Low macrobending loss single-mode optical fibre

US9279935B2 · kind B2 · utility

Assignee

• Prysmian S.p.A. · IT

Inventors

• Silvio Frigerio · Milano, IT
• Ricardo Antunes De Camargo · Milano, IT
• Lidia Terruzzi · Milano, IT

Key dates

• Filing date: Dec 23, 2010
• Grant date: Mar 8, 2016
• Expiry date: Aug 12, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2203/24
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A single-mode transmission optical fiber includes a central core region radially outwardly from a centerline to a radius r1 and having a positive relative refractive index Δ1; a first inner cladding region extending radially outwardly from the central core to a radius r2 and having a negative relative refractive index Δ2; a second inner cladding region extending radially outwardly from the first inner cladding region to a radius r3 and having a non-negative relative refractive index Δ3; an intermediate cladding region extending radially outwardly from the second inner cladding region to a radius r4 having a negative relative refractive index Δ4 larger in absolute value than the relative refractive index Δ2; and an outer cladding region extending radially outwardly from the intermediate cladding region and having a non-negative relative refractive index Δ5; wherein the relative refractive index Δ2 of the first inner cladding region is −0.1·10−3 to −1.0·10−3 and the relative refractive index Δ4 of the intermediate cladding is −3.0·10−3 to −5.0·10−3.