NASA NTRS · 19910069079
Quaternary pulse position modulation electronics for free-space laser communications
Abstract
The development of a high data-rate communications electronic subsystem for future application in free-space, direct-detection laser communications is described. The dual channel subsystem uses quaternary pulse position modulation (GPPM) and operates at a throughput of 650 megabits per second. Transmitting functions described include source data multiplexing, channel data multiplexing, and QPPM symbol encoding. Implementation of a prototype version in discrete gallium arsenide logic, radiofrequency components, and microstrip circuitry is presented.
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Budinger, J. M., Kerslake, S. D., Nagy, L. A., Shalkhauser, M. J., Soni, N. J., Cauley, M. A., Mohamed, J. H., Stover, J. B., Romanofsky, R. R., Lizanich, P. J.. 1991-09-01. Quaternary pulse position modulation electronics for free-space laser communications. https://ntrs.nasa.gov/citations/19910069079
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