Files in this item



application/pdfMong-Kai_Wu.pdf (4MB)
(no description provided)PDF


Title:Development of vertical cavity transistor laser and microcavity laser
Author(s):Wu, Mong-Kai
Director of Research:Feng, Milton
Doctoral Committee Chair(s):Feng, Milton
Doctoral Committee Member(s):Schutt-Ainé, José E.; Dallesasse, John M.; Goddard, Lynford L.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):vertical cavity transistor laser
microcavity laser
surface-emitting vertical-cavity lasers
energy efficient
Abstract:An energy-efficient semiconductor laser is of great interest for the massive data transmission demands in butt computing servers and supercomputing technologies. Currently, commercial vertical-cavity surface-emitting diode lasers (VCSELs) have achieved a data transmission rate of 25 Gbit/s per channel. However, the VCSEL bandwidth is limited by the slow recombination lifetime in the active region, which is the major challenge to transmitting at a data rate greater than 60 Gbit/s for a single VCSEL. To push the modulation speed, Purcell enhancement in the small volume and high Q cavity can be applied in microcavity VCSELs, enhancing the spontaneous recombination rate. In the first part of the dissertation we demonstrate that the microcavity VCSEL has a reduced recombination rate of 0.5 ns when the aperture size is less than 3 μm. With improved RF layout design and fabrication, we demonstrate a microcavity laser operating error-free at 40 Gbit/s. In the second part of the dissertation, we demonstrate the first vertical cavity transistor laser (VCTL) operation. Due to the dynamic charge transport in the active region, the transistor laser can achieve shorter carrier lifetime (~ 29 ps), making it especially suitable for high-speed lasers. We discuss the VCTL material and layout design, including how to reduce the parasitics via layout and process development. With three design iterations, we achieve a highly efficient VCTL.
Issue Date:2014-05-30
Rights Information:Copyright 2014 Mong-Kai Wu
Date Available in IDEALS:2014-05-30
Date Deposited:2014-05

This item appears in the following Collection(s)

Item Statistics