Abstract
In this paper, we propose and demonstrate a bidirectional radio-over-fiber
(ROF) system using a reference signal distribution. In order to minimize the
radio-frequency (RF) signal attenuation as well as limit the transmit power
to moderate levels, small cell size, or picocell is used in the ROF system.
This will result in the need of many base stations (BSs) to provide
sufficient network coverage. Because of this, colorless remote antenna unit
(RAU) with optical carrier generated and distributed from the head end (HE)
is employed. Experimental results show that error-free signal transmission
and remodulation using downstream differential phase shift keying (DPSK) and
upstream on-off keying (OOK) is achieved in a 20-km reach ROF system.
Experimental characterization of the reflective semiconductor optical
amplifier (RSOA)-based remodulation unit is also performed. Numerical
simulation is performed to compare the proposed scheme with several
conventional optical millimeter-wave (mm-wave) schemes, including double
sideband (DSB), optical carrier suppression (OCS), and single sideband
(SSB). Results show that the proposed scheme could be a potential candidate
to mitigate signal distortions due to signal fading and code time
shifting.
© 2009 IEEE
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