IR Bismuth active centers in optical fibers: Combined excitation-emission spectroscopy

TL;DR

This study investigates the excitation-emission spectra of bismuth-doped optical fibers with various compositions, revealing the energy level schemes of IR bismuth active centers and their similarities across different fiber types.

Contribution

It provides detailed excitation-emission spectra and derived energy level schemes for bismuth active centers in various doped optical fibers, expanding understanding of their luminescent properties.

Findings

Luminescence spectra obtained for multiple fiber types.

Energy level schemes of IR bismuth centers derived.

Similarities found in bismuth centers across silica and germania fibers.

Abstract

3D excitation-emission luminescence spectra of Bi-doped optical fibers of various compositions were measured in a wide wavelength range 450-1700 nm. Such luminescence spectra were obtained for Bi-doped pure silica and germania fibers, and for Bi-doped Al- or P-codoped silica fibers (at room and liquid nitrogen temperatures). The energy level schemes of IR bismuth active centers in pure silica and germania core fibers were derived from spectra obtained. The energy level schemes similarity of bismuth active centers in these two types of fibers was revealed.