Laser beam data verification system
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United States of America Patent
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-
Nov 21, 1989
Grant Date -
N/A
app pub date -
Aug 25, 1988
filing date -
Aug 25, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A beam failure alarm and protection circuit for a laser communications link. In order to distinguish a true beam failure from a mere absence of data to be transmitted, an alternate signal is produced in the transmitter whenever no data is available for transmission. The alternate signal is of a much higher frequency than true signals and is bandpass filtered. Its absence is used at the receiver to shut down the data output and trigger an alarm if the receiver senses no alternate signal within the maximum time that a typical burst of data would terminate.
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