Abstract
Integrating an ultrawideband-over-fiber (UWBoF) system into a wavelength
division multiplexing passive optical network (WDM-PON) is of great interest
due to the high potential to provide high data-rate and flexible wired and
wireless services with a favorable cost. In this paper, we perform a comprehensive
study on an impulse radio UWBoF system compatible with the WDM-PON architecture
implemented based on a photonic microwave bandpass filter. The bandpass filter
is a two-tap delay-line filter implemented using either a polarization modulator
(PolM) or a phase modulator (PM), which is used to simultaneously shape an
electrical Gaussian-like pulse to an optical UWB pulse and reduce the out-band
noise and interference. The features of the photonic microwave bandpass filters
are theoretically studied. The photonic microwave bandpass filter based on
a PolM would produce a chirp-free UWB signal, while the one based on a PM
would generate a UWB signal that is insensitive to fiber dispersion. A single-channel
UWBoF system with ON–OFF keying, biphase modulation, and pulse-position
modulation without and with time hopping are experimentally studied. The experimental
results agree well with the theoretical predictions. A four-channel UWBoF
broadcasting network as well as a hybrid WDM-PON network to provide both wireless
and wired services is also experimentally investigated. Results show that
a conventional WDM-PON network could be easily upgraded to provide UWB services
by incorporating the proposed photonic microwave bandpass filter.
© 2011 IEEE
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