Spectroscopic characterization of bismuth active centres in germanosilicate optical fibers: Impact of Ge concentration on E–S band amplifier gain

Halder, Arindam and Kakaei, Zahra (2026) Spectroscopic characterization of bismuth active centres in germanosilicate optical fibers: Impact of Ge concentration on E–S band amplifier gain. Journal of Luminescence. (doi:10.1016/j.jlumin.2026.121844).

Record type: Article

Abstract

Demonstrate an optimized fabrication process for bismuth germanium doped silica glass fiber using MCVD process with solution doping technique and reported the requirement of ∼7mol% germanium to achieve recorded ∼41dB gain with ∼3-7dB noise figure at E-S band in a single pass configuration.

Reporting a details spectroscopic study on bismuth active centres responsible for achieving ∼41dB gain in E-S band to identify the nature of bismuth oxidation state i.e. Bi(0).

Highlights

Modeling the observed spectral transition using an energy level diagram of Bi(0) to explain all the spectral process and E-S band gain properly.

Reporting the glass host dependency on the absorptions and emissions of bismuth active centres and its effects on E-S band amplifier outputs.

This study will help to get a good control on bismuth germanium doped fiber fabrication and their application on E-S band amplifier.

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