US 7,321,732 B2
Method and apparatus for improving noise immunity for low intensity optical communication
Jurgis Astrauskas, Saint Charles, Ill. (US)
Assigned to Emerson Electric Co., St. Louis, Mo. (US)
Filed on Jul. 28, 2003, as Appl. No. 10/628,765.
Prior Publication US 2005/0025494 A1, Feb. 03, 2005
Int. Cl. H04B 10/00 (2006.01)
U.S. Cl. 398—138  [398/130; 398/164] 9 Claims
OG exemplary drawing
 
1. A probe for bi-directional optical communication with a device external to the probe, the probe comprising:
a housing;
an optical transmitter mounted within the housing that generates a light signal having a logical polarity that is the opposite of the logical polarity of the light signal generated by an indicator light associated with an external device with which the communication probe is communicating; and
an optical receiver mounted within the housing for receiving the light signal generated by the indicator light and generating an electrical data signal from the received light signal.