Evidence of a saturable-absorption effect in heavily erbium-doped fibers Colin, S. ; Contesse, E. ; Le Boudec, P. ; Stephan, G. ; Sanchez, F. Abstract Publication: Optics Letters Pub Date: December 1996 DOI: 10.1364/OL.21.001987 Bibcode: 1996OptL...21.1987C