Two-dimensional optical beam-forming networks

Daniel Dolfi; Pascal Joffre; J. Antoine; Jean-Pierre Huignard; J. Roger; Ph. Granger

doi:10.1117/12.177402

10 June 1994 Two-dimensional optical beam-forming networks

Daniel Dolfi, Pascal Joffre, J. Antoine, Jean-Pierre Huignard, J. Roger, Ph. Granger

Proceedings Volume 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV; (1994) https://doi.org/10.1117/12.177402
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

This paper presents recent advances toward the experimental demonstration and the far field pattern characterization of an optically controlled phased array antenna operating at 3 GHz. The 2D optical architecture is based on polarization switching by N (N equals 6) spatial light modulators of pxp pixels (p equals 4). It provides 2^N-1 time delays values and an analog control of the 0 to 2(pi) phase for each of the pxp microwave signals actuating an active antenna. These signals originate from the coherent detection of a dual frequency laser beam obtained with an acousto-optic frequency shifter. Furthermore, we also present the principle of a new photodetector based on the synchronous drift of photogenerated carriers with a moving interference pattern. This moving pattern results from the interference of the two components of the dual frequency optical carrier of the microwave signal used in the above architecture. It provides a large detection volume which could yield a high saturation intensity. A theoretical analysis is detailed and followed by an experimental demonstration in GaAs at a frequency f equals 210 MHz.

Citation Download Citation

Daniel Dolfi, Pascal Joffre, J. Antoine, Jean-Pierre Huignard, J. Roger, and Ph. Granger "Two-dimensional optical beam-forming networks", Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994); https://doi.org/10.1117/12.177402

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