Dielectric optical fiber cable having reduced preferential bending
US6778744B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Sep 25, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/44384
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical cable (10) includes one or more tubes (120), each containing a number of optical fibers (101), and a plastic jacket (160) that encloses the tube(s). A pair of diametrically opposed rods (300-1, 300-2) are at least partially embedded in the polyethylene jacket and are made from continuous-filament glass fibers that are embedded in epoxy. Each rod has a compressive stiffness that is effective to inhibit substantial contraction of the cable, and a tensile stiffness that is effective to receive tensile loads without substantial transfer of such loads to the glass fibers. Each dielectric rod includes a thin layer (330) of a frictional adhesion coating that provides a controlled adhesion between the rod and the jacket of between 50 and 300 lb./in2. Whereas dual-rod cable designs have a preferred bending plane that passes through the rods, controlled adhesion between the rods and the jacket enables the cable to be easily bent in other planes and to be blown through ducts having multiple corners.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.