Laser light coupling into SOI CMOS photonic integrated circuit

A hybrid laser for generating radiation, the hybrid laser comprising an optical passive material and an optical active material, the hybrid laser furthermore comprising:

• a first optical waveguide and optical laser components defined in the optical passive material,
• a second optical waveguide defined in the optical active material,
• wherein the second optical waveguide is positioned at least partly over the first optical waveguide so that an evanescent coupling interface is defined between the second optical waveguide and the first optical waveguide to couple radiation from the second optical waveguide to the first optical waveguide,
• the optical laser components comprising reflectors, the reflectors defining a cavity and being arranged to provide laser cavity confinement for the radiation in the first optical waveguide and the second optical waveguide by means of overlap of an optical mode guided by the second optical waveguide and the optical laser components,
• wherein the hybrid laser is arranged to provide amplification of the radiation in the second optical waveguide,
• the evanescent coupling interface between the first and the second optical waveguides being positioned within the cavity, and
• the first optical waveguide is arranged to couple out radiation from the hybrid laser.