Abstract
The distribution of ultra-wideband (UWB) signals over optical fiber, or
UWB over fiber (UWBoF), is proposed to extend the area of coverage and to
offer the availability of undisrupted service across different networks.
Various techniques have been reported recently for optical UWB pulse
generation, but the study on the implementation of different modulation
schemes based on these UWB pulses has just started. In addition, the
influence of fiber dispersion on the power spectral density (PSD) of an UWB
signal, and the bit-error-rate performance of an UWBoF system with different
modulation schemes have not been systematically investigated. In this paper,
we perform a comprehensive investigation of techniques to implement
on–off keying (OOK), bi-phase modulation (BPM), pulse-amplitude
modulation (PAM), pulse shape modulation (PSM), and pulse-position
modulation (PPM) based on a phase modulator and an asymmetric
Mach–Zehnder interferometer (AMZI). The AMZI is electrically
reconfigurable by employing a polarization modulator (PolM). UWB signals
with OOK, BPM, PAM, PSM, and PPM are realized by adjusting the polarization
controllers in the AMZI and the amplitude of the electrical drive signal to
the PolM. The UWB signals with OOK, BPM, PAM, and PSM are transmitted over a
wired (single-mode fiber) and wireless link. Error-free operation is
obtained for all the modulation schemes. The power penalties of transmission
are less than 1.8 dB. The fiber dispersion on the PSD of the UWB signals is
also theoretically studied and experimentally evaluated. An excellent
agreement between the theoretical and the experimental results is achieved.
The system is potentially integratable, which may provide a simple and
cost-effective solution for UWBoF applications.
© 2010 IEEE
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