Abstract

Reflecting Bragg filters having some polarizing properties can be photoinduced in monomode optical fibers exposed to a linearly polarized laser beam. Their reflectivity does indeed reach a maximum when the polarization direction of a reading beam is parallel to the polarization direction of the writing beam. This behavior is independent of the relative angle between the polarization direction of the writing beam and the birefringence axes of the fiber. These polarizing properties disappear for long exposure times of the fiber to the writing beam. From these results we conclude that the photosensitization process is not uniform over a cross section of the fiber; and periodic modification of the refractive index is anisotropic and therefore a small photoinduced birefringence exists. We have verified that effect; this result gives more weight to the hypothesis that the photoinduced filters are essentially phase gratings.

© 1985 Optical Society of America

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