Sumitomo Electric Industries, Limited

Nippon Telegraph and Telephone Public Corporation

Shinichi Yonechi

Yukinori Ishida

Masaaki Kawase

An optical fiber cable comprising a core which comprises at least two filaments stranded, at least one optical fiber stranded around the core and a jacket around the optical fiber, wherein the strand pitch of the filaments of the core is greater than that of the optical fiber, in which the optical fiber contained is free from elongation strain when the cable is stretched.

Optical fiber cable

The present invention discloses several optical fiber cable constructions which basically dispose the optical fibers in a loosely-fitting fashion in respective longitudinal compartments provided by splicing tapes folded or shaped to a designated transverse cross-sectional shape. The loose fitting of the optical fibers overcomes the increased transmission losses and changed transmission bandwidth caused by lateral or compression forces inherently applied to the optical fibers of conventional optical fiber cable constructions. Two methods and apparatus for fabricating these optical fiber cable constructions are disclosed. In one embodiment, an assemblage die is stationary with respect to a rotary cage and a guide plate, whereas in a second embodiment the assemblage die is mounted to rotate with the rotary cage and the guide plate. In both embodiments the tape folding process for accommodating the fibers and the assemblage are achieved in tandem or in one operation.

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Yokohama, Japan

Shinichi Yonechi