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MICRODISK-WAVEGUIDE SYSTEM FOR THE CONRTOL OF
THE POLARIZATION STATE OF LIGHT
by
Hooman Akhavan
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 PHILOSOHY
(ELECTRICAL ENGINEERING)
August 2007
Copyright 2007 Hooman Akhavan
Object Description
| Title | Microdisk-waveguide system for the control of the polarization state of light |
| Author | Akhavan, Hooman |
| Author email | hakhavan@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2007-08-17 |
| Date submitted | 2007 |
| Restricted until | Unrestricted |
| Date published | 2007-09-13 |
| Advisor (committee chair) | O'Brien, John D. |
| Advisor (committee member) |
Dapkus, Daniel Steier, William Haas, Stephen |
| Abstract | In optical fibers and photonic integrated circuits (PIC's), the signal polarization can undergo random rotations. Since strong confinement (SC) microphotonic devices are polarization sensitive, a chip-scale polarization rotator is beneficial for the realization of chip-scale integrated optics. Moreover, control over polarization states of photon(s) is necessary for realization of quantum information technology in optical domain. Optical microdisks vertically-coupled to a waveguide bus due to the precise control over coupling distance in fabrication and relative ease of dense integration have become increasingly important as a building block for photonic integrated circuits. Both passive and active devices have been demonstrated including channel dropping filters, tunable resonant filters and switches, intensity modulators, phase modulators, laser sources, and WDM demultiplexers.; In this research it has been proposed and experimentally observed preferential polarization mode conversion and signal amplification due to the existence of non-zero, asymmetric, and geometry dependent cross-polarization coupling coefficients between non-orthogonal modes of the waveguide and the vertically-coupled active microdisk. A theory based on coupled mode theory (CMT) is developed to realize microdisk-waveguide system as a narrowband polarization rotator.; An integrated structure consisting of a polarization splitter, a microdisk as a narrowband polarization rotator and a combiner is proposed to be applicable in fiber communication and integrated optics. A broadband polarization rotator on ridge waveguides was designed. However, it is concluded that microdisk application for a polarization rotator is helpful to reduce the device size at the cost of bandwidth. Tuning of the microdisk resonance is required when the operating wavelength is changed.; By incorporation of the two properties of the active microdisk as a polarization rotator and tunable phase shifter, two-microdisk device is demonstrated as a narrow-band amplifier and also a potential candidate to control the polarization state of light through its ability to span the Poincare sphere. This will promise applications in quantum information technology.; At the end, active microdisk application in an optical code division multiple access (OCDMA) system and the necessity of inclusion of a polarization rotator in this system has been examined. |
| Keyword | optics |
| 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 |
| Type | texts |
| Legacy record ID | usctheses-m818 |
| Rights | Akhavan, Hooman |
| 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-Akhavan-20070913 |
| Archival file | uscthesesreloadpub_Volume32/etd-Akhavan-20070913.pdf |
Description
| Title | Page 1 |
| Full text | MICRODISK-WAVEGUIDE SYSTEM FOR THE CONRTOL OF THE POLARIZATION STATE OF LIGHT by Hooman Akhavan 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 PHILOSOHY (ELECTRICAL ENGINEERING) August 2007 Copyright 2007 Hooman Akhavan |
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