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Photonic generation of microwave signals : a quantum dot mode locked laser as a microwave source

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/20968

Photonic generation of microwave signals : a quantum dot mode locked laser as a microwave source

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Title: Photonic generation of microwave signals : a quantum dot mode locked laser as a microwave source
Author: Atmatzakis, Georgios
Advisor(s): Christodoulou, Christos
Committee Member(s): Lester, Luke
Gilmore, Lester
Department: University of New Mexico. Dept. of Electrical and Computer Engineering
Subject: laser, photonic generation of microwave signals, quantum-dot, mode-locking, hybrid mode-locking, quantum-dot mode-locked laser, injection locking, load-pull, conjugate matching, loadline matching, impedance tuner, bias-tee, quasi-circulator, active antenna array, antenna array, beamforming, power combining, wirebond, microstrip patch antenna, microstrip patch antenna with RF-choke
LC Subject(s): Microwave devices.
Mode-locked lasers.
Quantum dots.
Microwave antennas.
Degree Level: Masters
Abstract: Microwave signals can be photonically generated inside a quantum dot, passively mode locked laser. In order for this laser to be used as a microwave source, a microwave interface was created and connected to the laser. To characterize the source, its output microwave impedance was measured by using the load-pull technique. Also, the device was characterized in terms of output power, frequency and linewidth. The output frequency of the generated signal was 5GHz with a linewidth <2MHz. The output power that was extracted was as high as -6dBm without any further amplification. An active antenna element was connected to the laser to transmit the generated microwave signal. In addition, the injection locking of the laser to an external source was studied and demonstrated, as a way to increase the stability of the output microwave signal and to amplify its power by combining the output signals of multiple locked sources. Further applications of the laser as a feeding source in an antenna array were studied by building a quantum dot laser fed active microwave antenna array with injection locked sources.
Graduation Date: July 2012
URI: http://hdl.handle.net/1928/20968


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