50w, 1.5um, 8 Wdm (25nm) Channels Ppm Downlink Tx For Deep Space Lasercom

Fibertek has developed a space qualifiable 50W 8Ch. WDM Amplifier prototype that is designed to meet all the environmental and optical requirements of a DSOC mission. The deliverd amplifier is optimized for efficiency and athermal performance achieving 22% e-o efficiency. The high TRL 1.5-um high TL fiber amplifier supports up to 6W/channel, with >128-ary pulse-position-modulation (PPM) format, and with 25-nm gain-flat bandwidth. Output electro-optic characteristics, the System Reliability Analysis, Mechanical Thermal analysis and Mechanical Structural & Vibration analysis of the high TRL delivered laser prototype are presented. A power efficient TDM based FWM mitigation technique that improves PEV performance of Tx, is demonstrated.