Abstract
We demonstrate a few-mode erbium-doped fiber amplifier employing a mode-selective photonic lantern for controlling the modal content of the pump light. Amplification of six spatial modes in a 5 m long erbium-doped fiber to average power is obtained while maintaining high modal fidelity. Through mode-selective forward pumping of the two degenerate modes operating at 976 nm, differential modal gains of between all modes and signal gains of at 1550 nm are achieved. In addition, low differential modal gain for near-full C-band operation is demonstrated.
© 2016 Optical Society of America
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