The disclosed apparatus may include (1) a plurality of monochromatic emitter arrays, where each of the plurality of monochromatic emitter arrays has a plurality of emitters disposed in a two-dimensional configuration and emits a monochromatic image of a corresponding color, (2) a waveguide configuration that includes (a) a top surface, (b) a bottom surface disposed opposite the top surface, (c) a coupling area that receives the monochromatic images, and (d) a decoupling area that projects a plurality of instances of a polychromatic image including a combination of the monochromatic images toward an eyebox through the bottom surface, and (3) an actuator system that produces lateral shifting of the plurality of instances of the polychromatic image between at least two positions relative to the waveguide configuration. Various other methods and systems are also disclosed.

Optical spectroscopy is a widely used method to identify the chemical composition of materials and the characteristics of optical signals. Silicon based integrated photonics offers a platform for many optical functions through microelectromechanical systems (MEMS) and microoptoelectromechanical systems (MOEMS), silicon waveguides, integrated CMOS electronics and hybrid integration of compound semiconductor elements for optical gain. Accordingly, it would be beneficial to provide advanced optical tools for techniques such as optical spectroscopy and optical tomography exploiting MOEMS to provide swept filters that offer improved performance, increased integration, reduced footprint, reduced power consumption, increased flexibility, reconfigurability, and lower cost. Further, such MOEMS elements can support the provisioning of swept optical sources, swept filters, swept receivers etc. in the planar waveguide domain without free space optics.

An eyepiece for a head-mounted display includes one or more first waveguides arranged to receive light from a spatial light modulator at a first edge, guide at least some of the received light to a second edge opposite the first edge, and extract at least some of the light through a face of the one or more first waveguides between the first and second edges. The eyepiece also includes a second waveguide positioned to receive light exiting the one or more first waveguides at the second edge and guide the received light to one or more light absorbers.

A package structure comprises photonic dies and an interposer structure. Each photonic die includes a dielectric layer and a first grating coupler embedded in the dielectric layer. The interposer structure is disposed below the photonic dies. The interposer structure includes an oxide layer and a second grating coupler embedded in the oxide layer. The photonic dies are optically coupled through the first grating couplers of the photonic dies and the second grating coupler of the interposer structure.

There is disclosed in one example a fiberoptic communication circuit for wavelength division multiplexing (WDM) communication, including: an incoming waveguide to receive an incoming WDM laser pulse; an intermediate slab including a demultiplexer circuit to isolate n discrete modes from the incoming WDM laser pulse; n outgoing waveguides to receive the n discrete modes, the outgoing waveguides including fully-etched rib-to-channel waveguides; and an array of n photodetectors to detect the n discrete modes.

Provided are a Bragg grating and a spectroscopy device including the same. The Bragg grating is disposed at each of opposite ends of a resonator for reflecting light of a certain wavelength band and includes a core member extending from a waveguide of the resonator in a lengthwise direction of the waveguide; a plurality of first refractive members protruding from the core member and spaced apart from each other along the lengthwise direction; and a second refractive member filling spaces between the first refractive members and having a refractive index different from a refractive index of the first refractive members.

An eyepiece for a head-mounted display includes one or more first waveguides arranged to receive light from a spatial light modulator at a first edge, guide at least some of the received light to a second edge opposite the first edge, and extract at least some of the light through a face of the one or more first waveguides between the first and second edges. The eyepiece also includes a second waveguide positioned to receive light exiting the one or more first waveguides at the second edge and guide the received light to one or more light absorbers.

The optical device coupleable to a waveguide to receive an optical signal from the waveguide generally has at least two optical grating devices optically coupled to one another and having corresponding spectral responses, the spectral response of at least one of said optical grating devices being tunable to adjust an amount of overlapping between the spectral responses of the at least two optical grating devices.

A package structure comprises photonic dies and an interposer structure. Each photonic die includes a dielectric layer and a first grating coupler embedded in the dielectric layer. The interposer structure is disposed below the photonic dies. The interposer structure includes an oxide layer and a second grating coupler embedded in the oxide layer. The photonic dies are optically coupled through the first grating couplers of the photonic dies and the second grating coupler of the interposer structure.

Embodiments herein describe a dual-layer Bragg grating that can be used as a dual-bandpass filter. In one embodiment, the dual-layer Bragg grating comprises at least two layers, each having an anti-symmetrical structure. In addition, the anti-symmetrical structures can have different pitches which are tuned to different bands. That is, the pitch of the anti-symmetrical structure in one layer can be set to reflect a first band in a received optical signal while the pitch of the anti-symmetrical structure in the other layer is set to reflect a second band in the received optical signal.