Rochat, E.Dändliker, R.Haroud, K.Czichy, R. H.Roth, U.Costantini, D.Holzner, R.2009-04-222009-04-222009-04-22200110.1109/2944.9240122-s2.0-0034980103https://infoscience.epfl.ch/handle/20.500.14299/37836We report on the application of double-clad doped fiber amplifiers for coherent space communication systems using a master oscillator power amplifier (MOPA) design at 1.06 μm. The master oscillator is either a single-frequency Nd:YAG solid-state laser or a distributed-feedback fiber laser. The power amplifier is a diode-laser-pumped double-clad Nd doped fiber with polarization control, 20-dB gain, and about 1.3 W output power. A dual stage configuration using a solid-state Nd:YAG amplifier as second stage is presented as well, increasing the output power to 3.5 W with 28-dB gain. We also report on the possibility to integrate a single-frequency fiber laser, an all-fiber phase modulator, and a fiber amplifier to build an all-fiber phase-modulated MOPA. Up to 1 W continuous-wave output phase-modulated with a band-width of 196 MHz has been achieved.text::journal::journal article::research article