Abstract
We describe 480 Mbps, bi-directional ultra-wideband (UWB) radio signal
transmission over 1 km of single-mode optical fiber. Key components are a
highly linear, reflective electro absorption transducer (EAT) and commercially
available 1308-nm and 1564-nm VCSELs with 4.8-GHz bandwidth. Detailed EAT
and 1308-nm VCSEL distortion analyses and measurements are presented highlighting
the low intermodulation and harmonic distortion necessary for typical >$-$18-dB
wireless channel error vector magnitudes (EVMs). Direct VCSEL modulation with
Wimedia supported band group 1 (3.1–4.8 GHz) MB-OFDM UWB signals was
modelled with VPItransmissionMaker, suggesting a minimum EVM of $-$18.733 dB at 0.4502 OMI. This was confirmed
by 480 Mbps upstream and downstream EVM measurements over fiber of $-$21.4 dB or better.
Fully functional, half-duplex, bi-directional data transfer was achieved with
interlocked RF switches.
© 2009 IEEE
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