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Proceedings Paper

VCSEL modal dynamics and implications for 100Gbps links
Author(s): Stephen E. Ralph; Justin Lavrencik
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Paper Abstract

Modulation rates of VCSELs within multimode fiber links are now 25Gbps as standardized by both IEEE and Infiniband. Yet the need continues to advance the serial data rates to 50Gbps and higher to more readily support 100Gbps links with manageable fiber count. At these higher modulation rates the multimode VCSEL dynamics cannot be accurately modeled as single mode sources coupled into a MMF modeled as a simple filter. Specifically, our recent experimental results demonstrate the limitations of the standard mode partition noise and relative intensity noise models. By direct measurement of VCSEL mode dynamics we have shown modal statistics to be comprised of a mix of both correlated and anti-correlated components with a correlation time of a few symbol periods at 100G. Through simulations and experiments we demonstrate that MPN is significantly over estimated in the standard modeling tools and that RIN is enhanced by fiber dispersive effects, an effect not currently captured by current standard modeling methods and potentially underestimated.

Paper Details

Date Published: 25 February 2017
PDF: 10 pages
Proc. SPIE 10122, Vertical-Cavity Surface-Emitting Lasers XXI, 101220E (25 February 2017); doi: 10.1117/12.2257030
Show Author Affiliations
Stephen E. Ralph, Georgia Institute of Technology (United States)
Justin Lavrencik, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 10122:
Vertical-Cavity Surface-Emitting Lasers XXI
Kent D. Choquette; Chun Lei, Editor(s)

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