Accession Number : AD0457827


Title :   THE GAIN ELEMENT IN OPTOELECTRONIC LOGIC BUILDING BLOCKS.


Descriptive Note : Technical rept.,


Corporate Author : STANFORD UNIV CA STANFORD ELECTRONICS LABS


Personal Author(s) : Ruegg, H


Report Date : Nov 1964


Pagination or Media Count : 25


Abstract : To obtain design criteria for optoelectronic logic building blocks, ways of indirectly amplifying light were compared with respect to signal-propagation delay and power consumption. A system consisting of a junction detector, injection luminescent diodes, and an electronic amplifier was used as a model. Consistent with the gain-bandwidth limitations of the electronic amplifiers, the propagation delay was proportional to the power gain required from the electronic amplifier. This power gain was equal to the product of the fan-out and the power efficiency of optoelectronic block. For most arrangements, the propagation delay increased with decreasing photon flux density in the system. The photodiode acts as a fast detector as long as the photon flux density is high. The photodiode leads to a rather slow optoelectronic element if used in a system with a low efficiency. By virtue of its current gain, the phototransistor is capable of directly providing a quantum gain. When it is used as the detectingamplifying device, propagation delays approaching the ones achievable with a photodiode can be obtained with less hardware and at a lower power. (Author)


Descriptors :   *DIGITAL SYSTEMS , NAVAL RESEARCH , SEMICONDUCTOR DIODES , PHOTOELECTRIC CELLS(SEMICONDUCTOR) , GAIN , BANDWIDTH , PHOTONS , TRANSISTORS , COMPUTER LOGIC , MATHEMATICAL MODELS


Distribution Statement : APPROVED FOR PUBLIC RELEASE