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.

Comparison of thermally-induced single-mode regime changes in Yb-doped large mode area photonic crystal fibers / Coscelli, Enrico; Poli, Federica; R., Mwad Naife; Cucinotta, Annamaria; H., Al Janabi; Selleri, Stefano. - (2013), p. paper 8775-23. (Intervento presentato al convegno SPIE Optics and Optoelectronics 2013 tenutosi a Prague, Czech Republic nel April 15-18, 2013) [10.1117/12.2016858].

Comparison of thermally-induced single-mode regime changes in Yb-doped large mode area photonic crystal fibers

COSCELLI, Enrico;POLI, Federica;CUCINOTTA, Annamaria;SELLERI, Stefano
2013-01-01

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.
2013
Comparison of thermally-induced single-mode regime changes in Yb-doped large mode area photonic crystal fibers / Coscelli, Enrico; Poli, Federica; R., Mwad Naife; Cucinotta, Annamaria; H., Al Janabi; Selleri, Stefano. - (2013), p. paper 8775-23. (Intervento presentato al convegno SPIE Optics and Optoelectronics 2013 tenutosi a Prague, Czech Republic nel April 15-18, 2013) [10.1117/12.2016858].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2619855
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