Abstract
We have designed and experimentally demonstrated radio-over-fiber
(ROF) systems to simultaneously generate optical millimeter-wave (mm-wave)
and centralized lightwaves using one low-bandwidth intensity modulator (IM)
with low-frequency local oscillator (LO) signals while simplifying the transmission
design and reducing the cost of the base station (BS). The techniques based
on double-sideband (DSB) and single-sideband (SSB) signals for ROF systems
are discussed in detail in terms of architecture efficiency, bandwidth requirement,
and fiber transmission performance. The repetitive frequency of the optical
mm-wave carriers are four times of that of the LO in central office (CO) by
using DSB scheme. Full-duplex transmission services have been successfully
realized over 20-km single-mode fiber (SMF) based on wavelength-reuse technique.
In order to mitigate chromatic dispersion, the SSB technique has also been
investigated in this paper. We had realized an ROF system that attained dispersion-free
transmission and a negative power penalty by using SSB generation. We also
quantified the optical carrier-to-sideband ratio (CSR) of downstream transmission
in this ROF link and established that the performance of ROF system can be
significantly improved when the optical signals are transmitted at a CSR value
of 0 dB. The proposed architectures require much less bandwidth of the modulators,
receiver sensitivity, system operation efficiency, and reliability.
© 2008 IEEE
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