Abstract
In this paper, we design, analyze, and demonstrate experimentally U.S.
Federal Communications Commission (FCC)-compliant power-efficient ultrawideband
(UWB) waveforms generated by optical pulse shaping. The time-domain pulse
shape is written in the frequency domain, and a single-mode fiber performs
the frequency-to-time conversion. The waveform is inscribed in the frequency
domain by the fiber Bragg grating (FBG). A significant challenge for this
approach is elimination of an unwanted, positive rectangular pulse superimposed
on the desired waveform. Our innovative use of balanced photodetection eliminates
this pedestal, assuring compliance with the FCC mask at low frequency. Three
UWB pulses with duration of 0.3, 0.6, and 1.2 ns are designed and tested experimentally.
Whereas an excellent match between the optimized and measured pulses is achieved
for the simpler, shorter duration waveforms, the noise in the fabrication
process of FBGs limits the generation of the more complex, longer duration
waveforms.
© 2008 IEEE
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