Optical communications – Optical transceiver – Single device as transmitter and receiver
Reexamination Certificate
2006-07-04
2006-07-04
Chan, Jason (Department: 2633)
Optical communications
Optical transceiver
Single device as transmitter and receiver
C398S135000
Reexamination Certificate
active
07072587
ABSTRACT:
An optical communications transceiver includes an LED coupled in series with a resistor. A microprocessor has one I/O pin connected to the LED. In a first mode or transmit mode, the LED is periodically driving in forward bias to emit light to transmit data. In a second or receive mode, the LED is periodically not driven in reverse bias, e.g., reverse bias or zero bias. Then, the LED is allowed to change charge of the capacitance of the LED's junction using a photo-current. The change in charge is measured using a timer. When the change in charge exceeds a predetermined threshold, input light is sensed. Thus, the LED can be used to receive data in the second mode.
REFERENCES:
patent: 5268635 (1993-12-01), Bortolini et al.
patent: 5631757 (1997-05-01), Bodeep et al.
patent: 6559788 (2003-05-01), Murphy
patent: 6701091 (2004-03-01), Escobosa et al.
Dietz Paul H.
Leigh Darren L.
Vannucci Giovanni
Yerazunis William S.
Brinkman Dirk
Chan Jason
Curs Nathan
Curtin Andrew J.
Mitsubishi Electric Research Laboratories Inc.
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