35 GHz mode-locking of 1.3 μm quantum dot lasers

35 GHz passive mode-locking of 1.3 mum (InGa)As/GaAs quantum dot lasers is reported. Hybrid mode-locking was achieved at frequencies up to 20 GHz. The minimum pulse width of the Fourier-limited pulses was 7 ps with a peak power of 6 mW. Low uncorrelated timing jitter below 1 ps was found in cross correlation experiments. High-frequency operation of the lasers was eased by a ridge waveguide design that includes etching through the active layer. (C) 2004 American Institute of Physics.