USE OF MODULATED, NONCOHERENT, OPTICAL FREQUENCY CARRIERS IN ELECTRONIC COMPUTER ELEMENTS,
Abstract
Light-coupled switching devices are surveyed with the aim of investigating their usefulness in optic digital computers and other complex logic machines. Light-emitting diodes such as GaAs diodes utilizing the injection mechanism may be used as light modulators up to frequencies of the order of 1-4 GHZ. Their properties and capabilities are cited. Photodiodes with p-n and p-i-n structures are mentioned as effective demodulators or optic receivers. Their frequency operating ranges, output signal amplitudes, and temperature ranges are compared. Advantages cited for these devices are their low cost, small size, and handling convenience. Disadvantages listed include low light-generating efficiency, high receiver inertia, and losses (about 1.1 db/m), when fiber optic conductors are used as the transmission medium. Various applications of these optic devices are illustrated, e.g., a CRT beam modulation circuit, quartz generator output circuit, and phase detector, light relay (using a p-n-p-n switch as a receiver). The authors also present examples of logic circuits (and, NOT, and OR) bases on these devices. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1968
- Accession Number
- AD0682463
Entities
People
- A. N. Mansurov
- E. A. Georgievskaya
- V. S. Etkin
Organizations
- National Air and Space Intelligence Center