Abstract

Spatially resolved spectral interferometry is used to measure the mode content of a Yb-doped photonic-crystal fiber rod amplifier with a 2300μm2 mode area. The technique, known as S2 imaging, was adapted for the short fiber amplifier at full power and revealed a small amount of a copolarized LP11 mode. Simulations illustrate the potential for weak mode suppression in this fiber and agree qualitatively with the measurements of S2 and M2. Higher-order-mode content depends on the alignment of the input signal at injection and ranged from 18dB for optimized alignment to 13dB when the injection alignment was offset along the LP11 axis by 30% of the 55μm mode-field diameter.

© 2011 Optical Society of America

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