3 May 2013 Comparison of thermally-induced single-mode regime changes in Yb-doped large mode area photonic crystal fibers
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Abstract
Recently, the thermo-optic effect, which causes refractive index change in active optical fibers, emerged as one of the most limiting factor to power scaling of fiber lasers. The thermally-induced refractive index gradient in the fiber cross-section jeopardizes the extreme guiding properties required to obtain single-mode propagation in ultra Large Mode Area (LMA) fibers, eventually causing the rise of mode instabilities. In this paper the resilience to thermal effects of different rod-type Double Cladding Photonic Crystal Fiber designs, namely the 19-cell core, the distributed modal filtering and the large-pitch PCFs, have been compared through numerical simulations. The single-mode properties of each fiber have been obtained for different heating conditions. The causes of the different behavior have been investigated, providing a detailed overview of the influence of thermo-optical effects on the guiding properties of LMA PCFs, as well as some guidelines for the design of LMA PCFs for high-power applications.
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Enrico Coscelli, Enrico Coscelli, Federica Poli, Federica Poli, Riyadh Mwad Naife, Riyadh Mwad Naife, Annamaria Cucinotta, Annamaria Cucinotta, A. Hadi Al-Janabi, A. Hadi Al-Janabi, Stefano Selleri, Stefano Selleri, } "Comparison of thermally-induced single-mode regime changes in Yb-doped large mode area photonic crystal fibers", Proc. SPIE 8775, Micro-structured and Specialty Optical Fibres II, 87750N (3 May 2013); doi: 10.1117/12.2016858; https://doi.org/10.1117/12.2016858
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