Zhang Xi, Liu Jun, Chen Shi, Li Wei, Du Cheng, Wang Jian
Opt Lett. 2021 Nov 15;46(22):5647-5650. doi: 10.1364/OL.440098.
We propose and demonstrate an orbital angular momentum (OAM) fiber amplifier supporting 14 OAM modes based on a fabricated ring-core erbium-doped fiber (RC-EDF) with a tailored erbium-doped profile. Theoretical analyses and numerical simulations suggest that the proposed RC-EDF provides relatively uniform gain larger than 20 dB for all 14 modes. With a core pump configuration, we experimentally characterize the performance of the RC-EDF-assisted OAM fiber amplifier, which can acquire a high modal gain up to 33.4 dB and low differential modal gain less than 1.8 dB at the wavelength of 1550 nm. The obtained results indicate successful implementation of the RC-EDF-assisted OAM fiber amplifier for 14 OAM modes with favorable performance.
我们提出并展示了一种基于定制掺铒分布的环形芯掺铒光纤（RC-EDF）的支持14种轨道角动量（OAM）模式的OAM光纤放大器。理论分析和数值模拟表明，所提出的RC-EDF为所有14种模式提供了大于20 dB的相对均匀增益。采用纤芯泵浦配置，我们对RC-EDF辅助的OAM光纤放大器的性能进行了实验表征，该放大器在1550 nm波长下可获得高达33.4 dB的高模式增益和小于1.8 dB的低差分模式增益。所获得的结果表明成功实现了具有良好性能的用于14种OAM模式的RC-EDF辅助OAM光纤放大器。
