Abstract
We present the first demonstration of an adaptive wideband radio-frequency (RF)
photonic link architecture suitable for high-dynamic-range microwave signal
fiber optic transport. The architecture incorporates feedforward (FF) linearization
to correct the electrical-to-optical (E/O) conversion nonlinearity as well
as optimized control loops that enable the system performance to be maintained
in real time during changing operating conditions. Third-order distortion
suppression of greater than 25 dB has been demonstrated over the input frequency
range of 2 GHz to > 17
GHz. Under manual control of the wideband FF linearized photonic link, a spur-free
dynamic range (SFDR) in excess of 120 dB-Hz<sup>2/3</sup> is demonstrated, while an SFDR of > 116 dB-Hz<sup>2/3</sup> is achieved with adaptive control. We present experimental results
of a fully automated wideband FF photonic link and also discuss the potential
for the technique.
© 2008 IEEE
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