Abstract
We have developed a high-current photodiode (PD) array module that
consists of a beam splitter, which splits a light beam from a single-mode
fiber into four beams with identical powers, a backside-illuminated InGaAs
p-i-n PD array, and a two-stage Wilkinson RF power combiner. To obtain a
linear PD response, the PD is equipped with a partially depleted absorber,
which reduces the bias voltage. To prevent thermal failure, the
backside-illuminated PD structure is used, which reduces the thermal
resistivity. The beam splitter is fabricated using optical contacts at the SiO$_{2}$ interfaces between a coating film and a neighboring prism to
prevent degradation of the adhesive glue at the prism interfaces along the
optical path; therefore, light with a power of a watt level can be used. The
two-stage Wilkinson combiner combines four RF outputs of the PD array into a
single-RF output through a K connector; the combiner also works as an
impedance-matching circuit. Experimental results reveal that an RF power
output of 29.0 dBm can be obtained at a frequency of
5GHz, and good intermodulation distortion
characteristics with a third-order intercept point of 32.5 dBm can be
achieved.
© 2010 IEEE
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