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http://hdl.handle.net/1903/2722
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| Title: | DELAY INDUCED INSTABILITIES IN COUPLED SEMICONDUCTOR LASERS AND MACKEY-GLASS ELECTRONIC CIRCUITS |
| Authors: | Kim, Min-Young |
| Advisors: | Roy, Rajarshi |
| Department/Program: | Physics |
| Type: | Dissertation |
| Sponsors: | Digital Repository at the University of Maryland
University of Maryland (College Park, Md.) |
| Keywords: | Physics, Optics (0752) |
| Issue Date: | 25-Jul-2005 |
| Abstract: | We describe two experimental systems where a time-delayed feedback mechanism plays an important role in inducing instabilities. The first system
consists of two cross-coupled semiconductor lasers with time-delayed negative optoelectronic feedback. This system is described by coupled
delay-differential equations, and we explore the dynamics near the onset of oscillations as the coupling strength is varied. We study the influence
of asymmetric coupling strengths on the onset of oscillations and the dependence of the amplitudes of oscillations on the coupling strengths.
In-phase oscillations with a period of twice the delay time emerge as the product of coupling strengths increases above a critical value. A scaling
relationship is observed between rescaled amplitudes of oscillations and the product of the coupling strengths. We also study the dependence of the
periodicity and the phase relations of the oscillations as we adjust the delay time.
The second system is an electronic circuit w... |
| URI: | http://hdl.handle.net/1903/2722 |
| Appears in Collections: | Physics Theses and Dissertations
UM Theses and Dissertations
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| umi-umd-2668.pdf | | 9033Kb | Adobe PDF | 151 | View/Open |
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