We demonstrate the first complete nonlinear optical-loop mirror demultiplexing experiments including error-rate measurements. Broad-band demultiplexing of 16, 32, and 64 Gb/s, 2(15) - 1 data was performed using only semiconductor lasers. The penalty for demultiplexing a 64 Gb/s time-division multiplexed data stream to the 4 Gb/s fundamental rate was 2.2 dB at an error rate of 10(-9). The switching pulse energy was 1.1 pJ.