Optical Excision Program, Optical Clippers
Abstract
The ability to significantly reduce the vulnerability of broadband receivers to narrowband jammer interference has been successfully demonstrated in the laboratory. The interference signal levels were attenuated by the self- adaptive frequency selective limiting properties of an optical processor invented by PROBE SYSTEMS, INC. This report describes the evaluation of optical clipper materials that, when placed in the optically-generated spectrum of a broadband RF signal, would selectively attenuate narrowband signals. The three optical clippers that were evaluated were: (1) a PROM developed by Itek Corporation and supplied by Naval Research Laboratory, (2) a selection of photodichroic crystals developed and supplied by Naval Research Laboratory, and (3) a photochromic glass purchased from Corning. The most successful results were obtained with an optical memory developed by Itek and named the PROM. This device, when exposed to narrowband signals, affects the polarization of the transmitted light and at the same time passes those portions of broadband signals not covered by narrowband signals. By coherently detecting the transmitted light, the optical processor continuously reconstructs the broadband signals without the interference that could have degraded or even prevented further signal processing or display.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 15, 1980
- Accession Number
- ADA086914
Entities
People
- Dave Jackson