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Proceedings Paper

Mechanisms of refractive index change under UV irradiation in some doped SiO2 core optical fibers
Author(s): Bertrand Poumellec; Pascal Bernage; Isabelle F. Riant
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Paper Abstract

In this paper, we describe the various behaviors of reflectivity and Bragg wavelength shift according to time and temperature when a grating is written in a germanosilicate core fiber. Four processes are pointed out which we have quoted type O, I, IIa, IIb. Then, they are analyzed. Type O is relevant of photochromism of color centers through Kramers-Kronig transformation. Type I is explained on the basis of densification induced by UV irradiation. Process giving rise to Type IIa is not yet known but the refractive index change is opposite to the others. Type IIb is an index change associated to ablation for open structure or fusion for closed ones. Finally, a general model is proposed interpreting the time-temperature dependence of the reflectivity and Bragg wavelength shift.

Paper Details

Date Published: 20 November 1996
PDF: 13 pages
Proc. SPIE 2841, Doped Fiber Devices, (20 November 1996); doi: 10.1117/12.258963
Show Author Affiliations
Bertrand Poumellec, Univ. de Paris-Sud (France)
Pascal Bernage, Univ. des Sciences et Technologies de Lille (France)
Isabelle F. Riant, Alcatel Alsthom Recherche (France)


Published in SPIE Proceedings Vol. 2841:
Doped Fiber Devices
Michel J. F. Digonnet; Francois Ouellette, Editor(s)

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