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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 22 — Nov. 15, 2012
  • pp: 4675–4677

Compressive sensing of sparse radio frequency signals using optical mixing

George C. Valley, George A. Sefler, and T. Justin Shaw  »View Author Affiliations


Optics Letters, Vol. 37, Issue 22, pp. 4675-4677 (2012)
http://dx.doi.org/10.1364/OL.37.004675


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Abstract

We demonstrate an optical mixing system for measuring properties of sparse radio frequency (RF) signals using compressive sensing (CS). Two types of sparse RF signals are investigated: (1) a signal that consists of a few 0.4 ns pulses in a 26.8 ns window and (2) a signal that consists of a few sinusoids at different frequencies. The RF is modulated onto the intensity of a repetitively pulsed, wavelength-chirped optical field, and time-wavelength-space mapping is used to map the optical field onto a 118-pixel, one-dimensional spatial light modulator (SLM). The SLM pixels are programmed with a pseudo-random bit sequence (PRBS) to form one row of the CS measurement matrix, and the optical throughput is integrated with a photodiode to obtain one value of the CS measurement vector. Then the PRBS is changed to form the second row of the mixing matrix and a second value of the measurement vector is obtained. This process is performed 118 times so that we can vary the dimensions of the CS measurement matrix from 1×118 to 118×118 (square). We use the penalized 1 norm method with stopping parameter λ (also called basis pursuit denoising) to recover pulsed or sinusoidal RF signals as a function of the small dimension of the measurement matrix and stopping parameter. For a square matrix, we also find that penalized 1 norm recovery performs better than conventional recovery using matrix inversion.

© 2012 Optical Society of America

OCIS Codes
(070.4560) Fourier optics and signal processing : Data processing by optical means
(320.7085) Ultrafast optics : Ultrafast information processing

ToC Category:
Fourier Optics and Signal Processing

History
Original Manuscript: August 6, 2012
Manuscript Accepted: September 26, 2012
Published: November 8, 2012

Citation
George C. Valley, George A. Sefler, and T. Justin Shaw, "Compressive sensing of sparse radio frequency signals using optical mixing," Opt. Lett. 37, 4675-4677 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-22-4675

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