title: Observation of Q-switching and mode-locking in two-section InAs/InP (100) quantum dot lasers around 1.55 mum.
abstract: First observation of passive mode-locking in two-section quantum-dot lasers operating at wavelengths around 1.55 mum is reported. Pulse generation at 4.6 GHz from a 9 mm long device is verified by background-free autocorrelation, RF-spectra and real-time oscilloscope traces. The output pulses are stretched in time and heavily up-chirped with a value of 20 ps/nm, contrary to what is normally observed in passively mode-locked semiconductor lasers. The complete output spectrum is shown to be coherent over 10 nm. From a 7 mm long device Q-switching is observed over a large operating regime. The lasers have been realized using a fabrication technology that is compatible with further photonic integration. This makes the laser a promising candidate for e.g. a mode-comb generator in a complex photonic chip.
authors: Martijn J R
authors: MJ
authors: Heck
authors: Erwin A J M
authors: EA
authors: Bente
authors: Barry
authors: B
authors: Smalbrugge
authors: Yok-Siang
authors: YS
authors: Oei
authors: Meint K
authors: MK
authors: Smit
authors: Sanguan
authors: S
authors: Anantathanasarn
authors: Richard
authors: R
authors: Nötzel