Cao, Chang, Jingyao Lei, and Tongxin Niu. “Design and Optimization of Bismuth-Doped Fiber Amplifiers in the L+ Band (1600-1650nm)”. Highlights in Science, Engineering and Technology 72 (December 15, 2023): 468–473. Accessed June 2, 2026. https://drpress.org/ojs/index.php/HSET/article/view/13345.