Gao Jiao, Yan Fengping, Ren Guobin, Guo Hao, Wang Baoyuan, Li Guangbo, Zhu Fuxi, Tan HaoYu, Feng Ting
Appl Opt. 2023 Dec 10;62(35):9274-9282. doi: 10.1364/AO.495215.
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 ( ) 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.
本文设计并提出了一种支持八个空间模式的沟槽辅助环形少模掺铒光纤放大器（FM-EDFA）。当仅施加基模（ ）泵浦时，通过使用粒子群优化（PSO）算法选择合适的掺杂半径和浓度，实现了FM-EDFA的增益均衡。当八个空间模式中的信号同时被放大时，对于1550nm处的信号，平均模式增益约为20dB，模式增益差（DMG）小于0.3dB。考虑六个波长信号的增益竞争时，模式增益和DMG分别大于20dB和1dB。此外，还讨论了该设计制造的容差分析。对于折射率的波动情况，平均模式增益约为19.5dB，DMG为0.77dB，表明该结构具有良好的制造容差。
