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Proceedings Paper

Modal noise simulations due to high-frequency VCSEL numerical aperture fluctuations
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Paper Abstract

We have experimentally identified and characterized two dynamic components of a VCSEL/multimode optical fiber link: (1) a high temporal frequency fluctuation of the VCSEL's numerical aperture (NA) and, (2) source power spectrum shift in time (chirp) both upon ac modulation. We use these variables of the excitation irradiance distribution at a fiber input to simulate the resulting modal noise; without the typical assumptions that all fiber modes are equally filled and all relative fiber mode delays are equally probable. Results indicate that fluctuations in the NA can generate significant modal noise at the fiber output. On the other hand, source chip, in the presence of mode selective loss, is only moderately effective in generating modal noise. Moreover, since chirping increases with the VCSEL's series resistance, it's significance will diminish as design efforts to decrease the potential drop across the VCSEL are successful.

Paper Details

Date Published: 5 May 1998
PDF: 8 pages
Proc. SPIE 3288, Optoelectronic Interconnects V, (5 May 1998); doi: 10.1117/12.307588
Show Author Affiliations
Shanalyn A. Kemme, Optical Sciences Ctr./Univ. of Arizona (United States)
Raymond K. Kostuk, Optical Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 3288:
Optoelectronic Interconnects V
Ray T. Chen; Julian P. G. Bristow, Editor(s)

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