Visit http://www.jacobsschool.ucsd.edu/news/news_events/ for a complete listing of events. http://www.jacobsschool.ucsd.edu/ en-us Copyright 2013, Regents of the University of California. news@soe.ucsd.edu (Editor) soeweb@soe.ucsd.edu (Webmaster) Wed, 22 May 2013 10:31:36 PDT Wed, 22 May 2013 10:31:36 PDT Wed, 15 May 2013 12:23:35 PDT http://www.jacobsschool.ucsd.edu/news/news_events/event.sfe?id=2177 Efficient Design of Tunable Photonic Oscillators chennessy@ucsd.edu (Claudia Hennessy) http://www.jacobsschool.ucsd.edu/news/news_events/event.sfe?id=2177 UC San Diego Jacobs School Featured Events Featured Electrical and Computer Engineering Efficient Design of Tunable Photonic Oscillators 2177 Fri, 14 Jun 2013 Fri, 14 Jun 2013 Fri, 14 Jun 2013 11:00am - 12:00noon Jacobs Hall, Room 2512 (Booker Conf Room) Profs. Y.Fainman & N. Peyghambarian Efficient Design of Tunable Photonic Oscillators <p> Limit Cycle oscillators are used to model a broad range of periodic nonlinear phenomena. Using the Optically Injected Semiconductor Oscillator as a <strong>paradigm</strong>, we will demonstrate that at specific islands in the detuning and injection level map, the period-one oscillation frequency is simultaneously insensitive to multiple perturbation sources. In our system, these include the temperature fluctuations experienced by the master and slave lasers, as well as fluctuations in the bias current applied to the slave laser. Tuning of the oscillation frequency then depends only on the injected optical field amplitude. Experimental measurements are in good quantitative agreement with numerical modeling and analysis based on reduced generalized <strong>Adler</strong> type equations. These special operating regions should prove valuable for developing ultra-stable nonlinear oscillators such as sharp linewidth, frequency tunable, photonic microwave oscillators. Finally the concept of an <strong>Isochron</strong> originally developed in Mathematical Biology will be reviewed and placed on context for efficient design of stable frequency sources via systems of coupled limit cycles oscillators.</p> Dr. Vassilios Kovanis Technical Staff Member/AFRL <p> &nbsp;</p> <p> <strong>Vassilios Kovanis&nbsp;</strong>is member of the technical staff at AFRL, and is associated with the Electro Science Lab (ESL) at The Ohio State University. In the past, Dr. Kovanis served as the Technical Advisor of the Photonics Technologies Branch at the Sensors Directorate of the Air Force Research Laboratory. His responsibilities include managing an Air Force Office of Scientific Research for optical diverse waveform generation and low noise oscillators. He serves as a DARPA agent for the Microsystems Technology and Strategic Technology Offices in the areas of microwave photonics and transformational antenna programs. He was the Lead Program Manager on the Optical Metamaterials SENSORS Directorate enterprise.</p> <p> He studied physics at the University of Athens, Greece, followed by graduate work at Temple University in Philadelphia, Pennsylvania. He wrote his PhD dissertation at the University of New Mexico, Albuquerque, NM, in condensed matter theory. In September 1989, he joined the Nonlinear Optics Center at Air Force Weapons Laboratory at Kirtland Air Force Base. He remained with that organization for the next eleven years, working on multiple projects of optical and electronic technologies. During that period, he held research faculty positions with the Applied Mathematics and the Electrical Engineering Departments at the University of New Mexico, and was a National Research Council Fellow between 1992 and 1994. Subsequently, Dr. Kovanis did a stint as a Senior Research Scientist in corporate Research and Development Laboratories with Corning, Inc. in Corning, NY, and as a Program Manager at BinOptics Corporation in Ithaca, NY, for next generation photonics product development. Between 2003 and 2005, he was member of the faculty at the Applied Mathematics Department of Rochester Institute of Technology. His research interests are on designing low-noise tunable photonic oscillators, photonics synthetic matter, and applications of compressive sensing to photonic receivers.</p> 858-534-3294 chennessy@ucsd.edu Hennessy Claudia