Stutzki, F.F.StutzkiJansen, F.F.JansenJauregui, C.C.JaureguiLimpert, J.J.LimpertTünnermann, A.A.Tünnermann2022-03-112022-03-112011https://publica.fraunhofer.de/handle/publica/37173410.1109/CLEOE.2011.5943148Dynamic waveguide properties have been observed in active Large Pitch Fibers depending on the pump power. A mode anticrossing is used to determine the strength of the index change at high power laser operation.en620conference paper