High bit rate data transmission with monolithic InGaAsN VCSELs, emitting 70
0 muW in singlemode operation at room temperature, is demonstrated. Bit err
or rates of < 10(-11) are achieved for transmission over 20.5km of standard
singlemode fibre at 2.5Gbit/s. In back-to-back transmission 10Gbit/s is re
ached.