We analyze theoretically nonlinear dynamics of an optically injected two-mode quantum dot laser lasing simultaneously from the ground and excited states. We show that although the external optical signal is injected into the ground-state mode alone, it can lead to the generation of regular picosecond pulses and pulse packages in the intensity of the excited-state mode. Generation of regular streams of picosecond pulses is attributed to an intrinsic gain switching mechanism where the relaxation time is modulated by the oscillations in the occupation of the ground and excited energy states.
© 2010 Optical Society of America
Lasers and Laser Optics
Original Manuscript: July 13, 2010
Revised Manuscript: September 11, 2010
Manuscript Accepted: September 17, 2010
Published: October 27, 2010
Lukasz Olejniczak, Krassimir Panajotov, Sebastian Wieczorek, Hugo Thienpont, and Marc Sciamanna, "Intrinsic gain switching in optically injected quantum dot laser lasing simultaneously from the ground and excited state," J. Opt. Soc. Am. B 27, 2416-2423 (2010)