Accession Number:

AD0672824

Title:

OPTO-ELECTRONICS SWITCHING MATRIX,

Descriptive Note:

Corporate Author:

ILLINOIS UNIV URBANA DEPT OF COMPUTER SCIENCE

Personal Author(s):

Report Date:

1968-05-28

Pagination or Media Count:

120.0

Abstract:

A cross-bar type switching matrix system with photoconductive cells as basic switching elements and an optical signal as the switching driving source has been studied and developed. The switching unit at each crosspoint in the matrix contains three photoconductive cells in T-connection, in which the center branch is grounded and the two arm branches are connected to input and output channels respectively. Switching action is accomplished by scanning the matrix panel with a programmed light beam. The state of a switching unit depends upon whether the center branch or the arm branches are being excited by the light beam. The equivalent circuit of a photoconductive cell under the specific application has been developed. The complete equivalent circuit contains harmonic terms which are the consequence of optical beam scanning. These harmonic terms are responsible for the noise appearing at the output. The performance of the system is analyzed with the equivalent circuit. Its characteristics is described by defining transmission efficiency, cross-talk factor and injection noise factor. A prototype system with a capacity of four input channels and four output channels has been constructed to demonstrate the feasibility of the idea. Experimental results were very satisfactory. Author

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE