Kramers-Kronig analysis of the absorption change in fiber gratings

Michel J. F. Digonnet

doi:10.1117/12.258964

20 November 1996 Kramers-Kronig analysis of the absorption change in fiber gratings

Michel J. F. Digonnet

Proceedings Volume 2841, Doped Fiber Devices; (1996) https://doi.org/10.1117/12.258964
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

We apply a Kramers-Kronig model to several published experimental studies of photosensitivity in Ge-doped silica to calculate the predicted index change (Delta) n_KK from the measured change in the absorption spectrum. In most cases (Delta) n_KK is close to the measured index change (Delta) n_exp. Most of (Delta) n_KK arises from absorption changes between 165 and approximately 195 nm. In the few cases where (Delta) n_KK is much smaller than (Delta) n_exp, the absorption spectrum was not measured below 200 nm, which is probably the reason for the discrepancy. Based on several observations, we also make the hypothesis that in the majority of our study population, color centers are probably responsible for most of the observed absorption change, and thus of the index change.

Citation Download Citation

Michel J. F. Digonnet "Kramers-Kronig analysis of the absorption change in fiber gratings", Proc. SPIE 2841, Doped Fiber Devices, (20 November 1996); https://doi.org/10.1117/12.258964

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