To study soliton excitations in a polariton condensate with defects, we use the Gross–Pitaevskii equation and its hydrodynamic form. An extra term is added to
The three-component Gross–Pitaevskii equation with an angular momentum rotational term can be served as a model to study spinor Bose–Einstein condensates (BEC
An InP optical 90?hybrid based on a ×4 MMI coupler with a deep ridged waveguide is designed and fabricated. The working principle of the 90?hybrid is systemati