This paper provides an overview of NASA's latest efforts in developing and deploying optical
communications. It focuses on NASA's flagship Near Earth effort, the Laser Communications …

Small satellites, particularly CubeSats, have become popular platforms for a wide variety of
scientific, commercial and military remote sensing applications. Inexpensive commercial o …

We present the principle, implementation, and performance of a recently introduced high-
sensitivity modulation format based on the combined use of polarization-division …

This paper provides an overview of NASA's Laser Communications Relay Demonstration
Project (LCRD). LCRD will fly two optical communications terminals on a Loral commercial …

We describe a flexible high-sensitivity laser communication transceiver design that can
significantly benefit performance and cost of NASA's satellite-based Laser Communications …

The multi-rate DPSK format, which enables efficient free-space laser communications over a
wide range of data rates, is finding applications in NASA's Laser Communications Relay …

We propose a power-efficient modulation/detection scheme that combines PDM-QPSK and
16-ary-pulse-position-modulation. A record sensitivity of 3.5 photons per bit at BER= 10− 3 is …

Deep-space free-space optical (FSO) communication utilized the light wave as carriers for
information transfer which has the major benefit of small size, lightweight, and low …

This paper provides an update on NASA's Laser Communications Relay Demonstration
Project (LCRD), a joint project between NASA's Goddard Space Flight Center (GSFC), the …

We describe a simple 4-PPM demodulator that uses analog delay lines and simple 1-bit
comparators to determine the least-significant bit and most-significant bit of the 4-PPM …