Abstract
A ridged lithium niobate electrooptical (EO) modulator with low driving
voltage and reduced size is proposed. In particular, the electrodes of the
proposed device are extended to the sidewalls of the ridge slopes to make
the electric and optical fields much more overlapped than those reported.
For a more detailed simulation, the electric and optical fields involved in
the overlap integral are numerically calculated rather than by using approximate
analytic solutions. Experimental results show that the half-wave voltage is
reduced by at least 15% in comparison to that of an EO modulator without
extended electrode configuration. As both the electrode length and gap are
decreased, the device sizes can be reduced by about 18%.
© 2008 IEEE
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