Publications
Capacity-based analysis of physical-layer and link-layer techniques for reliable communication over free-space optical fading channels
Summary
Summary
Free-space optical communication links can experience signal power fluctuations due to channel effects such as turbulence and pointing jitter. Systems can ensure reliable, error-free communication over fading channels by using physical-layer techniques (e.g., forward error correction with codeword interleaving) and link-layer techniques (e.g., erasure coding or ARQ). In this work...
Design and performance of a 40W uplink laser transmitter for NASA's O2O laser communications mission
Summary
Summary
NASA's Orion Artemis II Optical Communications System (O2O) will provide operational laser communications between the ground and lunar orbit for the Artemis II crewed mission. In this work we describe a 40 W ground-based laser transmitter for the O2O system. The uplink transmitter operates in the optical C-band and uses...
On-orbit pointing performance of the Modular Agile Scalable Optical Terminal (MAScOT) for the ILLUMA-T mission
Summary
Summary
The Integrated LCRD LEO User Modem and Amplifier Terminal (ILLUMA-T) payload was the first space-based user terminal to demonstrate successful two-way optical communications with a ground terminal via NASA's Laser Communications Relay Demonstration (LCRD). In order to acquire the link, the ILLUMA-T optical module open loop points a wide beacon...