Abstract
We propose an equivalent circuit model for the coplanar waveguide (CPW)
which serves as the traveling wave electrode to drive carrier-depletion-based
silicon modulators. Conformal mapping and partial capacitance techniques are
employed to calculate each element of the circuit. The validity of the model
is confirmed by the comparison with both finite-element simulation and experimental
result. With the model, we calculate the modulation bandwidth for different
CPW dimensions and termination impedances. A 3 dB modulation bandwidth of
15 GHz is demonstrated with a traveling wave electrode of 3 mm. The calculation
indicates that, by utilizing a traveling wave electrode of 2 mm, we can obtain
a 3 dB modulation bandwidth of 28 GHz.
© 2012 IEEE
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