2026-09-19T21:39:11Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/44254 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Choquette, Kent D. Choquette, Kent D. Goddard, Lynford L. Ravaioli, Umberto Schutt-Ainé, José E. Tan, Meng Peun 2013-05-24T22:05:38Z 2013-05-24T22:05:38Z 2013-05 2013-05-24T22:05:38Z 2013-05 Vertical-cavity surface-emitting lasers (VCSELs) are currently the most popular light source for short-haul optical data communication primarily due to their low cost and low operating power. To address the needs for improved data rate, power consumption, and device lifetime, various approaches of digital modulation utilizing VCSELs with modified structures for mode control are presented. Direct modulation of VCSELs with separate optical and current apertures enables high modulation bandwidth of greater than 18 GHz operating single mode at low current density of less than 6 kA/cm2 because the current aperture diameter can be increased independent of the optical apertures. Polarization modulation of anisotropic VCSELs gives an extinction ratio of greater than 9 dB and at the same time requires low modulation amplitude of less than 200 mV, due to the orthogonality of the polarization states. To achieve polarization modulation requires the capabilities of polarization control and polarization switching. Finally, electro-optically modulated VCSELs with isolated cavity and modulator sections are shown to have the potential of digital modulation with a high data rate at low bias current. Design and fabrication of these VCSELs along with their characterization results will be presented, and approaches to improve their performance will also be suggested. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-01-24T22:26:08Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Tan_Meng Peun.pdf: 3079433 bytes, checksum: dff4910c7ee10942f431b04383703f0a (MD5) Made available in DSpace on 2013-05-24T22:05:38Z (GMT). No. of bitstreams: 2 Meng Peun_Tan.pdf: 3079891 bytes, checksum: 00a2a00e93b82afe76e55fd5dc33a3b1 (MD5) license.txt: 4062 bytes, checksum: cb9429fde001beccc4dbfe2657c1ec99 (MD5) http://hdl.handle.net/2142/44254 en Copyright 2013 Meng Peun Tan Vertical-cavity surface-emitting lasers photonic crystal optical communication transverse mode polarization electro-optic modulation Modulation approaches of vertical-cavity surface-emitting lasers with mode control text Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Electr & Computer Eng-UIUC 10KS1200PHD