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An integrated laser diode driver was realised using enhancement/depletion 0.3 mu m recessed-gate AlGaAs/GaAs quantum well transistors. Fully-open eye diagrams were observed at bit rates up to 10 Gbit/s with 50 Omega loads. The maximum DC and modulation current were 25 and 45 mA, respectively. The power consumption is less than 450 mW.