Show simple item record

dc.contributor.advisorCampbell, Joeen
dc.creatorLi, Xiaowei, 1970 May 5-en
dc.date.accessioned2011-08-01T14:51:49Zen
dc.date.available2011-08-01T14:51:49Zen
dc.date.issued2004-08en
dc.identifier.urihttp://hdl.handle.net/2152/12696en
dc.descriptiontexten
dc.description.abstractFor high power and high frequency optical links such as CATV, optical phased array antenna and photonic analog-to-digital converter systems, high linearity and large dynamic range are essential. In the digital domain, the highest sensitivities for 40Gb/s receivers can be achieved by incorporating an erbiumdoped-fiber-amplifier (EDFA) or semiconductor-optical-amplifier (SOA) directly in front of the photodetecter and eliminating the electrical post-amplifier. However, primary limiting factors for high-speed and high-saturation-current photodetecters are the space charge effect and thermal failure. A partially depleted absorber (PDA) photodiode is a novel approach that incorporates space charge balancing by placing a p-doped absorber and an n-doped absorber on each side of the i-region. The p-doped absorber injects electrons into the i-region while the ndoped absorber injects holes. Furthermore, the photodiode is designed with a thinned i-layer that reduces space-charge screening and minimizes thermal effects across the depletion layer. Since the PDA photodiode utilizes undepleted absorbing regions, it can accommodate thicker absorbing layers while simultaneously taking advantage of the thermal and space charge benefits of a thin depletion layer. A record high saturation-current bandwidth product was achieved. PDA photodiodes are promising for improving the performance of photoreceivers when the photodiodes are implemented with SOA in a waveguide structure. The second part of the dissertation contributes to a novel technique for calculating the gain distribution of an avalanche photodetecter by numerical solution of the recursive equations. This method yields the average gain, the multiplication noise, and gain distribution curves. The results were compared to previously reported measurements and simulations.
dc.format.mediumelectronicen
dc.language.isoengen
dc.rightsCopyright is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en
dc.subjectOptical detectorsen
dc.subjectPhotodiodesen
dc.subjectOptical detectors--Mathematical modelsen
dc.titleHigh-speed and high-saturation-current partially depleted absorber photodetecters [i.e. photodetectorsen
dc.rights.holderRestricteden
dc.description.departmentElectrical and Computer Engineeringen
thesis.degree.departmentElectrical and Computer Engineeringen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record