Browse Prior Art Database

Optical Data Coupler

IP.com Disclosure Number: IPCOM000081099D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Clapper, RC: AUTHOR [+4]

Abstract

Optical data coupler (ODC) system 10 provides electrical isolation between two adjacent areas A, B. Area A has computer processing equipment handling both classified and unclassified data. ODC system 10 allows the transmission of unclassified data from secure area A to another, e.g., nonsecure, area B via light. It provides complete electrical isolation and eliminates any detectable signal radiation of classified information.

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Optical Data Coupler

Optical data coupler (ODC) system 10 provides electrical isolation between two adjacent areas A, B. Area A has computer processing equipment handling both classified and unclassified data. ODC system 10 allows the transmission of unclassified data from secure area A to another, e.g., nonsecure, area B via light. It provides complete electrical isolation and eliminates any detectable signal radiation of classified information.

ODC system 10 consists of a wall mounted unit 11 and two individual floor mounted power supply units, not shown, one for each side of the radio-frequency interference (RFI) secure enclosure wall 12. This is done to achieve total electrical isolation between input and output.

Unit 11 contains a plurality of electrical-optical data channels, only one of which is shown schematically in the figure. The channels may be, if desired, bidirectional.

In operation, the electrical signal is received by the channel through an impedance matching circuit 13, which meets the electrical requirements of the system application in which it is being installed as well as the drive requirements of the system 10. The signal is then threshold detected at a predetermined reference voltage by the threshold detector of circuit 14, to remove any spurious signal or noise present on the low or 0 level of the signal waveform. The signal is then passed through a limiter of circuit 14 which removes any spurious signals or noise from the high or 1 level...