CO(2) laser writing of long-period fiber gratings in optical fibers under tension.
We demonstrate experimentally that the efficiency of writing a long-period fiber grating in a single-mode fiber by CO(2) 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 CO(2) laser heating. Controlling the axial stress distribution along a fiber during the CO(2) laser writing process thus provides an additional degree of freedom for control of the grating characteristics.
Liu
Yunqi
Y
Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong. eeksc@cityu.edu.hk
Chiang
Kin Seng
KS