Abstract
Domain inversion (DI) is applied to traveling-wave integrated electrooptic (EO) LiNbO<sub>3</sub> modulators to achieve predefined EO frequency response and improved
performance with respect to standard single-domain (not domain-inverted) counterparts, including lower driving
voltages and larger modulation bandwidths. In particular, when an appropriate poling (DI) is performed along the
interaction length, two novel configurations are envisaged. 1) An apodised longitudinal poling profile is used in
non-velocity-matched (NVM) modulators to achieve a desired EO response, such as amplitude modulation with intrinsic
third-order Bessel-type optical filtering for duobinary transmission. 2) Two-section longitudinal poling is used to
counteract the detrimental microwave loss effect in VM modulators and to increase the bandwidth to driving voltage
ratio, achieving a value up to 50% larger than that of single-domain (unpoled) structure.
© 2007 IEEE
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