Abstract
Resonant free-spectral-range (FSR) RF-optic modulators using dual-disc
resonators with a 2:1 ratio of the radii of the discs have been proposed and
theoretically analyzed to increase the sensitivity–bandwidth
product compared with that of a single resonator modulator. The transmission
of the coupled resonator structure is analyzed for various coupling
parameters. The phase of the larger resonator is electro-optically
modulated, and the output fields at the input laser frequency and the
generated sideband frequencies are calculated. The detected RF power is then
calculated. The modulator sensitivity, 3-dBe modulation bandwidth, and their
product have been analyzed. The sensitivity and modulation bandwidth can be
increased by factors of 1.9 and 6.4, respectively, for the different cases.
The sensitivity–bandwidth product can be increased up to a factor
of 3.3 in one design. For ${\pm}5\hbox{\%}$ error of the ratio of the radius of each disc, errors of the
sensitivity and modulation bandwidth were acceptable.
© 2010 IEEE
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