We built and experimentally tested an in-line interferometric time integrating correlator. This design demonstrates performance improvements compared to other time integrating correlators, because the +1 diffracted orders, which carry the information to be correlated, travel over a common path and because the undiffracted light from the first acousto-optic (AO) cell is used as the input to the second AO cell. The architecture also provides control of the conelation spatial frequency to match the detector elements spatial frequency. The simplicity of the design, improved light efficiency, and increased optical stability make it an attractive alternative for applications in radar signal processing and spectrum analysis.
We present the history and progress of the Anti-Jamming Optical Beam-forming (AJOB) program at Rome Laboratory's Photonics Center. The main objective ofthis program is near-real-time active noise cancellation applied to radar signal processing. All efforts mentioned here were Rome Lab in-house efforts, conducted at the Photonics Center, unless otherwise noted. The United States Air Force funded all work described here.
We present an overview of continuing research on a dynamic optical system for producing variable delays of radio frequency (RF) signals. Our approach utilizes both a 16 & 64 tap programmable delay line. The approach uses a micro-laser diode array to tap an acousto-optic (AO) cell at various spatial positions along the acoustic channel. This generates multiple delayed versions of the input signal to the AO cell. The use of the laser diode array allows for a programmable time delay, programmable weighting of each delay, a large number of delays equal to the number of elements in the diode array, and multiple delays at one time. This architecture, upon completion of future compatibility testing will replace an existing multi AO cell tap delay line as part of an adaptive optical processor for side lobe jamming cancellation.
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