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Proceedings Paper

A multi-rate DPSK modem for free-space laser communications
Author(s): N. W. Spellmeyer; C. A. Browne; D. O. Caplan; J. J. Carney; M. L. Chavez; A. S. Fletcher; J. J. Fitzgerald; R. D. Kaminsky; G. Lund; S. A. Hamilton; R. J. Magliocco; O. V. Mikulina; R. J. Murphy; H. G. Rao; M. S. Scheinbart; M. M. Seaver; J. P. Wang
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Paper Abstract

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.

Paper Details

Date Published: 25 March 2014
PDF: 9 pages
Proc. SPIE 8971, Free-Space Laser Communication and Atmospheric Propagation XXVI, 89710J (25 March 2014); doi: 10.1117/12.2057568
Show Author Affiliations
N. W. Spellmeyer, MIT Lincoln Lab. (United States)
C. A. Browne, MIT Lincoln Lab. (United States)
D. O. Caplan, MIT Lincoln Lab. (United States)
J. J. Carney, MIT Lincoln Lab. (United States)
M. L. Chavez, MIT Lincoln Lab. (United States)
A. S. Fletcher, MIT Lincoln Lab. (United States)
J. J. Fitzgerald, MIT Lincoln Lab. (United States)
R. D. Kaminsky, MIT Lincoln Lab. (United States)
G. Lund, MIT Lincoln Lab. (United States)
S. A. Hamilton, MIT Lincoln Lab. (United States)
R. J. Magliocco, MIT Lincoln Lab. (United States)
O. V. Mikulina, MIT Lincoln Lab. (United States)
R. J. Murphy, MIT Lincoln Lab. (United States)
H. G. Rao, MIT Lincoln Lab. (United States)
M. S. Scheinbart, MIT Lincoln Lab. (United States)
M. M. Seaver, MIT Lincoln Lab. (United States)
J. P. Wang, MIT Lincoln Lab. (United States)


Published in SPIE Proceedings Vol. 8971:
Free-Space Laser Communication and Atmospheric Propagation XXVI
Hamid Hemmati; Don M. Boroson, Editor(s)

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