Abstract
High accuracy and low noise measurement of the phase of a microwave signal requires that spurious
contributions are adequately dealt with. In this paper we investigate the power-to-phase coupling in two commercial
high bandwidth P-I-N, near-IR photodetectors. We observe that a sudden change of the optical power induces a transient
of the phase of the 20 GHz signal, at different time scales. The temperature rise of the photodetector junction
is likely to be involved in this dynamical behaviour. The value of the bias voltage applied to the photodetector
appears to control the size of the phase transients, as well as the optical power for which the slope of the
amplitude-to-phase coupling cancels. The most efficient way to reduce amplitude to phase couplings consists in
implementing optical demodulation, instead of electrical demodulation, of the microwave signal.
© 2014 IEEE
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