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Proceedings Paper

Optical multi-coset sampling of GHz-band chirped signals
Author(s): George C. Valley; George A. Sefler; T. Justin Shaw; Stephen L. Smith
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Paper Abstract

Direct digitization of long, wideband chirped RF signals in the GHz band requires power hungry ADCs and produces large data sets. Here we present an optical scheme to perform multi-coset sampling of such signals with reduced power consumption and smaller data sets. In our scheme a repetitively pulsed femtosecond laser is dispersed to the interpulse time, the RF is modulated on the optical field, and the field is directed to a pair of wavelength-division demultiplexers (WDM). The channels of the WDM are attenuated with a pseudo-random sequence to form a coset pattern that repeats at the laser repetition rate. After a photodiode, the photocurrent is integrated for the duration of the dispersed optical pulse so that the coset pattern non-uniformly samples the RF signal. Since the laser repetition rate is uncorrelated with the RF, each coset provides an independent measurement of the RF. Experimental and numerical results show that 4 properties of the RF chirp pulse can be determined from the multiple coset samples: carrier frequency, chirp rate, start time, and pulse duration. Results are presented for a 20MHz chirp on a 13 microsecond pulse at a carrier of 2.473 GHz.

Paper Details

Date Published: 14 March 2015
PDF: 7 pages
Proc. SPIE 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII, 93620M (14 March 2015); doi: 10.1117/12.2076285
Show Author Affiliations
George C. Valley, The Aerospace Corp. (United States)
George A. Sefler, The Aerospace Corp. (United States)
T. Justin Shaw, The Aerospace Corp. (United States)
Stephen L. Smith, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 9362:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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