A single-40Gb/s dual-20Gb/s serializer IC with SFI-5.2 interface in 65nm CMOS

This paper describes the prototype serializer (SER) IC for a 40 Gb/s optical transponder module featuring SFI5.2 input interface and two output modes, dual 20Gb/s and single 40Gb/s, to support SONET OC-768, SDH STM 256 and ITU G.709. The data rate covers from 21.5 to 22.3Gb/s for the dual-20Gb/s mode, and from 39.8 to 44.6Gb/s for the single-40Gb/s mode.