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Showing 2008Show all
2 papers · 1 filter
physics.optics2008★ 1 cited
Visible and near infra-red up-conversion in Tm3+/Yb3+ co-doped silica fibres under 980 nm excitation
David A. Simpson, Keith W. E. Gibbs, Stephen F. Collins +5
The spectroscopic properties of Tm3+/Yb3+ co-doped silica fibers under excitation at 980 nm are reported. Three distinct up-conversion fluorescence bands were observed in the visib…
cs.IT2008★ 55 cited
Channel Capacity Limits of Cognitive Radio in Asymmetric Fading Environments
Himal A. Suraweera, Jason Gao, Peter J. Smith +2
Cognitive radio technology is an innovative radio design concept which aims to increase spectrum utilization by exploiting unused spectrum in dynamically changing environments. By…