Optical fiber cable with large number of ribbon units containing optical fibers and enclosed in tubes
US5229851A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1992 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Apr 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/44384
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A plurality of optical fiber ribbons, each containing a plurality of optical fibers, are loosely enclosed in a substantially fluid impervious tube of plastic material. A plurality of such ribbon enclosing tubes are wound in S or Z fashion around a central structural member which can be covered with a plastic material. The so-wound tubes are encircled by threads or tape to hold them in place, and a covering of helically wound yarns is applied around the tubes to provide strength. A plastic sheath is applied over the yarns, and if desired the sheath is covered with other layers. Any otherwise empty spaces within the tubes and between the sheath and the tubes is filled with a water blocking material which permits the ribbons to move with respect to the enclosing tubes and which permits the tubes to move with respect to the sheath and the central member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.