Thermal effects in Yb-doped double-cladding Distributed Modal Filtering rod-type fibers

E. Coscelli, F. Poli, Mette M. Joergensen, M. Laurila, J. Lægsgaard, T. Alkeskjold, L. Leick, J. Broeng, A. Cucinotta, S. Selleri
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Abstract

The effects of thermally-induced refractive index change in Yb-doped Distributed Modal Filtering (DMF) photonic crystal fibers are investigated, where high-order mode suppression is obtained by resonant coupling with high index elements in the cladding. The temperature distribution on the fiber cross-section is calculated with an analytical model, for different pump power values. The consequent refractive index change, due to the thermo-optical effect, is applied to the cross-section of the DMF fiber, whose guiding properties are studied with a full-vector modal solver based on the finite element method. A DMF fiber design, which is single-mode in the 1030 nm-1064 nm region, is considered, and the effects of thermal load on the transmission characteristics are evaluated. Results show a blue-shift of the single-mode window and the single-mode bandwidth narrowing as the absorbed pump power becomes higher.
掺镱双包层分布模态滤波棒型光纤的热效应
研究了热致折射率变化对掺镱分布式模态滤波(DMF)光子晶体光纤的影响,通过在包层中与高折射率元件的共振耦合实现了高阶模抑制。用解析模型计算了不同泵浦功率下光纤截面上的温度分布。将热光效应引起的折射率变化应用于DMF光纤的截面,利用基于有限元法的全矢量模态求解器研究了DMF光纤的导向特性。考虑了单模DMF光纤在1030nm ~ 1064nm范围内的设计,并评估了热载荷对其传输特性的影响。结果表明,随着吸收泵浦功率的增大,单模窗口发生蓝移,单模带宽变窄。
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