Zero-bias modulation of tapered-thickness waveguidelasers with semi-insulating blocking layer

Abstract
The authors demonstrate zero-bias modulation of narrow-beam-divergence tapered-thickness waveguide lasers. The reduction of the parasitic capacitance by introducing a semi-insulating blocking layer made the turn-on delay < 1 ns at 85°C, even when no bias voltage was applied. 155.52 Mbit/s penalty-free 40 km transmission under zero-bias conditions was achieved.