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Proceedings Paper

Sampling technique for achieving full unit-circle coverage using a real-axis spatial light modulator
Author(s): Steven A. Serati; Kipp Andon Bauchert
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Paper Abstract

We investigate the possibility of using a real-axis spatial light modulator (SLM) to realize complex-amplitude modulation with full coverage over the unit circle. The real-axis SLM produces a pixelated bipolar-amplitude wavefront. Each pixel is basically a spatial pulse width with the signal information being carried by the pulse's amplitude. Data streams generated in this manner have real and imaginary components due to the relative even and odd symmetry of the pulse amplitude modulation. When the pulse rate is twice the minimum Nyquist rate for band-limited amplitude modulation, it is possible to resolve the signal into its quadrature phase components (real and imaginary terms). By changing the relative amplitude of these quadrature phase terms, any value within the complex plane is accessible. Since the SLM does not have any optical gain, coverage is limited to the unit circle in the complex plane.

Paper Details

Date Published: 9 March 1999
PDF: 8 pages
Proc. SPIE 3715, Optical Pattern Recognition X, (9 March 1999); doi: 10.1117/12.341291
Show Author Affiliations
Steven A. Serati, Boulder Nonlinear Systems, Inc. (United States)
Kipp Andon Bauchert, Boulder Nonlinear Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 3715:
Optical Pattern Recognition X
David P. Casasent; Tien-Hsin Chao, Editor(s)

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