Broad-bandwidth multimode optical fiber having reduced bending losses

US8565568B2 · kind B2 · utility

Assignee

• Draka Comteq B.V. · NL

Inventors

• Marianne Bigot-Astruc · Marcoussis, FR
• Denis Molin · Draveil, FR
• Pierre Sillard · Le Chesnay, FR

Key dates

• Filing date: Mar 1, 2011
• Grant date: Oct 22, 2013
• Expiry date: Sep 11, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0365
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A multimode optical fiber includes a central core, an inner cladding, a buried trench, and an outer cladding (e.g., an outer optical cladding). Typically, the optical fiber's central core is a glass-based central core having an alpha-index profile (i.e., a graded-index profile), an outer radius r1, and a maximum refractive index difference Δn1 with respect to the outer cladding. The central core's alpha-index profile has a minimum refractive index at the central core's outer radius r1 that corresponds to a refractive index difference Δnend with respect to the outer cladding. The inner cladding has an outer radius r2, a width w2, and a refractive index difference Δn2 with respect to the outer cladding. The buried trench has an outer radius rext, a width w3, and a refractive index difference Δn3 with respect to the outer cladding. The multimode optical fiber typically has reduced bending losses, a high bandwidth at wavelengths of both 850 nanometers and 1300 nanometers, and a reduced cladding effect.