Abstract

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 15.7 dB gain is obtained using a cladding pumped amplifier configuration for OAM modes with topological charge │l│ = 1 in the operational wavelength range 1545–1600 nm

© 2017 IEEE

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