Patent ID: 9557483
Date: 2017-01-31
CPC Classifications: G02B

Claim:
1. A fibre coupler, comprising: a tubular enveloping structure; and a plurality of optical fibres arranged in the enveloping structure, each of which includes a fibre core and a fibre cladding surrounding same, in order to conduct laser radiation, and each of which extends from a first end as far as a second end of the enveloping structure, wherein the enveloping structure has a tapering section which is tapered in a first direction from the first as far as the second end, wherein, in the tapering section, both a first ratio of the diameter of the fibre core to the diameter of the fibre cladding and a second ratio of the diameter of the mode field of the laser radiation conducted in the optical fibre to the diameter of the fibre core increase in the first direction for each optical fibre, and wherein the thickness of the fibre cladding decreases in the first direction in order to increase the first ratio.