Optically Switched Submillimeter-Wave Oscillator
Abstract
There exists a critical need for efficient local oscillators for heterodyne mixers operating in the 300 to 3000 GHz region. Applications include space-based submillimeter wave imaging arrays, airborne atmosphere spectroscopy, all-weather imaging radar, non-destructive testing, plasma diagnostics, weapon and contraband detection and communications. In order to address these problems, we propose a novel low power semiconductor device which uses time delays from a common optical pulse train to achieve a much higher frequency electrical pulse train, which contains a strong component and appreciable power of the desired submillimeter-wave harmonic for the output and which can be readily coupled electrically or radiatively to a receiver. In our effort, we developed a concept of linear array of ten optical switches. The microwave output from the switches can be in the 100 - 200 GHz frequency range. In order to implement this concept, a single photo-conductive switch of polycrystalline InGaAs was fabricated and tested. Optically switched submillimeter.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 08, 1994
- Accession Number
- ADA278014
Entities
People
- Michael G. Spencer
- Xiao Tang
Organizations
- Howard University