The invention provides an optical bistable device applied to an all-
optical switch and an
optical memory, which belongs to the technical field of all-
optical communication systems. The optical bistable device has a multilayer structure formed by eight first
dielectric layers, eight second
dielectric layers and fifteen
graphene layers, specifically from the upper surface to the lower surface in sequence, a first
dielectric layer, a
graphene layer, a second
dielectric layer, a
graphene layer, a first
dielectric layer, a graphene layer, a second
dielectric layer, a first dielectric layer, a graphene layer, a second dielectric layer, a first dielectric layer, a graphene layer, a second dielectric layer, a graphene layer, a second dielectric layer, a graphene layer, a first dielectric layer, agraphene layer, a second dielectric layer, a graphene layer, a first dielectric layer, a graphene layer, a second dielectric layer, a graphene layer, a first dielectric layer, a graphene layer, a second dielectric layer, a graphene layer and a first dielectric layer. The optical bistable device applied to the all-
optical switch and the
optical memory has the advantages of reducing the optical bistable threshold.