Abstract
The performance of optical phase-modulated (PM) radio-over-fiber (RoF)
links assisted with coherent detection and digital signal processing (PM-Coh)
is analyzed and experimentally demonstrated for next-generation wireless-over-fiber
systems. PM-Coh offers high linearity for transparent transport of high-frequency
microwave signals, and better receiver sensitivity than intensity modulated
with direct detection systems. By including photonic downconversion in the
PM-Coh link, in a form of a pulsed free-running local oscillator, it is possible
to receive high-RF carrier frequencies, with low-bandwidth electronics. Analytical
assessment and simulations are used to determine the ultimate performance
with respect to laser linewidth, modulation index, and receiver sensitivity.
Then, two different scenarios are studied and experimentally demonstrated
as an application of PM-Coh links: a high-capacity multiantenna RoF system
(12 subcarriers of 400 Mb/s and 6 subcarriers of 800 Mb/s) and photonic downconversion
for the detection of high-RF carriers microwave signals (up to 3.2 Gb/s at
40 GHz).
© 2011 IEEE
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