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25 W 2 μm broadband polarization-maintaining hybrid Ho- and Tm-doped fiber amplifier

: Tench, Robert E.; Romano, Clément; Delavaux, Jean Marc P.


Applied optics 58 (2019), No.15, pp.4170-4175
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Journal Article
Fraunhofer IOSB ()
fiber lasers

We report the design, evaluation, and performance of a polarization-maintaining (PM) fiber amplifier with a CW output power of >25  W at 2051 nm and a high input signal dynamic range of 34 dB at 25 W. To improve both the output power and dynamic range performance of previous amplifiers, we propose a PM hybrid design with a single-clad Ho-doped preamplifier (HDFA) followed by a double-clad Tm-doped power amplifier (TDFA). The role of the Ho-doped fiber preamplifier is to provide large input signal dynamic range, low noise figure, and moderate output power over an operating bandwidth from ≈2–2.1  μm. The role of the Tm-doped fiber power amplifier is to offer power amplification with good efficiency, taking full advantage of 2-for-1 ion–ion interactions, with the possibility of scaling up the output power to values much higher than 25 W. Our hybrid Ho-Tm-doped design provides a PM fiber amplifier with a combination of large input signal dynamic range, low noise figure, broad operating bandwidth, and high output power. Simulations of the hybrid HDFA/TDFA performance agree relatively well with experimental data.