title: Self-focusing in multicore fibers.
abstract: Self-focusing is the ultimate power limit of single mode fiber amplifiers. As fiber technology is approaching this limit, ways to mitigate self-focusing are becoming more and more important. Here we show a theoretical analysis of this limitation in coupled multicore fibers. Significant scaling of the self-focusing limit is possible even for coupled multicore fibers if the out-of-phase mode is chosen. On the other hand the in-phase mode can - depending on the coupling strength - be prone to instabilities.
authors.forename: Henrik
authors.initials: H
authors.lastname: Tünnermann
authors.forename: Akira
authors.initials: A
authors.lastname: Shirakawa