Fly-By-Light

We propose the novel use of a lithium niobate, integrated optic modulator for amplification and processing of electrical signals from sensors or control signals for propulstion systems. Such a processor is a black bos whose input and output are electrical signals. The insider, however, consists of a lithium niobate integrated optic chip incorporating modulators, switches, A/D converters, phase retarders, etc., instead of conventional electronic components. The "power" to drive the processor is delivered optically through fibers so that EMI problems are completely eliminated. In Phase I we will demonstrate one version of such a processor which will simply amplify electrical signals with a potential RF to RF gain of 20 dB and a dynamic range of 80 dB. We will develop techniques of passive biasing of modulators so that the amplifier will operate in the linear range. Optical wavelenghts and substrate materials will be chose for suitability for this novel application. We will also determine compatible processing functions that can be implemented in the integrated optic format and methods of implementing them in Phase II. Anticipated Benefits: This generic processor will open a new class of optical instrumentation that will reap the full benefits of protection from EMI. They will find use in aircraft fly-by-light systems, optical domain A/D conversion, signal multiplexing and control signal transportation. Commercial applications include thunderstorm detection systems and instrument landing systems (ILS) deployed at airports and plagued by EMI.