Research / 2020 / Article / Fig 2

Research Article

Amplifying Orbital Angular Momentum Modes in Ring-Core Erbium-Doped Fiber

Figure 2

Measured amplified spectra, intensity distributions, interferograms, and demodulation of OAM modes for the RC-EDF-assisted OAM fiber amplifier. (a, b) Measured amplified spectra for OAM+1 (a) and OAM-1 (b) modes at the output of the RC-EDF-assisted OAM fiber amplifier. The pump power is 550 mW. (c–e) Measured intensity profiles, interferograms, and demodulation of OAM modes at wavelengths of 1540 (c), 1550 (d), and 1560 nm (e). Left: OAM+1 mode; Right: OAM-1 mode.