Abstract

We report a large increase in photosensitivity of germanium-doped silicate fibers by rapid heat treatment of hydrogen-loaded fibers at 1000 °C before exposure of the fibers to 242-nm radiation. The increase in photosensitivity is compared with thermally induced absorption caused by introduction of massive amounts of hydroxyl species. The absorption loss was measured to be 0.02 dB/cm mol. % OH at $1.55 \mathit{\mu }\mathrm{m}$. Strong gratings $\left(\mathrm{\Delta }n>1\times {10}^{-4}\right)$ in germanium-free phosphorous-doped fibers in the presence of 242-nm radiation have also been manufactured by this technique.

© 2000 Optical Society of America

Grating formation in pure silica-core fibers

Jacques Albert, Michael Fokine, and Walter Margulis
Opt. Lett. 27(10) 809-811 (2002)

Ultraviolet-initiated reactions of H₂ with germanosilicate fibers and H₂ concentration dependence of the Bragg wavelength of a fiber grating

L. B. Fu, G. Tan, W. J. Xu, H. L. An, X. M. Cui, X. Z. Lin, and H. D. Liu
Opt. Lett. 25(8) 527-529 (2000)

Ultraviolet-induced absorption losses in hydrogen-loaded optical fibers and in presensitized optical fibers

J. Canning, M. Åslund, and P-F. Hu
Opt. Lett. 25(22) 1621-1623 (2000)

Solgel-derived photosensitive germanosilicate glass monoliths

A. D. Heaney and T. Erdogan
Opt. Lett. 25(24) 1765-1767 (2000)

Increase of photosensitivity in Ge-doped fibers under strain

E. Salik, D. S. Starodubov, and J. Feinberg
Opt. Lett. 25(16) 1147-1149 (2000)