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Proceedings Paper

Angled launch techniques using vertical-cavity surface-emitting lasers for gigabit data links
Author(s): Matthew Webster; Ian H. White; Richard V. Penty
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Paper Abstract

We report experimental evidence for bandwidth collapse occurring in links employing vertical cavity lasers under conventional launching conditions. Small launch misalignments are found to result in link bandwidths up to 40% below the modal bandwidth of the fiber with eye closure penalties of 4 dB. This effect can cause gigabit/s link lengths to be limited to less than previously thought. By implementing restricted mode launches using angled launch techniques we show that significant performance improvements are achievable. In particular, by adopting an angle of 8 degree(s) between the launch axis and the fiber end face we show that the transmission bandwidth is 100% greater than the 550 Mhz.km fiber bandwidth for a wide range of launch misalignments.

Paper Details

Date Published: 29 April 1999
PDF: 11 pages
Proc. SPIE 3627, Vertical-Cavity Surface-Emitting Lasers III, (29 April 1999); doi: 10.1117/12.347098
Show Author Affiliations
Matthew Webster, Univ. of Bristol (United Kingdom)
Ian H. White, Univ. of Bristol (United Kingdom)
Richard V. Penty, Univ. of Bristol (United Kingdom)


Published in SPIE Proceedings Vol. 3627:
Vertical-Cavity Surface-Emitting Lasers III
Kent D. Choquette; Chun Lei, Editor(s)

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