Abstract

We present experimental results of an RF photonic processor, using a 45° cut BaTiO₃ crystal to implement an adaptive weight matrix, capable of performing broadband, adaptive beam forming and jammer nulling for phased-array antennas. The optical architecture is based upon the BEAMTAP (Broadband Efficient Adaptive Method for True-time-delay Array Processing) algorithm, which enables an efficient implementation using photorefractive dynamic holograms as adaptive weights, a traveling-fringes detector for coherent detection, and an acousto-optic deflector for real-time weight adaptation. Experimental null depths in excess of 40 dB for narrowband jammers, and 25−35 dB for broadband jammers, are presented.

© 2003 Optical Society of America