Single-mode optical fiber having reduced bending losses

US8145025B2 · kind B2 · utility

Assignee

• Draka Comteq B.V. · NL

Inventors

• Louis-Anne de Montmorillon · Paris, FR
• Simon Richard · Palaiseau, FR
• Denis Molin · Draveil, FR
• David Boivin · Longjumeau, FR
• Marianne Bigot-Astruc · Marcoussis, FR
• Pierre Sillard · Le Chesnay, FR

Key dates

• Filing date: May 6, 2009
• Grant date: Mar 27, 2012
• Expiry date: May 9, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/02395
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A single-mode optical fiber includes a central core, an intermediate cladding, a depressed trench, and an external optical cladding. The central core has a radius r1 and a positive refractive index difference Δn1 with the optical cladding. The intermediate cladding has a radius r2 and a positive refractive index difference Δn2 with the optical cladding, wherein Δn2 is less than Δn1. The depressed trench has a radius r3 and a negative index difference Δn3 with the optical cladding. At a wavelength of 1310 nanometers, the optical fiber has a mode field diameter (MFD) between 8.6 microns and 9.5 microns and, at a wavelength of 1550 nanometers, the optical fiber has bending losses less than about 0.25×10−3 dB/turn for a radius of curvature of 15 millimeters. At a wavelength of 1260 nanometers, attenuation of the LP11 mode to 19.3 dB is achieved over less than 90 meters of fiber.