Abstract

A process for creating a local high fiber birefringence and large variation in refractive-index modulation with a polarization in fiber Bragg gratings using postwriting exposures with femtosecond pulses is presented. A birefringence as high as ~8×10<sup>-4</sup> was obtained in the core of SMF-28 fiber by exposing the cladding of the fiber in close proximity to the core/cladding interface with a modulated multibeam interference field created by a phase mask. The birefringence is likely due to the induced stress rather than the direct asymmetric refractive index modification.

© 2007 IEEE

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