Abstract
We present the performance evaluation of impulse radio
ultrawideband (IR-UWB) over fiber using a simple pulse design technique with
a high fractional bandwidth. The technique, based on the linear combination
of the first-order Gaussian derivatives with different pulse-shaping factors,
shows full compliance with Federal Communications Commission mask requirements
even in the most severely power-restricted GPS band. We validated our approach
with experiments employing an intensity-modulation direct-detection scheme.
The experimental setup uses a directly modulated DFB laser at 1302.56 nm and
a multimode fiber-coupled photodetector with 24 $\mu$m diameter photosensitive area. The
transmission link consists of 25 km single-mode fiber or 4.4 km multimode
fiber. Error-free transmission at 2 Gb/s is achieved over both fiber links.
The result shows the proposed pulse-generation technique to be simple and
cost-effective compared to higher order Gaussian derivative schemes. This
can be implemented successfully to distribute UWB signals over optical links
for access and in-building networks.
© 2011 IEEE
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