

Ken Ohsato

Matsuhiro Miyamoato

The manufacturing apparatus for optical fiber cord is provided with an extrusion machine, a cooling chamber, an intermediate pulling device, a heating chamber, a final pulling device, and a winding machine wherein the machines, the devices and the chambers are disposed in this order. One or more optical fiber cores and one or more reinforcing fibers are sheathed with thermoplastic resin by the extrusion machine. The thermoplastic resin is solidified by cooling so as to be a resin sheath. The sheathed fibers are annealed by the heating chamber so that its residual stress is relieved.

Optical fiber cord, manufacturing method thereof, and manufacturing apparatus thereof

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 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.

An optical fiber ribbon cord comprising a plurality of tension fibers juxtaposed along about an optical fiber ribbon and a sheath composed of a resin covering all the exteriors thereof, wherein at least one tape body with higher Young's modulus than that of the sheath is inserted within the interior A of a side wall in the minor axis of the sheath.

Optical fiber cord and manufacturing method thereof

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.

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Chiba, Japan

Masahiro Kusakari