Directly Modulated Single-Mode Tunable Quantum Dot Lasers at 1.3 µm

We demonstrate the first single-mode tunable InAs/GaAs quantum dot (QD) lasers at 1.3 µm. Without involving gratings or multiple epitaxial growths, 27-channel wavelength switching was achieved with side-mode-suppression-ratio of around 35 dB. Over 9 mW output power can be measured under continuous-wave electrical injection, with 716 kHz Lorentzian linewidth, 4 GHz 3-dB bandwidth, and 8-Gbit/s non-return-to-zero signal modulation.