Fiber optic drop cable
US6256438A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Oct 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4431
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fiber optic cable that includes an armor layer having inner and outer surfaces and defining a passageway therethrough, a protective jacket surrounding the armor layer, a plurality of optical fibers extending lengthwise through the passageway, and a water swellable element for inhibiting water migration through the passageway. The water swellable element can be a water swellable layer on at least one of the inner and outer surfaces of the armor layer and/or a water swellable yarn extending through the passageway. The fiber optic cable is preferably tubeless, i.e., free of buffer tubes. In instances in which a water swellable layer is on the inner surface of the armor layer, the optical fibers are capable of contacting the water swellable layer. Alternatively, in instances in which the fiber optic cable includes water swellable yarns but not a water swellable layer on the inner surface of the armor layer, the optical fibers are capable of contacting the armor layer and, more particularly, the plastic coating of the armor layer. The fiber optic cable can exhibit shape retention whereby the fiber optic cable can retain a bent shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.