Abstract
We analyze the operation and performance of subsampled analog optical
links. These links downconvert microwave signals by optically sampling at
a rate much lower than the RF carrier frequency. Expressions for conversion
gain, noise figure, and spurious-free dynamic range are derived for intensity
modulation and direct detection. The impact of pulse width on link performance
is revealed and quantified. Also, in order to characterize noise in a subsampled
link, the influence of timing jitter in the periodic optical source is considered.
Timing jitter and pulse width are found to be two important factors which
limit the noise figure and dynamic range in subsampled links.
© 2012 IEEE
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