Title :
A 56Gb/s PAM-4 VCSEL driver circuit
Author :
Quadir, N. ; Ossieur, P. ; Townsend, Paul D.
Author_Institution :
Photonic Syst. Group, Univ. Coll. Cork, Cork, Ireland
Abstract :
We present a driver circuit that can modulate a VCSEL with a 56Gb/s (28Gbaud/s) 4-level pulse-amplitude-modulated (PAM-4) signal. High power efficiency is achieved using a common-source driver topology that only draws the modulation current corresponding to the PAM-4 symbol being transmitted. A Gray encoder based on MOS Current-Mode Logic (MCML) gates is included on chip, as well as programmable PAM-4 bias and modulation levels.
Keywords :
CMOS logic circuits; current-mode logic; driver circuits; logic gates; pulse amplitude modulation; surface emitting lasers; 4-level pulse-amplitude-modulated signal; MCML gates; MOS current-mode logic gates; PAM-4 VCSEL; PAM-4 signal; PAM-4 symbol; bit rate 56 Gbit/s; common-source driver topology; driver circuit; gray encoder; programmable PAM-4 bias; MCML gate; VCSEL driver; pulse amplitude modulation;
Conference_Titel :
Signals and Systems Conference (ISSC 2012), IET Irish
Conference_Location :
Maynooth
Electronic_ISBN :
978-1-84919-613-0
DOI :
10.1049/ic.2012.0204
