Optical cable

Details Optical cable Optical cable

2008-01-22

2008-01-22

Doan, Jennifer (Department: 2874)

Optical waveguides

Optical transmission cable

Tightly confined

C385S100000, C385S102000

Reexamination Certificate

active

07321709

ABSTRACT:
An optical cable according to the present invention relates to an optical cable having a construction to enable reduction of a cable outer diameter, and/or improvement of contained efficiency of coated optical fibers while an increase of transmission loss in each coated optical fiber is suppressed. The optical cable has a loose-tube type of structure constructed by: a tension member; a plurality of tubes stranded together around the tension member; and an outer sheath covering the outer periphery of the plurality of tubes. One or more coated optical fibers are contained in each tube. A ratio of A/B is 6.3 or more but 7.0 or less, where each coated optical fiber has a mode field diameter A in a range of 8.6±0.4 μm at a wavelength of 1.31 μm, and where a fiber cutoff wavelength thereof is B μm.

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C. Unger et al., “Investigation of the Microbending Sensitivity of Fibers”, Journal of Lightwave Technology, 1994, pp. 591-596, vol. 12, No. 4.
Mahlke et al. “Fiber Optic Cables”, Publicis MCD Corporate Publishing, 2001, 121-132.
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“Ultra-low loss and bend insensitive pure-silica-core fiber complying with G.652 C/D and its applications to a loose tube cable”, 53rd IWCS/Focus Conference, Proceedings of the International Wire & Cable Symposium, Nov. 2004.
Unger et al., “Investigation of the Microbending Sensitivity of Fibers, Journal of Lightwave Technology”, vol. 12, No. 4, pp. 591-596, Apr. 1994.
Mahike et al., “Fiber Optic Cables”, Publics MCD Coporate Publishing (2001), pp. 121-123.
Yamamoto et al., “Water-Free Pure-Silica-Core Fibre”, ECOC 2004 Proceedings vol. 4, Paper Th2.3.1 pp. 844-847.
Yokokawa et al., “Ultra-low loss and bend insensitive pure-silica-core fiber complying with G.652 C/D and its applications to a loose tube cable”, 53rdIWCS/Focus Conference, Proceedings of the International Wire & Cable Symposium, Nov. (2004).
English Translation of International Preliminary Report on Patentability for International Appln. No. PCT/JP2005/020707, dated May 24, 2007.

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