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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:41 |
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Conference: Bucharest University Faculty of Physics 2001 Meeting
Section: Optics and Spectroscopy
Title:
NUMERICAL ANALYSIS OF THE CHAOTIC BEHAVIOR OF SEMICONDUCTOR LASERS SYSTEMS
Authors:
M.Bulinski, M. L. Pascu*, A. Mardare
Affiliation:
Faculty of Physics, University of Bucharest, P.O.Box MG 11, 76900, Bucharest-Magurele, Romania
* The National Institute for Lasers, Plasma and Radiation Physics, Lasers Department, P.O. Box MG 36, 76900, Bucharest, Romania
E-mail
Keywords:
Abstract:
The behavior of a single mod semiconductor laser diode has been modeled and numerically studied, solving the rate equations for complex slowly varying amplitude of the electric field and carrier inside the laser cavity.
An external cavity, weakly coupled, imposes chaotic behavior to the LD system. The chaotic behavior was analyzed for values of the injection current slightly above threshold current and also for values bigger than threshold current. The chaotic behaviors for these values were compared and analyzed. It was studied the routes to chaos in this laser system. The chaotic behavior depends on the external coupling factor of the external cavity.
The influence of a modulated injection current has been analyzed.
We also discuss the possibility of transmitting an encoded digital message by using the synchronization of two chaotic semiconductor lasers, in a master-slave configuration. To synchronize the lasers, a small amount of output power from the master laser is injected, after propagating through an optical fiber, into the slave laser. The output of the master laser can be used as a chaotic carrier to encode a digital message, which can be recovered after propagating long distances. It was checked the robustness of one synchronization scheme when the two lasers are slightly different.
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