Influence of the linewidth-enhancement factor on the output and operations of InGaAs/InP pumping
lasers emitting at a wavelength of 980nm under strong optical feedback is investigated numerically. The
investigations are performed based on intensive numerical integration of an improved time-delay rate
equations of semiconductor lasers over wide ranges of the linewidth-enhancement factor and optical
feedback strength. The results show that the semiconductor laser operates under strong optical feedback in
continuous wave and pulsation at small values of the linewidth-enhancement factor. Under large values of
the linewidth-enhancement factor, the laser happens to exhibit chaos and pulsation. We predict that
semiconductor laser subjected to strong optical feedback exhibits much more stable pulsing operation
under higher values of the linewidth-enhancement factor, which indicates that the laser is locked at the
external cavity frequency.