Multimode optical fibers have been primarily (and almost solely) used as “light pipes” in
short distance telecommunications and in remote and astronomical spectroscopy. The …

This work presents a review on the effect of transverse mode instability in high-power fiber
laser systems and the corresponding investigations led worldwide over the past decade …

Four-mode multiplexing and manipulation technologies are reviewed in the context of space-
division multiplexing (SDM) optical communication systems. These are multiplane light …

Photonic technologies offer numerous functionalities that can be used to realize
astrophotonic instruments. The most spectacular example to date is the ESO Gravity …

This paper reviews characterization techniques for few mode fibers and components. The
focus is on interferometric techniques including spatial and spectral resolved imaging (S 2) …

The laser is one of the greatest inventions in history. Because of its ubiquitous applications
and profound societal impact, the concept of the laser has been extended to other physical …

We present a new technique allowing the fabrication of large modal count photonic lanterns
for space-division multiplexing applications. We demonstrate mode-selective photonic …

To overcome the capacity crunch of optical communications based on the traditional single-
mode fiber (SMF), different modes in a few-mode fiber (FMF) can be employed for mode …

We demonstrate for the first time, to the best of our knowledge, an all-fiber orbital angular
momentum (OAM) multiplexer that multiplexes both OAM modes of− l and+ l up to the …

Optical vortex beams that carry orbital angular momentum (OAM), also known as OAM
modes, have attracted considerable interest in recent years as they can comprise an …