Evaluating the impact of doping concentration on the performance of in-band pumped thulium-doped fiber amplifiers

Mustafa A. Khamis

doi:10.1515/joc-2021-0157

Article

Evaluating the impact of doping concentration on the performance of in-band pumped thulium-doped fiber amplifiers

Mustafa A. Khamis

Published/Copyright: October 7, 2021

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From the journal Journal of Optical Communications Volume 45 Issue 2

Abstract

This study is to investigate the impact of thulium concentration on the performance of in-band pumped thulium-doped silica fiber amplifiers with considering ion–ion interactions. Due to the fluorescence quenching in silica glass, the fluorescence lifetimes are required to compute at every Tm concentration. The theoretical model of fluorescence decay curves at in-band pumped thulium-doped silica fiber is used to determine the fluorescence lifetimes of the ³F₄ and ³H₄ levels. The calculated lifetimes of the commercially available thulium-doped silica fiber are 650 µs for ³F₄ level and 14 µs for ³H₄ level and these results are consentient well with the experimental reported results. The theoretical evaluating of the amplifier performance shows that the gain amplifier reduces with concentration increase because of the impact of both fluorescence quenching and the reverse cross-relaxation process. Thus, in contrast to pumping wavelength at 790 nm, there are negative effects of the high doping concentration of Tm ions on the amplifier performance at the in-band pumping scheme.

Keywords: cross-relaxation process; in-band pumped scheme; silica glass; thulium-doped fiber amplifier

Corresponding author: Mustafa A. Khamis , Middle Technical University, Baquba Technical Institute, Baghdad, Iraq, E-mail: mustafaelectronic@gmail.com

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-07-09

Accepted: 2021-09-21

Published Online: 2021-10-07

Published in Print: 2024-04-25

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Articles in the same Issue

https://doi.org/10.1515/joc-2021-0157

Keywords for this article

cross-relaxation process; in-band pumped scheme; silica glass; thulium-doped fiber amplifier