Mechanisms of refractive index change under UV irradiation in some doped SiO2 core optical fibers

Bertrand Poumellec; Pascal Bernage; Isabelle F. Riant

doi:10.1117/12.258963

20 November 1996 Mechanisms of refractive index change under UV irradiation in some doped SiO2 core optical fibers

Bertrand Poumellec, Pascal Bernage, Isabelle F. Riant

Proceedings Volume 2841, Doped Fiber Devices; (1996) https://doi.org/10.1117/12.258963
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

Citation Download Citation

Bertrand Poumellec, Pascal Bernage, and Isabelle F. Riant "Mechanisms of refractive index change under UV irradiation in some doped SiO2 core optical fibers", Proc. SPIE 2841, Doped Fiber Devices, (20 November 1996); https://doi.org/10.1117/12.258963

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