US 7,321,709 B2 | ||
Optical cable | ||
Tomoyuki Yokokawa, Yokohama (Japan); and Eisuke Sasaoka, Yokohama (Japan) | ||
Assigned to Sumitomo Electric Industries, Ltd., Osaka (Japan) | ||
Appl. No. 10/578,711 PCT Filed Nov. 11, 2005, PCT No. PCT/JP2005/020707 § 371(c)(1), (2), (4) Date May 10, 2006, PCT Pub. No. WO2006/051898, PCT Pub. Date May 18, 2006. |
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Claims priority of application No. 2004-327950 (JP), filed on Nov. 11, 2004. | ||
Prior Publication US 2007/0104429 A1, May 10, 2007 | ||
Int. Cl. G02B 6/44 (2006.01) |
U.S. Cl. 385—103 [385/100; 385/102] | 15 Claims |
1. An optical cable, comprising:
a tension member;
a tube comprised of one of plastic and metal, stranded together around said tension member, and containing one or more coated
optical fibers inside; and
an outer sheath covering an outer periphery of said tube,
wherein a ratio of A/B is 6.3 or more but 7.0 or less, where said each coated optical fiber has a mode field diameter A of
8.6±0.4 μm at a wavelength of 1.31 μm, and a fiber cutoff wavelength of said each coated optical fiber is B μm, and
wherein each of said coated optical fibers comprises a core region made of pure silica glass, and a cladding region made of
F-doped silica glass.
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