Microstructured Optical Fibre Having A Large Core And A Flattened Fundamental Mode, Production Method Thereof And Use Of Same In Laser Microfabrication

Method for producing the microstructured optical fibre having a large core and a flattened fundamental mode wherein the core diameter equals at least 10 μm, and a ring surrounding the core, wherein the optical index exceeds that of the core by a value Δn and wherein the outer radius exceeds the inner radius by a value ΔR, and an optical cladding surrounding the ring, and a matrix containing inclusions wherein the optical index is different to that of the matrix, the equivalent mean optical index nFSM of the cladding being less than the optical index of the core, comprising the steps of:

• choosing the λ values;
• choosing the number of missing inclusions;
• choosing the ratio d/Λ;
• choosing the doping content T of the core with T being greater than or equal to 0;
• choosing the Λ values;
• choosing the Δn values;
• determining ΔR using said equation so as to obtain a flattened fundamental mode at the fibre output when light having a wavelength λ is injected at the input thereof;
• and
• producing the microstructured optical fibre with the number of inclusions and parameters d, T, Λ, Δn thus chosen, and the parameter ΔR determined in this way.