Er doped oxide nanoparticles in silica based optical fibres

Authors: Blanc, Wilfried; Dussardier, Bernard; Paul, Mukul C.

Source: Glass Technology - European Journal of Glass Science and Technology Part A, Volume 50, Number 1, February 2009 , pp. 79-81(3)

Publisher: Society of Glass Technology

Buy & download fulltext article:

Price: $30.00 plus tax (Refund Policy)

Abstract:

Erbium doped materials are of great interest in optical telecommunications due to the Er³⁺ intra-4f emission at 1·54 μm. Erbium doped fibre amplifiers (EDFA) were developed in silica glass because of the low losses at this wavelength and the reliability of this glass. Developments of new rare earth doped fibre amplifiers aim to control their spectroscopic properties including shape and width of the gain curve and optical quantum efficiency. Standard silica glass modifiers, such as aluminium, result in very good properties in current EDFA. However, for more drastic spectroscopic changes, more important modifications of the rare earth ions local environment are required. To address this aim, we present a fibre fabrication route creating rare earth doped calcia-silica or calcia-phosphosilica nanoparticles embedded in silica glass. By adding alkaline earth elements such as calcium, in low concentration, one can obtain a glass with an immiscibility gap so that phase separation occurs with an appropriate heat treatment. We investigated the role of two elements: calcium and phosphorus (a standard silica modifier). Scanning electron microscopy shows that nanoparticles are only observed when calcium is incorporated. The size of the particles is determined to be around 50 nm in preform samples. The nature of these particles depends on phosphorus content: without P, electron diffraction shows that the particles are amorphous whilst they are partially crystalline when phosphorus is added. In addition through use of energy dispersive x-ray techniques, we have shown that erbium ions are located in the nanoparticles.

Document Type: Research article

Publication date: 2009-02-01