We are building a fiber-based master oscillator power amplifier (MOPA) laser transmitter architecture. The laser is a wavelength-locked, single frequency, externally modulated DBR operating at 1.57-micron followed by erbium-doped fiber amplifiers. The last amplifier stage is a polarization-maintaining, very-large-mode-area fiber with ~1000 μm2 effective area pumped by a Raman fiber laser. The optical output is single-frequency, one microsecond pulses with >450 μJ pulse energy, 7.5 KHz repetition rate, single spatial mode, and < 20 dB polarization extinction.
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Mark Stephen, Anthony Yu, Jeffrey Chen, Kenji Numata, Stewart Wu, Brayler Gonzales, Lawrence Han, Molly Fahey, Michael Plants, Michael Rodriguez, Graham Allan, James Abshire, Jeffrey Nicholson, Anand Hariharan, William Mamakos, Brian Bean, "Fiber-based laser MOPA transmitter packaging for space environment," Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 1051308 (20 February 2018);