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Selectively oxidized single-mode GaAs vertical-cavity surface-emitting lasers are investigated for biased 3-Gb/s and bias-free 1-Gb/s data links. Bit-error rates of better than 10/sup -11/ for pseudorandom data transmission over 4.3 km of standard 1300-nm single-mode fiber are demonstrated. A simple mode filter is used to suppress intermodal dispersion. The requirements of the gigabit ethernet are fulfilled even for bias-free operation.