A resonant optical modulator includes an electro-optical substrate, an optical
waveguide formed in the substrate and having a variable index of refraction, and
an active modulator electrode formed on the substrate in relation to the waveguide
to effect electro-optical variation of the index of refraction upon application
to the electrode of a modulating signal. An interface port formed on the substrate
provides the modulating signal to the electrode from a signal source and has an
impedance. An electrical structure, formed on the substrate and coupled to the
interface port and the electrode, makes an impedance of the optical modulator substantially
equal to the impedance of the signal source. The electrical structure includes
a delay line and a stub formed on the substrate.
