Patent ID: 7720340
Filing Date: 2010-05-18
Classification: G02B,H01S

Abstract:
1. A device for coupling multimode pump light and a laser signal into or out of a cladding-pumped fibre laser comprising an output optical fibre, a substantially un-tapered feed-through optical fibre, an annular waveguide having a tapered section, and a plurality of multimode pump fibres such that: the signal feed-through fibre is located within the annular waveguide; the signal feed-through fibre is fused into the annular waveguide in the tapered section so that the annular waveguide becomes an additional cladding layer of the feed-through fibre; the over-clad signal feed-through fibre is optically coupled to the output optical fibre; and the multimode pump fibres are optically coupled to the annular waveguide in the un-tapered section.