Fiber-optic transmission and networking: the previous 20 and the next 20 years [Invited] Winzer, Peter J. ; Neilson, David T. ; Chraplyvy, Andrew R. Abstract Publication: Optics Express Pub Date: September 2018 DOI: 10.1364/OE.26.024190 Bibcode: 2018OExpr..2624190W