35 Core Polarization-Maintaining Multi-core Fiber for High Power Operation Yahia Khalil, Moritz Grimm, Arno Klenke, Mehran Bahri, Cesar Jauregui, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber and Jens Limpert EPJ Web Conf., 307 (2024) 02052 Published online: 18 October 2024 DOI: 10.1051/epjconf/202430702052