A device includes an array of light emitters configured to generate multiple light beams to form an image, the image having a field of view and a planar waveguide having an edge configured to receive multiple light beams from the array of light emitters, each light beam associated with a portion of the field of view. The device also includes a lens array comprising multiple lenses linearly extended to overlap an edge portion of the planar waveguide, the lenses optically coupling the light beams into the planar waveguide, and one or more output couplers in the planar waveguide configured to direct the light beams into an eyebox, wherein the eyebox forms an area that includes a pupil of a viewer of the image.

Microring resonators are devices that includes a set of waveguides that guide light, where at least one of the waveguides is a closed loop that operates to increase an intensity of the light over each round-trip. Microring resonators can be configured to operate as light filters and/or light modulators, and have application, for example, in the field of optical communication technology. Due to temperature sensitivity of microring resonators, however, a heating device is needed to maintain a microring resonator at a desired temperature. The present disclosure provides a microring resonator heating device that includes at least two coaxially arranged contacts providing radial current flow to heat the microring resonator.

One embodiment described herein provides a co-packaged optics (CPO) switch assembly. The CPO switch assembly includes a switch integrated circuit (IC) chip and a number of optical modules coupled to the switch IC chip. The switch IC chip and the optical modules are co-packaged within a same physical enclosure. The switch IC chip includes a switch logic and a digital signal processing (DSP) unit, and a respective optical module comprises: a photonic integrated chip (PIC), a first amplifier module, and a second amplifier module.

Optical telecommunication receivers and transmitters are described comprising dispersive elements and adjustable beam steering elements that are combined to provide optical grid tracking to adjust with very low power consumption to variations in the optical grid due to various changes, such as temperature fluctuations, age or other environmental or design changes. Thus, high bandwidth transmitters or receivers can be provides with low power consumption and/or low cost designs.

An electro-optic combiner includes a polarization splitter and rotator (PSR) that directs a portion of incoming light having a first polarization through a first optical waveguide (OW). The PSR rotates a portion of the incoming light having a second polarization to the first polarization to provide polarization-rotated light. The PSR directs the polarization-rotated light through a second OW. Each of the first and second OW's has a respective combiner section. The first and second OW combiner sections extend parallel to each other and have opposite light propagation directions. A plurality of ring resonators is disposed between the combiner sections of the first and second OW's and within an evanescent optically coupling distance of both the first and second OW's. Each of ring resonators operates at a respective resonant wavelength to optically couple light from the combiner section of the first OW into the combiner section of the second OW.

Examples described herein relate to an optical device having a photonic-crystal lattice structure. In some examples, the optical device may include a substrate having a photonic-crystal lattice structure. The optical device may further include an optical waveguide formed in the photonic-crystal lattice structure and a defect cavity formed in the photonic-crystal lattice structure and optically coupled to the optical waveguide. Furthermore, the optical device may include a refractive index tuning structure adjacent to the defect cavity in the photonic-crystal lattice structure.

Disclosed is a photodetector with a resonant waveguide structure, including: a substrate; a light absorption layer located on the substrate and configured for detecting an optical signal; a resonant waveguide structure including a first waveguide portion and a second waveguide portion spaced apart; the first waveguide portion receives the optical signal and transmits the received optical signal to a first region of the second waveguide portion, the second waveguide portion includes a second region for coupling the optical signal to the light absorption layer, and the second waveguide portion provides a circular transmission path for transmission of the optical signal to transmit the optical signal that transmitted to the first region to the second region along part of the circular transmission path and retransmit the optical signal that flows through the second region without being coupled to the light absorption layer to the second region along the circular transmission path.

A curved reflective has at least one location having a radius of curvature in a range from about 6 mm to about 1000 mm. Each location on the reflective polarizer has a maximum reflectance greater than about 70% for a block polarization state, a maximum transmittance greater than about 70% for an orthogonal pass polarization state, and a minimum transmittance for the block polarization state. For a continuous first portion of the reflective polarizer extending between different first and second edges of the reflective polarizer and defining disjoint second and third portions of the reflective polarizer, the minimum transmittance of the reflective polarizer for the block polarization state is higher at each location in at least 70% of the first portion than at each location in at least 70% of the second portion and at each location in at least 70% of the third portion.

Optical whispering gallery mode (WGM) resonator-based acoustic sensors, imaging systems that make use of the acoustic sensors, and methods of detecting ultrasound waves using the acoustic sensors are disclosed.

Systems, devices, and techniques for performing wavelength division multiplexing or demultiplexing using one or more metamaterials in an optical communications systems are described. An optical device may be configured to shift one or more phase profiles of an optical signal using one or more stages of metamaterials to multiplex or demultiplex wavelengths of optical signals. The optical device may be an example of a stacked design with two or more stages of metamaterials stacked on top of one another. The optical device may be an example of a folded design that reflects optical signals between different stages of metamaterials.