Optical transmitter-receiver
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 20, 2004
Grant Date -
Oct 25, 2001
app pub date -
Jan 29, 2001
filing date -
Feb 3, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical transmitter-receiver that does not have a harmful effect on the human eye when an optical fiber is disconnected from the apparatus and is able to determine easily when the fiber has been reconnected. A normal signal detector and a dummy signal detector determine when a signal from another optical transmitter-receiver is no longer received due to disconnection of an optical fiber. This result switches an output switch and causes a second reference voltage to be transmitted to an optical output automatic controller, thereby reducing the power of a laser diode. At the same time, a signal switch provides a dummy signal having a low frequency to the laser diode in place of the normal signal, resulting in output of a dummy optical signal. At this time, the other optical transmitter-receiver also outputs a dummy optical signal. When the optical fiber is reconnected, the dummy signal transmitted from the other optical transmitter-receiver is detected. Upon detection, the output of the laser diode is set to a normal high value, and a normal signal is output.
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