A multi-rate DPSK modem for free-space laser communications
2014
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 Demonstration. We discuss the design and testing of an
efficient and robust multi-rate DPSK modem, including aspects of the electrical, mechanical, thermal, and optical
design. The modem includes an optically preamplified receiver, an 0.5-W average power transmitter, a LEON3 rad-hard
microcontroller that provides the command and telemetry interface and supervisory control, and a Xilinx Virtex-5 radhard
reprogrammable FPGA that both supports the high-speed data flow to and from the modem and controls the
modem’s analog and digital subsystems. For additional flexibility, the transmitter and receiver can be configured to
support operation with multi-rate PPM waveforms.
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