Abstract
A compact sub-terahertz transceiver module integrating a
uni-traveling-carrier photodiode, a Schottky barrier diode, and a planar
circulator circuit has been developed. A 180-degree rat-race hybrid circuit
fabricated on a quartz substrate is employed as the circulator. All the
components are assembled in a compact rectangular-waveguide-output package
for operation in the J-band. The frequency dependence of the detection
sensitivity of the transceiver module showed clear resonant behavior at
around 270 GHz while the output power showed no distinct resonance. The
insertion loss of the circulator for the input and output signals at 270 GHz
were estimated to be 4.6 dB and 11.4 dB, respectively. The isolation between
the output port and the SBD port of the circulator was evaluated to be 14.3
dB at 270 GHz, indicating that the fabricated module functioned properly as
a transceiver. The linearity of the output power and the input sensitivity
of the transceiver were also confirmed to be very good. This is the first
demonstration of a photonic mm-wave transceiver module for continuous waves
operating at around 300 GHz.
© 2010 IEEE
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