Abstract
The characteristics of zero-biased InGaAs p-i-n photodiodes were studied
for use as optical transducers in an in situ phased array
radar calibrator. Radio frequency (RF) operation is especially important for
the intended application in which the zero-biased photodiodes drive patch
antennas embedded in a radome. The photodiodes act as sources for real-time
calibration of the phase and amplitude of each array element and will operate
with only optical input from a modulated optical fiber link. Unfortunately,
little is known of the RF performance of photodiodes operated without voltage
bias. In this paper, both the dc and RF performance of a particular photodiode
were studied to determine the optimum operating conditions and to understand
the type and severity of any limitations.
© 2008 IEEE
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