51 W, 1.5 um, 7 WDM (25 nm) Channels PPM Downlink Transmitter and 500 W,1 um, Uplink PPM Transmitter for Deep Space Lasercom

摘要

This paper describes progress toward a space -based 51 W average power amplifier for deep space PPM and Earth GEOlinks. We demonstrated a broadband WDM amplification at 50W with flat gain across a 25 nm bandwidth. Similarly, for5 W amplifier we demonstrated a flat gain across a 32 nm bandwidth. These amplifiers demonstrate the feasibility formulti-channel space optical communications links. To increase the bandwidth GEO links to multi-Tbps and deep spacelinks to > Gbps. The laser supports kW/channel SBS limited peak power for PPM and achieves an optical-to-opticalefficiency of > 40%.In a separate but related effort for a deep space uplink beacon, we achieved 500 W average power, 2.6 kW peak powerPPM (2,2) for a 1 um uplink transmitter. Reliable SBS free operation is achieved with phase modulation resulting in 26GHz transmitter linewidth. Uplink transmitter is optimized for 65 usec (pulsewidth) slot size—achieving fastest possiblerise/fall times (<10 usec) and pulse uniformity.