Abstract

Amplification in a single-clad, large-mode-area erbium fiber as an alternative to double-clad Er-Yb amplifiers is presented. Both signal and pump are coupled through a mode-matched splice into the fundamental mode, which ensures preferential gain in the fundamental mode while minimizing the amplified spontaneous emission (ASE). The 875 μm2 effective area of the Er fiber enables amplification of 6 ps pulses at 1.55 μm wavelength by ~33 dB in a single stage to >25kW peak power with low nonlinear pulse distortion and a diffraction-limited output beam with M2<1.1.

© 2007 Optical Society of America

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