Impact of Damping on 50 Gbps 4-PAM Modulation of 25G Class VCSELs

Tamas Lengyel; Krzysztof Szczerba; Emanuel Haglund; Petter Westbergh; Magnus Karlsson; Anders Larsson; Peter Andrekson

doi:10.1109/JLT.2017.2727549

Impact of Damping on 50 Gbps 4-PAM Modulation of 25G Class VCSELs
Artikel i vetenskaplig tidskrift, 2017

We present an investigation into the effects of photon lifetime and the associated damping of the modulation response on 50 Gbps 4-PAM signal generation with directly modulated 25G class VCSELs. While 4-PAM benefits from higher slope efficiency and output power, it is shown that the greater impact of intensity noise and dynamic nonlinearities implies that a VCSEL with a longer photon lifetime and more damped response is needed when transitioning from existing 25 Gbps OOK to 50 Gbps 4-PAM using the 25G VCSEL technology.

interconnects

MMF

OOK

fiber-optical communication

inter-symbol interference

850 nm

IM/DD

Data communication

4-PAM

short-range

VCSEL