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MODULATION RESPONSE AND LINEWIDTH PROPERTIES OF
MICROCAVITY LASERS
by
Mahmood Bagheri
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
December 2008
Copyright 2008 Mahmood Bagheri
Object Description
| Title | Modulation response and linewidth properties of microcavity lasers |
| Author | Bagheri, Mahmood |
| Author email | mbagheri@usc.edu; mahmood_bagheri@yahoo.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2008-08-14 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-10-01 |
| Advisor (committee chair) | O'Brien, John |
| Advisor (committee member) |
Dapkus, P. Daniel Steier, William Lidar, Daniel Hashemi, Hossein |
| Abstract | Integrated optics is the ultimate solution for reducing the manufacturing and operational costs of optical circuits. The growing demand for high-bandwidth communication between integrated circuits has also initiated the interest in chipscale integrated optical circuits. Microcavity lasers as an indispensable part of such circuits, have been the subject of intensive research during the past two decades. There have been a lot of speculations on the dynamic properties of these lasers in the past, but to date, there has not been a comprehensive study and analysis of those properties on these lasers. Lack of experimental data providing enough feedback to the theories, has prevented the existing theories to mature. The goal of this thesis is to understand the modulation response and linewidth properties of these lasers through combining our experiments with the theory.; Chapter 2 reviews the optical microcavities investigated for this thesis. Their fabrication process is briefly presented, and their optical properties are reviewed.; Chapter 3 discusses the optical microcavity physics, and how microcavities can modify the electronic states lifetime. A derivation of this phenomenon based on the Wigner-Weiskopft theory of spontaneous emission is given and it is compared with a more detailed analysis based on system-reservoir theory of dissipation.; In chapter 4, a single mode laser rate equation is presented based on a semiclassical approach. Then Langevian noise sources are introduced to account for fluctuations of the laser field. In this chapter, the laser linewidth is derived and microcavity linewidth measurements are then presented. In the end, the effect of increased spontaneous emission rate on the linewidth of lasers in microcavities are investigated. It is shown that the increased spontaneous emission rates results in further broadening of the spectral width than what is expected in conventional lasers.; Chapter 5 presents the data on small signal intensity modulation response properties of microcavities. It is shown that these cavities are influenced by gain nonlinearities that ultimately limits the maximum achievable modulation bandwidth. The fiber transfer function technique is then applied to these cavities to extract their linewidth enhancement factors. It is shown that by including the carrier dynamics outside the quantum wells, reasonable agreement can be obtained between the theory and experiment. |
| Keyword | microcavity; semiconductor laser; laser noise; modulation response; quantum-well laser |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m1618 |
| Rights | Bagheri, Mahmood |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Bagheri-2362 |
| Archival file | uscthesesreloadpub_Volume14/etd-Bagheri-2362.pdf |
Description
| Title | Page 1 |
| Full text | MODULATION RESPONSE AND LINEWIDTH PROPERTIES OF MICROCAVITY LASERS by Mahmood Bagheri A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) December 2008 Copyright 2008 Mahmood Bagheri |
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