An apparatus including a waveguide region configured to guide light propagating along a first direction; a reflector region configured to reflect incident light; an interference region formed between the waveguide region and the reflector region, the interference region configured to confine at least a portion of interference light formed by the incident light and the reflected incident light; and a grating region including a grating formed on a region confining at least a portion of the interference light, the grating configured to couple at least a portion of the light along a second direction that is different from the first direction.

An optoelectronic integrated circuit for coupling light to or from an optical waveguide formed in an optical device layer in a near-normal angle to that layer. In an embodiment, the integrated circuit comprises a semiconductor body including a metal-dielectric stack, an optical device layer, a buried oxide layer and a semiconductor substrate arranged in series between first and second opposite sides of the semiconductor body. At least one optical waveguide is formed in the optical device layer for guiding light in a defined plane in that device layer. Diffractive coupling elements are disposed in the optical device layer to couple light from the waveguide toward the second surface of the semiconductor body at a near-normal angle to the defined plane in the optical device layer. In an embodiment, an optical fiber is positioned against the semiconductor body for receiving the light from the coupling elements.

An augmented reality headset includes a projector and an eyepiece waveguide stack optically coupled to the projector. The eyepiece waveguide stack includes: a first eyepiece waveguide including a first incoupling diffractive optical element and a first combined pupil expander; and a second eyepiece waveguide including a second incoupling diffractive optical element and a second combined pupil expander. The second incoupling diffractive optical element is laterally offset from the first incoupling diffractive optical element in a lateral direction.

An optical waveguide device and an optical network are provided and relate to the field of optical communication technologies. The optical waveguide device and optical network perform dispersion compensation on dispersion generated in transmission of a transmission signal in a fiber. The optical waveguide device includes a first waveguide having an input end and an output end. A first grating is disposed between the input end and the output end of the first waveguide. The first grating includes a plurality of grating combs periodically distributed in an extension direction of the first waveguide. A grating parameter of the first grating presents chirp distribution. The grating parameter includes one or more of the following: a periodicity of the grating comb and a size of the grating comb.

An example optical device is disclosed, comprising a first optical waveguide and a second optical waveguide situated in proximity to the first optical waveguide. The first optical waveguide includes a first grating structure, while the second optical waveguide incorporates a second grating structure. The grating structures facilitate selective, directional coupling of specific wavelengths from the first waveguide to the second waveguide. The distance between the first and second optical waveguides varies along the interaction length so as to optimize the coupling efficiency and the extinction ratio (ER) of the device.