It's worth noting that the word "fibre" should be interpreted very loosely when it comes to high power lasers. They are often very specialised and in many cases

It's worth noting that the word "fibre" should be interpreted very loosely when it comes to high power lasers. They are often very specialised and in many cases more like "rods" i.e. held completely straight as even small bending would introduce enough loss to then cause the fibre to melt. That said you can deliver 100s of W with relatively off the shelf fibres.