Abstract
An impulse-radio ultrawideband (UWB) photonic generation technique based
on frequency shifting in the remote connectivity fiber in optical access networks
is proposed and analyzed in this paper. This technique is based on optical
carrier suppression modulation combined with fiber chromatic dispersion targeting
to overcome the bandwidth limitation of optical upconversion, with the advantage
of being easily reconfigurable generating simultaneously different RF bands.
A comprehensive simulation analysis is performed with special focus on capabilities
for dual 24 GHz/60 GHz operation paired with experimental demonstration at
1.24 Gb/s. 60 GHz wireless performance after optical generation and transmission
in 12.5km of standard single-mode fiber is measured demonstrating
error-free transmission at 1 m radio distance. The inclusion of remote Gaussian-monocycle
pulse shaping is also analyzed in this paper considering dual 24 GHz/60 GHz
operation. Pulse-shaped dual 24 GHz/60 GHz generation is experimentally demonstrated
at 1.24 Gb/s. Transmission performance is measured at 24 GHz demonstrating
error-free transmission. The simulation analysis further indicates that the
technique is suitable for UWB generation at higher RF bands such as the <i>W</i>-band (75–110
GHz). Practical implementation considerations and trade-offs (e.g., in terms
of cost and number of remote antenna units supported) of this system are also
analyzed by simulation showing that the technique is cost effective.
© 2011 IEEE
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