Circuit for detecting the shutoff of an optical output
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United States of America Patent
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Oct 8, 2002
Grant Date -
N/A
app pub date -
Nov 30, 1999
filing date -
Nov 30, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical output shutoff detecting circuit of the present invention includes a flip-flop. The flip-flop has a D terminal to which a signal representative of a result of comparison between the output level of an optical signal output from a laser diode and a reference signal is input, and a C terminal to which a signal produced by delaying a data signal is input. The output signal of the flip-flop is used to detect the output level of the optical signal.
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