Large mode area aperiodic fiber designs for robust singlemode emission under high thermal load

In this paper, we investigate the potential of various large mode area bers under thermal load, that is the state-of-the-art air-silica large pitch bers, as well as the recently devised symmetry-reduced photonic crystal ber and aperiodic all-solid by carefully considering the degrees of freedom o ered all along the ber fabrication. This work aims to discuss the mode ltering ability of these structures in regard to the power scaling and to con rm their potential for robust singlemode operation at high power level. Structural principles contributing to improve their performances such as the impact of air holes / solid inclusions size will be presented. We also intend to establish that the range of average absorbed/output power for which a robust singlemode operation is available can be shifted to ful l user requests in term of power range.