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External control of semiconductor nanostructure lasers

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/13160

External control of semiconductor nanostructure lasers

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Title: External control of semiconductor nanostructure lasers
Author: Naderi, Nader A.
Advisor(s): Lester, Luke
Committee Member(s): Christodoulou, Christos
Hossein-Zadeh, Mani
Grillot, Frederic
Department: University of New Mexico. Dept. of Electrical and Computer Engineering
Subject(s): Semiconductor Lasers, Quantum Dot, Quantum Dash, Optical Injection-Locking, Dual-Mode Distributed Feedback Laser
LC Subject(s): Semiconductor lasers.
Quantum dots.
Nanostructures.
Degree Level: Doctoral
Abstract: Novel semiconductor nanostructure laser diodes such as quantum-dot and quantum-dash are key optoelectronic candidates for many applications such as data transmitters in ultra fast optical communications. This is mainly due to their unique carrier dynamics compared to conventional quantum-well lasers that enables their potential for high differential gain and modified linewidth enhancement factor. However, there are known intrinsic limitations associated with semiconductor laser dynamics that can hinder the performance including the mode stability, spectral linewidth, and direct modulation capabilities. One possible method to overcome these limitations is through the use of external control techniques. The electrical and/or optical external perturbations can be implemented to improve the parameters associated with the intrinsic laser’s dynamics, such as threshold gain, damping rate, spectral linewidth, and mode selectivity. In this dissertation, studies on the impact of external control techniques through optical injection-locking, optical feedback and asymmetric current bias control on the overall performance of the nanostructure lasers were conducted in order to understand the associated intrinsic device limitations and to develop strategies for controlling the underlying dynamics to improve laser performance. In turn, the findings of this work can act as a guideline for making high performance nanostructure lasers for future ultra fast data transmitters in long-haul optical communication systems, and some can provide an insight into making a compact and low-cost terahertz optical source for future implementation in monolithic millimeter-wave integrated circuits.
Graduation Date: July 2011
URI: http://hdl.handle.net/1928/13160

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