The goal of EAM-VCSEL project is to develop a cost- and energy-effective laser-source technology for short range Tb/s optical data communications links by extending the high-speed capability of VCSELs to beyond what is possible using direct current modulation. Therefore, the main objective is to demonstrate single-channel data rates in the 100 Gbps range under operating conditions and environmental requirements as set by relevant applications. Our technological approach consists in the monolithic integration of an electro-absorptive modulation structure in the vertically stacked VCSEL layout. By decoupling the electrical and optical designs of the modulator from the laser, one can optimize the ultra-high speed performances. Beyond this, we will also consider alternative modulation formats (multilevel, sub-carrier) to further extend the data transmission capacity, or the potential for high-microwave frequency radio-over-fiber transmission.