Abstract
The dependences of Brillouin frequency shifts (BFSs) on strain and temperature
in GeO<sub>2</sub>-doped
optical fibers are investigated. Our study shows that the strain (temperature)
coefficient of the BFS is linearly proportional to the decrease of the GeO<sub>2</sub> concentration
in the fiber core with a relative rate of -1.48% (-1.61%)
per unit mol percentage. The coefficients of 0 mol% GeO<sub>2</sub>-doped silica (i.e., pure silica) are
extracted from the least squares fitted linear dependences of the coefficients
on GeO<sub>2</sub> concentration;
the results show good agreement with simulations taking into account the changes
of the refractive index, the density, and the Young's modulus induced by the
applied strain and the temperature change. Furthermore, when measurement upon
three fibers drawn from the same preform, but under different draw tensions
are done, this provides that there exists an optimized tension during fiber
fabrication that maximizes the difference between strain and temperature coefficients.
© 2008 IEEE
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