We present for the first time broadband operation of an optical orbital angular momentum (OAM) erbium doped fiber amplifier for lower order OAM modes based on an air-hole erbium-doped fiber designed and fabricated to provide significant mode splitting between the OAM |l|=1 modes and the adjacent vector modes. Up to 15.7dB gain is obtained using a cladding pumped amplifier configuration for OAM modes with topological charge |l|=1 in the operational wavelength range 1545-1600nm.
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机译：我们首次展示了基于气孔掺b光纤的，用于低阶OAM模式的光学轨道角动量（OAM）掺do光纤放大器的宽带操作，该掺designed光纤被设计和制造为在OAM | l |之间提供显着的模式分离。 = 1个模式和相邻的矢量模式。对于在1545-1600nm工作波长范围内拓扑电荷| l | = 1的OAM模式，使用包层泵浦放大器配置可获得高达15.7dB的增益。
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