Pan Xiangping, Dong Yanhua, Wen Jianxiang, Shang Yana, Zhang Xiaobei, Huang Yi, Pang Fufei, Wang Tingyun
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, China.
Materials (Basel). 2022 Sep 2;15(17):6090. doi: 10.3390/ma15176090.
Er-doped optical fiber (EDF) with ultra-broad gain bandwidth is urgently needed given the rapid advancement of optical communication. However, the weak crystal field of the host silica glass severely restricts the bandwidth of traditional EDF at 1.5 μm. In this study, we theoretically explored the introduction of PbS nanomaterials in the silica network assisted with the non-bridging oxygen. This can significantly increase the crystal field strength of Er ions in the local structure, leading to their energy level splitting and expanding the fluorescence bandwidth. Additionally, the PbS/Er co-doped optical fiber (PEDF) with improved fluorescence and gain characteristics was fabricated using modified chemical vapor deposition combined with the atomic layer deposition technique. The presence of PbS nanomaterials in the fiber core region, which had an average size of 4 nm, causes the I energy level of Er ions to divide, increasing the fluorescence bandwidth from 32 to 39 nm. Notably, the gain bandwidth of PEDF greater than 20 dB increased by approximately 12 nm compared to that of EDF. The obtained PEDF would play an important role in the optical fiber amplifier and laser applications.
鉴于光通信的快速发展，迫切需要具有超宽增益带宽的掺铒光纤（EDF）。然而，主体石英玻璃的弱晶体场严重限制了传统EDF在1.5μm处的带宽。在本研究中，我们从理论上探讨了在非桥氧辅助的石英网络中引入硫化铅纳米材料。这可以显著提高局部结构中铒离子的晶体场强度，导致其能级分裂并扩展荧光带宽。此外，采用改进的化学气相沉积结合原子层沉积技术制备了具有改善的荧光和增益特性的硫化铅/铒共掺杂光纤（PEDF）。光纤纤芯区域中平均尺寸为4nm的硫化铅纳米材料的存在导致铒离子的I能级分裂，使荧光带宽从32nm增加到39nm。值得注意的是，与EDF相比，增益带宽大于20dB的PEDF增加了约12nm。所获得的PEDF将在光纤放大器和激光应用中发挥重要作用。
