Abstract

We demonstrate experimentally that the efficiency of writing a long-period fiber grating in a single-mode fiber by CO2 laser pulses increases significantly with the axial stress applied along the fiber. We attribute the enhancement in writing efficiency to the generation of nonuniform inelastic frozen-in strains across the fiber under tension by CO2 laser heating. Controlling the axial stress distribution along a fiber during the CO2 laser writing process thus provides an additional degree of freedom for control of the grating characteristics.

© 2008 Optical Society of America

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