Optical multi-coset sampling of GHz-band chirped signals

George C. Valley; George A. Sefler; T. Justin Shaw; Stephen L. Smith

doi:10.1117/12.2076285

14 March 2015 Optical multi-coset sampling of GHz-band chirped signals

George C. Valley, George A. Sefler, T. Justin Shaw, Stephen L. Smith

Proceedings Volume 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII; 93620M (2015) https://doi.org/10.1117/12.2076285
Event: SPIE OPTO, 2015, San Francisco, California, United States

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.

Citation Download Citation

George C. Valley, George A. Sefler, T. Justin Shaw, and Stephen L. Smith "Optical multi-coset sampling of GHz-band chirped signals", Proc. SPIE 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII, 93620M (14 March 2015); https://doi.org/10.1117/12.2076285

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