Research / 2020 / Article / Fig 7

Research Article

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

Figure 7

Experimental setup of the RC-EDF-assisted OAM fiber amplifier in OAM-DM and WDM systems. The setup consists of five parts (transmitter, multiplexing of OAM modes, OAM fiber amplifier based on RC-EDF, demultiplexing of OAM modes, and receiver). ECL: external cavity laser; PC: polarization controller; I/Q modulator: in-phase/quadrature modulator; OC: optical coupler; Col.: collimator; Pol.: polarizer; PC-RC-EDF: polarization controller on RC-EDF; MMF: multimode fiber; LO: local oscillator; OSA: optical spectrum analyzer.