Abstract
Broadband access networks evolution towards 10-Gb/s user connectivity
will foster the evolution of the photonic and wireless technologies needed
to implement multi-Gb/s wireless links. In particular, provision of data rates
in excess of 1 Gb/s using wireless technologies is limited by currently available
electrical technologies due to the required bandwidths and frequencies of
operation in the millimeter-wave (mm-wave) band. Microwave photonic techniques
and technologies have shown a clear potential to overcome these limitations.
In this paper, the detailed study of a photonic vector modulator (PVM) architecture
and its performance limitations are presented. The PVM architecture is based
on direct baseband modulation and dispersion induced quadrature condition.
The limitation of this architecture is the presence of a local oscillator
(LO) component in the generated mm-wave spectrum which limits the system dynamic
range. To overcome this limitation, a third continuous-wave (CW) laser is
used to remove the unwanted LO component by properly adjusting its wavelength
and emitted power. After presenting the theoretical model, the LO suppression
feature is demonstrated experimentally by generating a 1.25-Gb/s QPSK 41-GHz
modulated carrier. The two options (with and without LO carrier) are compared
in terms of relevant performance parameters.
© 2008 IEEE
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