Investigation of Optical Bistability in Quantum Dot and Erbium Doped Fiber Ring Resonator

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Saleki, Ziba | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40352 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Bahrampour, Alireza
Abstract:
Optical bistability is one of the most important results of nonlinear optics. The term optical bistability refers to the situation in which two different output intensities are possible for a given input intensity. Interest in optical bistability stems from its potential usefulness as a switch for use in optical communication and in optical computing. Optical bistability is resulted by nonlinear phenomena such as kerr effect, two photon absorption and saturable absorber. In this thesis, we study the optical bistability in a double-coupler ring resonator, in which the right half of ring is made of an erbium doped fiber amplifier for compensating the loss by the gain of EDFA, and the left half of fiber is doped by quantum dots as saturable absorber. Saturable absorber provides the optical bistbility and EDFA reduces the switching power of the system. The system is modeled by the semiclassical Lamb theory. The effect of system parameters such as different ring length, coupler reflectivity, erbium and quantum dots concentration on the bistability behavior is taken into consideration. It is shown that the switching power is about 10 mW.
Keywords:
Optical Bistability ; Quantum Dot ; Erbium Doped Fiber Amplifier ; Saturable Absorber

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