Ultrawide tunable Er soliton fiber laser amplified in Yb-doped fiber Fermann, M. E. ; Galvanauskas, A. ; Stock, M. L. ; Wong, K. K. ; Harter, D. ; Goldberg, L. Abstract Publication: Optics Letters Pub Date: October 1999 DOI: 10.1364/OL.24.001428 Bibcode: 1999OptL...24.1428F