Abstract

UV-excited poling of a germanosilicate fiber with a large electric field applied across internal electrodes [1] has recently been reported to enhance/create a large linear electro-optic (EO) effect. The effect, based on the second-order nonlinearity in a germanosilicate fiber, is much larger than that produced by thermal poling [2], UV- excited poling has the further advantage of spatial resolution which is useful for creating periodic poled structures for applications such as quasi phase-matching SHG and EO-tunable gratings. In this work, we report on a process whereby the second-order nonlinearity (EO coefficient) in a fiber was increased more than six-fold over previously published bulk poling. In addition, we report the first demonstration of electrically tunable Bragg gratings at 1.53 μm induced by UV-excited poling in a germanosilicate fiber.

© 1995 Optical Society of America