Traveling-Wave Electro-Absorption Modulators(TWEAM)based on InP havebeen developed at KTH since the late 1990’s. State-of-the-art performance has been demonstrated with >100GHz -3dBe bandwidth and 2Vpp voltage swing for 10dB optical extinction ratio, making the TWEAM suitable for fiberoptical communication to above 100Gb/s with On-Off Keying (OOK) and Non-Return to Zero (NRZ) code. Monolithic integration with Distributed Feedback (DFB) lasers has also been developed. The applicability of the devices has been demonstrated by field-trials in a European project coordinated by KTH where all parts of a fiberoptical transmission link for 100GbE were developed to comply with realistic specifications in contact with standardization work. Future improvements include increased integration and efficiency.