Media type: E-Article Title: Symmetry-Free Tm-Doped Photonic Crystal Fiber With Enhanced Mode Area Contributor: Coscelli, Enrico; Molardi, Carlo; Cucinotta, Annamaria; Selleri, Stefano imprint: Institute of Electrical and Electronics Engineers (IEEE), 2014 Published in: IEEE Journal of Selected Topics in Quantum Electronics Language: Not determined DOI: 10.1109/jstqe.2014.2299636 ISSN: 1077-260X; 1558-4542 Keywords: Electrical and Electronic Engineering ; Atomic and Molecular Physics, and Optics Origination: Footnote: