Analysis of color-center-related contribution to Bragg grating formation in Ge:SiO2 fiber based on a local Kramers-Kronig transformation of excess loss spectra

被引：24

作者：

Leconte, B ^{[1
]}

Xie, WX ^{[1
]}

Douay, M ^{[1
]}

Bernage, P ^{[1
]}

Niay, P ^{[1
]}

Bayon, JF ^{[1
]}

Delevaque, E ^{[1
]}

Poignant, H ^{[1
]}

机构：

[1] FRANCE TELECOM,CTR NATL ETUD TELECOMMUN,LAB DIRECT TRANSMISS & DISTRIBUT TRAITEMENT SIGNA,F-22301 LANNION,FRANCE

来源：

APPLIED OPTICS | 1997年 / 36卷 / 24期

关键词：

optical fiber; UV absorption; Kramers-Kronig analysis;

D O I：

10.1364/AO.36.005923

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

UV-induced excess losses have been measured at various pulse energy densities and exposure times in germanosilicate optical fiber preform cores. The corresponding refractive-index changes have been determined through a Kramers-Kronig analysis. Because of the nonlinear behavior of the excess losses as a function of both exposure time and fluence per pulse, one should be careful when comparing the refractive-index modulation deduced from such measurements with that obtained from Bragg grating reflectivity. Indeed nonlinear effects such as saturation imply that it is necessary to take into account the local character of the change in absorption to calculate the evolution of the refractive-index modulation accurately as a function of the exposure time. Implications of these results are discussed. (C) 1997 Optical Society of America.

引用

页码：5923 / 5930

页数：8