Abstract: A cable, in particular for power transmission, for telecommunications or for data transmission, or also combined power/telecommunications cables, wherein at least one coating layer consists of a recyclable material which is halogen-free and has superior mechanical, electrical, and flame-retardant properties. This material consists of a polymer mixture comprising: (a) a crystalline propylene homopolymer or copolymer; and (b) a copolymer of ethylene with at least one alpha-olefin having from 4 to 12 carbon atoms, and optionally with a diene; the said copolymer (b) being characterized by a density of between 0.90 and 0.86 g/cm3 and by a Composition Distribution Index, defined as the weight percentage of copolymer molecules having an alpha-olefin content within 50% of the average total molar content of alpha-olefin, of greater than 45%. This material may also include a flame-retardant inorganic filler.
Type:
Application
Filed:
March 13, 2002
Publication date:
December 12, 2002
Applicant:
PIRELLI CAVI SISTEMI S.p.A.
Inventors:
Luca Castellani, Eduardo Grizante Redondo, Antonio Zaopo, Enrico Albizzati
Abstract: A method of forming a chirped fiber grating having the steps of providing an optical fiber, impressing a non-linear grating onto a portion of the optical fiber to define a non-linear variation in the refractive index. The method further comprising applying a temperature gradient to a portion of the optical fiber to provide a variation that acts against the non-linear variation in the refractive index.
Type:
Grant
Filed:
May 15, 2000
Date of Patent:
February 19, 2002
Assignee:
Pirelli Cavi & Sistemi S.p.A.
Inventors:
Richard Ian Laming, Martin Cole, Laurence Reekie