Sumitomo Electric Industries, Limited

Ryoei Oka

Ken Takahashi

Tomoyuki Hattori

Kohei Kobayashi

Kaoru Okuno

Toshihisa Sato

Fumiaki Sato

Takao Hirama

Yoshiaki Nagao

Taro Fujita

Nobumasa Nirasawa

Hironori Matsumoto

Kentaro Takeda

Saburo Yoshimura

Shigenori Takaki

Masayuki Okubo

Provided is an optical fiber cable that is easier to be laid and enables higher-density packaging than an existing cable. This optical fiber cable is a slotless type optical fiber cable including: an optical unit formed by collecting and twisting a plurality of optical fibers or ribbons each formed by arranging the plurality of optical fibers; a cable core housing the optical unit; and a cable jacket provided around the cable core, and a tension member made of a fiber body within the cable core.

Optical fiber cable

Provided is a polyethylene resin for use in a spacer for an optical fiber cable, the polyethylene resin having a density of 0.952 g/cmor more, containing a polyethylene having a molecular weight of 10,000 or less in a weight fraction of 22% or more, and containing a polyethylene having a molecular weight of 300,000 or more in a weight fraction of 12% or more.

Polyethylene resin for use in spacer for optical fiber cable and spacer for optical fiber cable using the same

A method of producing a synthetic resin rod (wire), comprising:

Methods of producing synthetic resin wire

In a method of making a ribbon type coated optical fiber comprising the step of inserting a plurality of optical fibers flatly arranged parallel to each other through a die orifice so as to collectively coat the optical fibers with a coating resin the ratio W/H of a clearance W in the width direction between the inner surface of the die orifice and the outer surface of the optical fibers to a clearance H in the thickness direction therebetween is set within the range of 1.0 to 2.5.

Method of producing tape type optical fiber core wire

In a split type ribbon optical fiber core cable capable of being split into cables, there are a plurality of ribbon optical fiber core cable units, each of which are constituted by a plurality of colored optical fiber core cables arranged in a row; a coating resin of an ultraviolet curable resin wholly coats the plurality of colored optical fiber core cables; and a bonding resin of an ultraviolet curable resin bonds the ribbon optical fiber core cable units arranged in a row. In this cable, an adhesion strength between the coating resin and the bonding resin is in the range of 1 to 100 g/cm. Further, the bonding resin after curing has a Young's modulus of from 5 to 100 kg/mm.sup.2. The bonding resin after curing has an elongation coefficient of from 5 to 80%.

Split type ribbon optical fiber core cable

An optical fiber ribbon is manufactured under a condition where, assuming that the optical fiber ribbon has a thickness of 2d (mm), a guide roller has a diameter of 2R (mm), and a period of time till the optical fiber ribbon comes into contact with the guide roller after leaving an ultraviolet irradiation apparatus is t (ms), a relationship of d/�(R+d).times.t!&lt;0.2 is satisfied. Accordingly, no damages are imparted to the optical fiber ribbon, and no micro-bendings occur in its coated optical fibers, whereby the transmission characteristic can be prevented from deteriorating.

Method of making optical fiber ribbon

In a method for producing an optical fiber ribbon, a plurality of coated optical fibers is fed out so that the plurality of coated optical fibers are arranged in a plane in a concentrator. A ribbon matrix composed of ultraviolet-curing resin is applied onto the plurality of coated optical fibers in a coater. Ultraviolet rays is radiated to cure the ribbon matrix. The plurality of coated optical fibers are arranged at intervals in a plane in the concentrator.

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Yokohama, Japan

Ryoei Oka