We present a single-mode, polarization-maintaining, Er/Yb-codoped cladding-pumped
amplifier with up to 49 dB of gain, 13W output power, a 30 dB polarization-extinction ratio,
12.9% electrical to optical conversion efficiency, and 42% optical-optical power-stage fiber slope
efficiency. This is the most efficient highest PER HPOA ever reported near 1550 nm. The HPOA
was built using all fiber-based components qualifiable for long missions in harsh environments.
© 2006 Optical Society of America