Abstract
We demonstrate a new technique for improving
the linearity of a microwave photonic signal transmission link. The method
employs a single conventional lithium-niobate phase modulator at the transmitter,
with two different <i>C</i>-band optical wavelengths
that are polarized along orthogonal axes of the modulator. The spurious-free
dynamic range is shown to improve by 15 dB compared to a single-wavelength
unlinearized system. Unlike earlier schemes that require continuous control
and adjustment at the transmitter in order to maintain linearity, the new
method enables all of the linearization to be controlled at the receiver end.
© 2008 IEEE
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