Quaternary pulse position modulation electronics for free-space laser communicationsThe 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.
Document ID
19910069079
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Budinger, J. M. (NASA Lewis Research Center Cleveland, OH, United States)
Kerslake, S. D. (NASA Lewis Research Center Cleveland, OH, United States)
Nagy, L. A. (NASA Lewis Research Center Cleveland, OH, United States)
Shalkhauser, M. J. (NASA Lewis Research Center Cleveland, OH, United States)
Soni, N. J. (NASA Lewis Research Center Cleveland, OH, United States)
Cauley, M. A. (NASA Lewis Research Center Cleveland, OH, United States)
Mohamed, J. H. (NASA Lewis Research Center Cleveland, OH, United States)
Stover, J. B. (NASA Lewis Research Center Cleveland, OH, United States)
Romanofsky, R. R. (NASA Lewis Research Center Cleveland, OH, United States)
Lizanich, P. J. (Analex Corp. Brook Park, OH, United States)