Patent ID: 8463081
Filing Date: 2013-06-11
Classification: G02F

Abstract:
1. An optical phase modulator for modulating phase of an optical signal propagating therein, the optical phase modulator comprising an electro-optical substrate and an optical waveguide formed thereon or therein for guiding the optical signal, wherein the optical waveguide comprises first and second waveguide portions optically coupled in series at a first stitch point, wherein the first and second waveguide portions comprise first and second materials, respectively; the optical phase modulator further comprising an electrode structure formed on or in the electro-optical substrate for creating an electric field in the first and second waveguide portions for modulating the phase, wherein the first and second waveguide portions are characterized, in conjunction with the electrode structure, by first and second time drifts of magnitudes of their respective electro-optical responses when the electric field is applied by the electrode structure to the first and second waveguide portions; wherein the first and second time drifts are of opposite sign, whereby the time drift of the first waveguide portion at least partially compensates the time drift of the second waveguide portion, thereby lessening a time drift of an overall electro-optical response of the optical phase modulator.