Eur. Phys. J. AP 3, 5-8 (1998)
https://doi.org/10.1051/epjap:1998197

Measurement of pump induced refractive index change in Er³⁺ doped fiber by two-mode interferometry

Laboratoire de Physique de la Matière Condensée (CNRS-UMR 6622), Université de Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex, France

Corresponding author: saissy@naxos.unice.fr

Received: 30 October 1997
Revised: 15 April 1998
Accepted: 30 April 1998
Published online: 15 July 1998

Abstract

We α present and demonstrate a method to determine the refractive index and absorption changes in a two mode fiber interferometer. Measurement on the 632 nm transitions in Er³⁺ silica fiber shows that refractive index and absorption changes result from ground and excited state transitions respectively. The GSA/ESA cross-sections ratio was found to be 14.