Abstract
A trench-assisted ring few-mode erbium-doped fiber amplifier (FM-EDFA) supporting eight spatial modes is designed and proposed in this work. The gain equalization for the FM-EDFA is achieved by selecting the appropriate doping radius and concentration using a particle swarm optimization (PSO) algorithm when only the pump in the fundamental mode (${{\rm LP}_{01}})$ is applied. When the signals in the eight spatial modes are simultaneously amplified, the average modal gain is about 20 dB, and the DMG is less than 0.3 dB for a signal at 1550 nm. Considering the gain competition of six wavelength signals, the modal gain and DMG are more than 20 and 1 dB, respectively. In addition, the tolerance analysis for manufacturing with this design is also discussed. For a fluctuation in the refractive index, the average modal gain is about 19.5 dB, and the DMG is 0.77 dB, indicating that the structure has good fabrication tolerance.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Qi Zhao, Li Pei, Jianjun Tang, Jianshuai Wang, Jingjing Zheng, Jing Li, and Tigang Ning
Appl. Opt. 62(6) 1567-1574 (2023)
Qi Zhao, Jianjun Tang, Yuheng Xie, Lipeng Feng, and Tianqi Dou
Appl. Opt. 62(17) 4482-4489 (2023)
Hirotaka Ono and Makoto Yamada
Appl. Opt. 62(16) 4180-4186 (2023)