Abstract: Large mode area optical fibers include cores that are selected to be smaller than a core size associated with a minimum mode field diameter of a lowest order mode. Cross-sectional shape of such cores can be circular or annular, and a plurality of such cores can be used. Gain regions can be provided in cores or claddings, and selected to produce a selected state of polarization.

Abstract: A near eye display including: a first optical waveguide having a direction of elongation, at least one pair of parallel faces, and a first coupling-out mechanism; a second optical waveguide having an input aperture, a pair of parallel faces, and a second coupling out-mechanism; an optical coupling between the first optical waveguide and the second waveguide, the optical coupling including at least an air gap configured to enable total internal reflection within the first waveguide, and an interface window, the interface window comprising a transparent optical element with a refractive index substantially the same as a refractive index of the second optical waveguide; and wherein at least a portion of the interface window projects beyond the input aperture of the second optical waveguide such that undesired light exiting the first waveguide is prevented from entering the second waveguide.

Abstract: A method for fabricating a photonic device is provided. The method includes forming an optical coupler and a waveguide structure connected to the optical coupler over a semiconductor substrate; forming a metal-dielectric stack over the optical coupler and the waveguide structure; etching a hole in the metal-dielectric stack and vertically overlapping the optical coupler; and forming a protection layer on a sidewall and a bottom of the hole.

Abstract: In one embodiment, an apparatus includes a cold plate comprising a first side and a second side, a photonic integrated circuit connected to a substrate positioned on the second side of the cold plate, and an optical path extending through the cold plate and optically coupled to the photonic integrated circuit for transmitting an optical signal between the photonic integrated circuit and the first side of the cold plate.

Abstract: A capillary-type lens array having an inorganic glass around a graded index lens, in which a plurality of the graded index lenses and the inorganic glass are physically fused.

Abstract: In one embodiment, an apparatus includes an upper cold plate and a lower cold plate, at least one of the upper cold plate or the lower cold plate comprising an electrical or optical path extending therethrough, a substrate and die package interposed between the upper cold plate or the lower cold plate, and a connector coupled to one of the upper cold plate or the lower cold plate for transmitting power or an optical signal through the electrical or optical path to the substrate and die package.

Abstract: A 90-degree optical hybrid includes two optical splitters that respectively split inputted light into two beams, two optical combiners that respectively combine two beams of inputted light and thereby output two beams of interfering light respectively, and four arm waveguides that input light splitted by any of the two optical splitters into any of the two optical combiners. Each of the four arm waveguides has a bend waveguide arranged at its center and a plurality of optical waveguides including a tapered waveguide having a width that decreases toward the bend waveguide. Both ends of each of the plurality of optical waveguides are respectively in contact with a end surface of any one of the two optical splitter, the two optical combiners, the bend waveguide and the other of the plurality of optical waveguides, and each of the plurality of waveguides is the tapered waveguide or a linear waveguide.

Abstract: The single mode optical fiber disclosed herein has a core, an inner cladding, a trench and an outer cladding, along with a non-glass protective coating. The refractive index profile of the optical fiber is such that the optical fiber has relatively low bend loss at both small and large bend diameters. The relative refractive indices of the inner cladding, trench and outer cladding are such that a tunneling point that arises during bending is pushed out beyond the trench and thus sufficiently far away from the core so that bending losses for both small and large radius bends are relatively small.

Abstract: The technology described herein relates to a wavelength selective switch (WSS). An output port arrangement solution of an optical fiber array of the WSS includes: centers of output ports are arranged along a curve or along a combination line that includes a line segment, and a straight line connecting centers of any two output ports on the curve or the combination line does not pass through an input port. A light beam received from the input port is diffracted to the output ports through an LCoS panel, and a straight line that all diffraction orders that are generated after the diffraction pass through intersects with the curve or the line segment, and there is only one intersection point.

Abstract: An example head-mounted display device includes a plurality of optical elements in optical communication. The optical elements are configured to project an image in a field of view of a user wearing the head-mounted display device. A first optical element is configured to receive light from a second optical element. The first optical element defines a grating at along a periphery of the first optical element. The grating includes a plurality of protrusions extending from a base portion of the first optical element. The protrusions include a first material having a first optical dispersion profile for visible wavelengths of light. The grating also includes a second material disposed between at least some of the plurality of protrusions along the base portion of the first optical element. The second material has a second optical dispersion profile for visible wavelengths of light.

Abstract: Embodiments include a multimode interference (MMI) device with offset facets. The MMI device includes a first set of facets positioned on opposite edges of the MMI device with an optical path between the set of facets. The MMI device also includes a second set of facets positioned on opposite edges of the MMI device, where the second set of facets are offset from the first set of facets, where a second optical path passes through the MMI device between the second set of facets.

Abstract: Embodiments of an optical fiber cable configured for installation in a roadbed are provide. The optical fiber cable includes an optical fiber, a cable jacket surrounding the optical fiber, and an upjacket surrounding the cable jacket. The upjacket does not leach a chemical or chemicals into the roadbed that soften the roadbed. Also provided are embodiments of a method of producing an optical fiber cable configured for installation in a roadbed. Further, embodiments of a method of deploying an optical fiber cable into a roadbed are provided. The method involves the steps of forming a channel in the roadbed, inserting an optical fiber cable into the channel, and closing the channel so as to bury the optical fiber cable in the roadbed.

Abstract: A wall-mounted enclosure having a standard forward-facing opening but also having an expanded enclosure behind the opening. The opening allows the use of conventional prior art components (such as cover plates). The expanded enclosure allows a more generous bend radius for the creation of a service loop in a fiber optic cable or similar component.

Abstract: The present disclosure relates more to mode mixing optical fibers useful, for example in providing optical fiber laser outputs having a desired beam product parameter and beam profile. In one aspect, the disclosure provides a mode mixing optical fiber for delivering optical radiation having a wavelength, the mode mixing optical fiber having an input end, an output end, a centerline and a refractive index profile, the mode mixing optical fiber comprising: an innermost core, the innermost core having a refractive index profile; and a cladding disposed about the innermost core, wherein the mode mixing optical fiber has at least five modes at the wavelength, and wherein the mode mixing optical fiber is configured to distribute a fraction of the light input at its input end from its lower-order modes to its higher-order modes.

Abstract: Structures including a grating coupler and methods of forming a structure that includes a grating coupler. The grating coupler includes segments that are positioned with a spaced relationship on a slab layer. The segments contain an active material configured to have a first state with a first refractive index and a second state with a second refractive index in response to an applied stimulus. The first and second states may be produced by applying different sets of bias voltages to the segments as the applied stimulus.

Abstract: An enclosure includes a base and at least three members joined to the base, each member having inner and outer walls and extending upward from the base to form at least a first opening and a second opening along an outer surface formed by the outer walls of the members and an interior space bounded by the inner walls, where the first opening and the second opening are wide enough to accommodate one or more cables routed from the first opening to the second opening along the inner wall of the member positioned between the first opening and the second opening, and where the inner wall positioned between the first opening and the second opening has a radius of curvature that prevents a cable routed from the first opening to the second opening along the inner wall from bending beyond a minimum bend radius.

Abstract: An optical phase shifter and a method of making the same are disclosed. The phase shifter includes a substrate, a p-doped electrode and an n-doped electrode on the substrate, a first doped semiconductor layer on the p-doped electrode or the n-doped electrode and in electrical contact with the other electrode, a second doped semiconductor layer on the first doped semiconductor layer, a first vertical region electrically connecting the second doped semiconductor layer with the one electrode, and a cladding layer on or over the second semiconductor layer, the first vertical region, and at least a first sidewall of each of the first and second semiconductor layers. The p-doped electrode and the n-doped electrode form a p-n junction at an interface therebetween. The first and second doped semiconductor layers have the same doping type as the other electrode and the one electrode, respectively.

Abstract: A non-radial array of microstructure elements provides enhanced wavelength selective filtering. The elements are arranged along a line that does not intersect the center of the core. In this configuration, the first coupling element in an array that is nearest to the core is a non-integer array unit spacing from the main waveguide where the array unit spacing is defined as the flat to flat distance of a hexagonal cell.

Abstract: Photonic devices having Al1-xScxN and AlyGa1-yN materials, where Al is Aluminum, Sc is Scandium, Ga is Gallium, and N is Nitrogen and where 0<x?0.45 and 0?y?1.

Abstract: Light detection devices and corresponding methods are provided. The devices include a reaction structure to contain a reaction solution and at least one reaction site that generates light emissions in response to incident excitation light after treatment with the reaction solution. The devices also include a plurality of light sensors and device circuitry. The devices further include a plurality of light guides extending toward at least one corresponding light sensor from input regions that receive the excitation light and the light emissions from at least one corresponding reaction recess. The light guides comprise a first filter region that filters the excitation light and permits the light emissions of a first wavelength to pass to the at least one corresponding light sensor, and a second filter region that filters the excitation light and the permits light emissions of a second wavelength to pass to the at least one corresponding light sensor.