51W average power, 7 Channel WDM Fiber Laser Transmitter with 25nm flat gain has been demonstrated for optical space communication applications. Power Amplifier supports >10kW/channel SBS limited peak power and achieves o-o efficiency 44%. Pulse energy variation (PEV) due to gain dynamics and four wave mixing of the PPM tx output is characterized. Significant improvement in PEV with wavelength dependent pre-pulse shaping is demonstrated. A high reliability 50W 8 WDM channel amplifier design is described. The amplifier will be housed in a high TRL small SWAP space laser package with dimensions 10.6x13.8x 5.3” and weighs 28.7 lbs
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