Abstract
We demonstrate experimentally that the efficiency of writing a long-period fiber grating in a single-mode fiber by 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 laser heating. Controlling the axial stress distribution along a fiber during the 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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