51W, 1.5um, 7 WDM (25nm) channels PPM downlink Tx and 500W, 1um, uplink PPM Tx for deep space lasercom

Doruk Engin; Joe Rudd; Khoa Le; Kent Puffenberger; He Cao; Nick Sawruk; Brian Mathason; Andrew Schober; Mark Storm

doi:10.1117/12.2513801

8 March 2019 51W, 1.5μm, 7 WDM (25nm) channels PPM downlink transmitter and 500W, 1μm, uplink PPM transmitter for deep space lasercom

Doruk Engin, Joe Rudd, Khoa Le, Kent Puffenberger, He Cao, Nick Sawruk, Brian Mathason, Andrew Schober, Mark Storm

Author Affiliations +

Proceedings Volume 10910, Free-Space Laser Communications XXXI; 109100L (2019) https://doi.org/10.1117/12.2513801
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

This paper describes progress toward a space -based 51 W average power amplifier for deep space PPM and Earth GEO links. We demonstrated a broadband WDM amplification at 50W with flat gain across a 25 nm bandwidth. Similarly, for 5 W amplifier we demonstrated a flat gain across a 32 nm bandwidth. These amplifiers demonstrate the feasibility for multi-channel space optical communications links. To increase the bandwidth GEO links to multi-Tbps and deep space links to > Gbps. The laser supports kW/channel SBS limited peak power for PPM and achieves an optical-to-optical efficiency of > 40%. In a separate but related effort for a deep space uplink beacon, we achieved 500 W average power, 2.6 kW peak power PPM (2,2) for a 1 μm uplink transmitter. Reliable SBS free operation is achieved with phase modulation resulting in 26 GHz transmitter linewidth. Uplink transmitter is optimized for 65 usec (pulsewidth) slot size—achieving fastest possible rise/fall times (<10 usec) and pulse uniformity.

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Doruk Engin, Joe Rudd, Khoa Le, Kent Puffenberger, He Cao, Nick Sawruk, Brian Mathason, Andrew Schober, and Mark Storm "51W, 1.5μm, 7 WDM (25nm) channels PPM downlink transmitter and 500W, 1μm, uplink PPM transmitter for deep space lasercom", Proc. SPIE 10910, Free-Space Laser Communications XXXI, 109100L (8 March 2019); https://doi.org/10.1117/12.2513801

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