Small signal analysis of frequency chirping in injection-locked semiconductor lasers

Fast 2R regeneration by coherent laser amplifiers

“…These equations are based on well-known models of the phase locking behavior of semiconductor lasers, with an additional equation for the signal mode and some modifications in notation [5]- [9]. Both electric fields and are considered as the slowly varying complex amplitudes of the coherent traveling waves with the steady-state cavity mode frequency removed, i.e.…”

“…The symbols appearing in the equations are the effective injection current , the volume of the optical cavity , carrier lifetime without stimulated emission taken into account , the speed of light in the medium , the modal gain and loss of the mode ( and ), the deviation of the cavity resonance of the mode from its steady-state value , the length of the cavity , and the external injection into the mode . The gain in (2)- (4) is modeled by (5) where is the maximum modal gain and is the transparency carrier density. The change in the frequency of the cavity mode is given by (6) with being the linewidth enhancement factor and the change in the modal gain with respect to its threshold value.…”

Nonlinear Photonic Signal Processing Subsystems and Applications

“…Single mode operation can be achieved (Kobayashi, 1980), a reduction of the spectral linewidth can also be observed. A reduction of frequency chirping of an injection locked laser is theoretically analyzed (Piazzolla et al, 1986) and demonstrated (Lin et al, 1985), and the mode partition noise can be suppressed (Iwashita & Nakagawa, 1982). The dispersion penalty for a signal generated by a current modulated laser can be greatly reduced by injection locking (Cartledge, 1990) and the crosstalk tolerance is also improved (Caspar et al, 1996).…”

Light polarization fingerprints on nonlinear dynamics of vertical-cavity surface-emitting lasers

“…Its application for semiconductor lasers is of great interest. Indeed, the injection locking of semiconductor lasers was shown to significantly improve the coherence properties of the emitted signal, leading for example to the reduction of the mode hopping and mode partition noise [48], the reduction of the laser linewidth [49] and of the frequency chirping [50], and an enhancement of the modulation bandwidth [51][52][53]. For telecommunication purposes, optical injection is for example interesting in the development of semiconductor laser arrays, injection locking has been demonstrated to operate conveniently by synchronizing an array of lasers onto a unique master [54].…”