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IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 43, NO. 11, NOVEMBER 2007 1109 Relaxation Oscillations and Pulse Stability
 

Summary: IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 43, NO. 11, NOVEMBER 2007 1109
Relaxation Oscillations and Pulse Stability
in Harmonically Mode-Locked
Semiconductor Lasers
Farhan Rana and Paul George
Abstract--In this paper, we discuss pulse dynamics in harmoni-
cally mode-locked semiconductor lasers and present the conditions
necessary for stability. In a laser mode-locked at the th har-
monic, the pulse energy fluctuations have ( +1) different modes
of relaxation oscillations. Different modes correspond to different
patterns for the energy fluctuations in the different pulses inside
the laser cavity. In the higher order relaxation oscillation modes,
the energy fluctuations are negatively correlated in different pulses
inside the laser cavity, and these modes can cause instability. Gain
saturation on time scales of the order of the pulse width (dynamic
gain saturation) stabilizes pulse energy fluctuations with respect to
relaxation oscillations. The precise limits on the stable operating
regime depend on the gain dynamics at both slow and fast time
scales. We also discuss harmonic mode-locking in the presence of
a slow saturable absorber. Dynamic loss saturation in a saturable

  

Source: Afshari, Ehsan - School of Electrical and Computer Engineering, Cornell University

 

Collections: Engineering