[3] Ren K Y, Shi W, Zhang Y T et al. Output power of erbium-ytterbium co-doped fiber amplifier after high temperature aging[J]. Acta Optica Sinica, 42, 0406002(2022).
[12] Liu Z L. Simulation of optical properties and optimal designing of photonic crystal fibers[D](2007).
[23] Lakshminarayana G, Qiu J R, Brik M et al. Spectral analysis of Er3+-, Er3+/Yb3+- and Er3+/Tm3+/Yb3+-doped TeO2-ZnO-WO3-TiO2-Na2O glasses[J]. Journal of Physics Condensed Matter, 20, 375101(2008).