Abstract

Passively and hybrid mode-locked (ML) quantum dot (QD) lasers are efficient sources of short pulses ideal for applications in high speed communication systems. The parameter range for which stable ML can be achieved is of importance for virtually all applications. Different regimes of operation can be distinguished for passively ML devices: non-lasing, Q-switching, mode-locking modulated by Q-switching, pure mode-locking, mode-locking with a cw offset and finally cw lasing. In lasers based on quantum dots the Q-switching instability is suppressed due to the strong damping of the relaxation oscillations induced by the fast carrier capture rate from the wetting layer to the dots [1].

© 2007 IEEE