Title :
Existence of intrinsic ´background loss´ in rare-earth doped fibres: drawbacks and usefulness
Author_Institution :
France Telecom, CNET, Bagneux, France
Abstract :
Estimates are given of the intrinsic multiphonon absorption of trivalent rare earth (RE) dopants in glasses. The orders of magnitude of 1.5 dB/km in ZBLAN glass and 3.5 dB/km in silica glass as far as 2000 cm-1 from an electronic transition can contribute to what is generally called the ´background loss´ and could explain why fibre lasers and amplifiers can be pumped outside usual electronic RE transitions.
Keywords :
aluminium compounds; barium compounds; fibre lasers; fluoride glasses; lanthanum compounds; light absorption; optical losses; optical pumping; silicon compounds; sodium compounds; zirconium compounds; ZBLAN glass; ZrF4-BaF2-LaF3-AlF3-NaF:Jk; background loss; fibre lasers; intrinsic multiphonon absorption; optical pumping; rare-earth doped optical fibres; silica glass; trivalent rare-earth dopants;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19930228
