Higher order mode optical fiber Raman amplifiers. - Karsten Rottwitt; Soren Michael Mork Friis; Mario A. Usuga Castaneda; Erik N. Christensen; Jacob Gade Kofoed (ICTON, 2016)

12 Mode, MIMO-free OAM transmission. - Kasper Ingerslev; Patrick Gregg; Michael Galili; Francesco Da Ros; Hao Hu 009; Fangdi Bao; Mario A. Usuga Castaneda; Poul Kristensen; Andrea Rubano; Lorenzo Marrucci; Siddharth Ramachandran; Karsten Rottwitt; et al. (OFC, 2017)

Nonlinear Optical Signal Processing and Generation of Quantum States using Intermodal Four-wave Mixing. - Karsten Rottwitt; Mario A. Usuga Castaneda; Erik N. Christensen; Jesper B. Christensen; Jacob Gade Koefoed (ICTON, 2018)

A Novel Fabrication Method for Photonic Lanterns. - Neethu Mariam Mathew; Lars Gruner-Nielsen; Mario A. Usuga Castaneda; Karsten Rottwitt (OFC, 2018)

Polarization Dependence of Mode-Group Selective Air-Clad Photonic Lantern. - Neethu Mariam Mathew; Lars Gruner-Nielsen; Michael Galili; Mads Lillieholm; Mario A. Usuga Castaneda; Karsten Rottwitt (OFC, 2019)