  Proteresis, a complementary effect to well-known hysteresis, is an
interesting phenomenon to be explored. As we know, the hysteric device is a
bistable switch whose states depend on the system's history whereas the
proteretic device states' depend on the future. Though an all-optical
implementation of the hysteric device has been demonstrated but its
complementary behavior has yet to be contrived. Therefore, this work presents
the design and development of an all-optical proteretic system using
semiconductor ring lasers. The design was achieved by providing a constraint
feedforward path to a hysteric feedback system. Additionally, the role of
various parameters was studied in order to achieve proteresis. It is observed
that the proteretic effect can be achieved only for specific conditions
otherwise the system behaves as a traditional hysteric device. The experimental
results match well with the theoretical Simulink results.
