Bend-insensitive single-mode optical fiber

US7889960B2 · 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: Feb 15, 2011
• Expiry date: May 6, 2029

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 refractive index difference Δn2 with the optical cladding, wherein Δn2 is less than the central core's refractive index difference Δn1. The depressed trench has a radius r3 and a negative index difference Δn3 with the optical cladding. The optical fiber has a nominal mode field diameter (MFD) between 8.6 microns and 9.5 microns at a wavelength of 1310 nanometers, and at a wavelength of 1550 nanometers, the optical fiber has bending losses less than 0.15 dB/turn for a radius of curvature of 5 millimeters and cable cut-off wavelengths of less than or equal to 1260 nanometers.