Abstract
Two different techniques were used to extend the dynamic range of analog
optical links operating at microwave frequencies. The link noise figure was
reduced by adjusting the bias point of an external Mach–Zehnder intensity
modulator. The link distortion was reduced by linearizing the transfer function
of the intensity modulator. Frequency conversion was implemented using an
additional optical modulator and electrical local oscillator rather than a
conventional electronic mixer. A microwave frequency signal transport link
was demonstrated with a spur-free dynamic range (SFDR) of 71 dB in a 500-MHz
noise bandwidth. A link with down-conversion from a microwave frequency to
an intermediate frequency was demonstrated with an SFDR of 64 dB in a 500-MHz
noise bandwidth.
© 2008 IEEE
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