Patent ID: 7321709
Filing Date: 2008-01-22
Classification: G02B

Abstract:
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.