Coscelli Enrico, Poli Federica, Alkeskjold Thomas T, Passaro Davide, Cucinotta Annamaria, Leick Lasse, Broeng Jes, Selleri Stefano
Information Engineering Department, University of Parma, Parma, Italy.
Opt Express. 2010 Dec 20;18(26):27197-204. doi: 10.1364/OE.18.027197.
Hybrid large mode area Ytterbium-doped double-cladding photonic crystal fibers with anti-symmetric high refractive index inclusions provide efficient amplified spontaneous emission spectral filtering. Their performances have been analyzed by numerical simulations and experimental measurements. In particular, the fiber single-mode behaviour has been studied, by taking into account the fundamental and the first higher-order mode. Two approaches, the core down-doping and the reduction of the air-hole diameter in the inner cladding, have been successfully applied to reduce the higher-order mode content, regardless of the bending of the doped fiber, without significantly affecting its spectral filtering properties.
具有反对称高折射率内含物的混合大模场面积掺镱双包层光子晶体光纤可提供高效的放大自发辐射光谱滤波。通过数值模拟和实验测量对其性能进行了分析。特别地，考虑到基模和一阶高阶模，研究了光纤的单模行为。两种方法，即纤芯向下掺杂和减小内包层气孔直径，已成功应用于降低高阶模含量，无论掺杂光纤的弯曲情况如何，且不会显著影响其光谱滤波特性。
