Y. Champagne et N. Mccarthy, ANALYSIS OF THE STABILITY OF MULTIPLE-PHASE-SHIFT DISTRIBUTED-FEEDBACK SEMICONDUCTOR-LASERS, Canadian journal of physics, 71(1-2), 1993, pp. 29-38
The effects of the longitudinal spatial hole burning on the static las
ing characteristics of a specific configuration of distributed-feedbac
k semiconductor laser with three phase-shift regions are investigated
using a numerical approach. A serious degradation of the stability of
the optimum design, having the flattest axial intensity distribution a
t low output power, is predicted for drive levels beyond a critical va
lue. The lasing wavelength exhibits a sudden shift (wavelength chirpin
g), along with a significant degradation of the single-mode character
of the longitudinal-mode spectrum. Thus, the potentialities of this mu
ltiple-phase-shift structure to provide a stable narrow-linewidth emis
sion at high output power appear to be less than expected from results
calculated for the near-threshold regime. Nevertheless, it is found t
hat a multiple-phase-shift configuration that departs slightly from th
e optimum case suffices to recover most of the promises expected from
this distributed-feedback laser design.