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Optical receivers for digital communication with very weak signals Julius Goldhar Department of Electrical and Computer Engineering University of Maryland
Seminar Room, Lower Level, LPS 8050 Greenmead Dr., College Park, MD 20740
Abstract: In theory, it has been known for decades that it is possible to perform optical measurements such that the error rate approaches the Helstrom bound, which can be significantly below the shot noise limit. The theoretical implementation of a "measurement" means finding an appropriate set of mathematical operators, but this is not very helpful to an experimentalist. There have been some proposed schemes to experimentally beat the shot noise limit for specific modulation schemes, such as the Dolinar receiver for binary modulation; most of the concepts proposed in the past were quite impractical. This talk will review the theory and discuss some practical techniques for implementing optimal optical receivers for communications at high bit rates and low photon numbers.
Bio: Julius Goldhar received his Ph.D. in 1975 from M.I.T. working with Prof. Ali Javan on high power gas lasers. After that he was a staff physicist at the Lawrence Livermore National Laboratory where he was developing new types of laser drivers for inertial confinement fusion. Since 1985 he has been with the Electrical and Computer Engineering Department at UMCP. His research interests include laser technology, laser matter interactions and applications of nonlinear optics for optical signal processing for communications. He is a Fellow of Optical Society of America.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Note: For guests attending the LPS seminar, please use the phone on the left hand side of the front door to call the receptionist for entry.
The LPS Seminar Chairmen: Dr. Chris Richardson (301-935-6426) Prof. Gary Carter (301-935-6455)
This Event is For: Graduate • Faculty • Post-Docs
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