Fiber optic phase modulator using electro-optic material in evanescent field

摘要

A cladded optical fiber is secured in a slot in a substrate which is ground and polished to access the evanescent field. A thin electro- optically active layer of PLZT is deposited on the top of the fiber substrate. A pair of parallel electrodes is then deposited on top of the crystal PLZT film. An electric field distribution parallel to the electro- optical film is generated at the center of the electrode gap by applying a voltage to the electrode pair so as to effect a phase shift of the light wave propagating in the fiber.