The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 2006
Filed:
Apr. 19, 2002
Paul H. Dietz, Hopkinton, MA (US);
William S. Yerazunis, Acton, MA (US);
Darren L. Leigh, Belmont, MA (US);
Giovanni Vannucci, Red Bank, NJ (US);
Paul H. Dietz, Hopkinton, MA (US);
William S. Yerazunis, Acton, MA (US);
Darren L. Leigh, Belmont, MA (US);
Giovanni Vannucci, Red Bank, NJ (US);
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
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.