Microstructured optical fibre having a large core and a flattened fundamental mode, production method thereof and use of same in laser microfabrication

US9244219B2 · kind B2 · utility

Assignees

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR
• UNIVERSITE DE LILLE 1 SCIENCES ET TECHNOLOGIES · FR
• CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE · FR

Inventors

• Emmanuel Hugonnot · Talence, FR
• Laure Lago · Le Barp, FR
• Arnaud Mussot · Lille, FR
• Yves Quimquenpois · Saint-André-lez-Lille, FR
• Géraud Bouwmans · Villeneuve-d'Ascq, FR
• Laurent Bigot · Hellemmes, FR
• Constance Valentin · Croix, FR

Key dates

• Filing date: Sep 18, 2012
• Grant date: Jan 26, 2016
• Expiry date: Sep 18, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49769
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The fiber comprises a core (2) having an index N and diameter of 10 μm or more, surrounded by a ring (4) having an index N+Δn and thickness ΔR, and cladding (6) surrounding the ring and comprising for example air gaps (8). According to the invention: Δn≧10−3 and ΔR=α/(Δn)β [1] where: 5×10−4 μm≦α≦5×10−2 μm and 0.5≦β≦1.5. The numbers α and β are dependent on the wavelength λ of the light guided by the fiber, the number of missing gaps therein, the diameter d of the gaps, the spacing Λ thereof and N. To design the fiber, λ, the number of missing gaps, d/Λ, the core doping content, Λ and Δn are chosen; and ΔR is determined using equation [1] so as to obtain a flattened fundamental mode.