This paper investigates influence of the
linewidth enhancement factor on the output of
980-InGaAs/InP fiber grating lasers operating under strong
optical feedback. The study is based on intensive numerical
integration of an improved time-delay rate equations of
semiconductor lasers over wide ranges of the linewidth
enhancement factor and ratio of the grating reflectivity to
that of the anti-reflecting front facet. The results show that
the laser operates in continuous wave and pulsation at small
values of the linewidth enhancement factor. Under large
values of the factor, the laser happens to exhibits chaos and
pulsation. However, such pulsation is predicted to be more
stable due to locking of the laser oscillation at the external
cavity resonance frequency