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Background-free balanced optical cross correlator

United States Patent

8,916,813
December 23, 2014
View the Complete Patent at the US Patent & Trademark Office
A balanced optical cross correlator includes an optical waveguide, a first photodiode including a first n-type semiconductor and a first p-type semiconductor positioned about the optical waveguide on a first side of the optical waveguide's point of symmetry, and a second photodiode including a second n-type semiconductor and a second p-type semiconductor positioned about the optical waveguide on a second side of the optical waveguide's point of symmetry. A balanced receiver including first and second inputs is configured to produce an output current or voltage that reflects a difference in currents or voltages, originating from the first and the second photodiodes of the balanced cross correlator and fed to the first input and to the second input of the balanced receiver.
Nejadmalayeri; Amir Hossein (Toronto, CA), Kaertner; Franz X. (Hamburg, DE)
Massachusetts Institute of Technology (Cambridge, MA)
13/ 613,257
20130206969
September 13, 2012
GOVERNMENT SUPPORT This invention was made with government support under Grant No. DE-SC0005262 awarded by the Department of Energy. The government has certain rights in the invention.