Abstract: The present application provides a diffractive optical waveguide for optical pupil expansion and a display device, comprising a waveguide substrate having a coupling-in region in which a coupling-in grating is located and a coupling-out region. A first and a second diffractive light obtained by the input light diffracted by the coupling-in grating are respectively totally reflected in the waveguide substrate and directed to a first and a second coupling-out regions. A first coupling-out grating disposed in the first coupling-out region and a second coupling-out grating disposed in the second coupling-out region both are configured to couple at least a portion of light propagating therein out of the waveguide substrate by diffraction. The first and the second coupling-out regions are respectively located at both sides of the coupling-in region. A center of the coupling-in region deviates from the center line connecting the centers of the first and the second coupling-out regions.

Abstract: A modular assembly for opto-electronic systems has a substrate on which various photonic integrated circuit (PIC) chips and electronic integrated circuit (EIC) chips are mounted. One or more waveguide (WG) chips mounted on the substrate align the optical communication between the PIC chips and fiber blocks for optical fibers. Preconfigured electrical connections in the substrate allow the PIC and EIC chips to communicate with one another and to communicate with solder bumps on the substrate for integration of the modular assembly with other electronic components.

Abstract: A unitary optical ferrule is molded to include one or more elements for receiving and securing one or more optical waveguides one or more elements for affecting one or more characteristics of light from the optical waveguide while propagating the light within the ferrule. The optical ferrule also includes one or more first alignment features and one or more second alignment features that, when the ferrule is mated with a mating ferrule, each controls alignment of the ferrule with the mating ferrule along three mechanical degrees of freedom. The surface of the optical ferrule can be divided along the thickness axis into a first section and an opposing second section, wherein the first section of the surface includes the receiving and securing elements, the light affecting elements, and the first alignment features and the second section of the surface includes the second alignment features.

Abstract: An optical system with different optical coupling device configurations and a method of fabricating the same are disclosed. An optical system includes a substrate, a waveguide disposed on the substrate, an optical fiber optically coupled to the waveguide, and an optical coupling device disposed between the optical fiber and the waveguide. The optical coupling device configured to optically couple the optical fiber to the waveguide. The optical coupling device includes a dielectric layer disposed on the substrate, a semiconductor tapered structure disposed in a first horizontal plane within the dielectric layer, and a multi-tip dielectric structure disposed in a second horizontal plane within the dielectric layer. The first and second horizontal planes are different from each other.

Abstract: A planar lightwave circuit (PLC) assembly is used for a transceiver module that includes a circuit board having photodetectors mounted at a spacing from one another. A transmitter mounted on the circuit board is configured to transmit optical signals for a network. The PLC assembly includes at least one PLC chip and at least one fiber array. The PCL chip mounts on the transmitter and is configured to receive optical signals for the network. The fiber array has optical fibers connecting between the PLC chip and the photodetectors. The array's first end connected to the PLC chip has a first pitch between the optical fibers, while the array's second end has at least one connector connected adjacent the photodetectors and having a second fiber pitch, which is greater than the first pitch and is configured to the spacing of the photodetectors.

Abstract: An optical transducer for endoscope includes an optical element, an optical fiber, and a fiber holding member including a first holding member including a first principal surface and a second principal surface and a second holding member in which a third principal surface is disposed to face the second principal surface, a first through-hole into which the optical fiber is inserted, being formed in the first holding member, the optical element being mounted on a fourth principal surface. A trench connected to the first through-hole and including openings respectively on opposed two side surfaces is formed on the second principal surface. Only a part of a distal end portion of the optical fiber is observable from the openings of the trench.

Abstract: Mid-infrared-transparent optical fiber products with enhanced resistance to OH diffusion are disclosed, which may be used fiber laser oscillator and amplifiers systems. In one embodiment, an optical fiber product may include optical fiber configured for propagation of mid-infrared radiation toward a light-radiating endface of or coupled to the optical fiber, and a diffusion barrier disposed on the light-radiating endface and configured for allowing the mid-infrared radiation emanating from the light-radiating endface to pass therethrough and for preventing OH diffusion therethrough toward the light-radiating endface.

Abstract: Provided is an optical waveguide circuit in which the space between waveguides, a waveguide groove, or the space between fibers is filled with a resin where a wavelength shifts to positive (shifts backward) instead of a conventional resin where a wavelength shifts to negative (shifts forward), to return a refractive index having decreased by an instantaneous change to the original refractive index. In the filling resin with which the space between the waveguides, the waveguide groove, the space between the fibers, or the space between the fiber and the waveguide is filled, upon input of light, a refractive index of a portion through which the light passes instantaneously decreases, and then the refractive index gradually increases to compensate the initial decrease in the refractive index.

Abstract: A measurement apparatus, including: a tapered optical fiber, the tapered optical fiber having an input to receive radiation and having an output to provide spectrally broadened output radiation toward a measurement target, the tapered optical fiber configured to spectrally broaden the radiation received at the input; and a detector system configured to receive a redirected portion of the output radiation from the measurement target.

Abstract: Structures including an optical component and methods of fabricating a structure including an optical component. The structure includes a substrate, an optical component including a waveguide core, and a back-end-of-line stack including a heat spreader layer. The optical component is positioned in a vertical direction between the substrate and the back-end-of-line stack. The waveguide core contains a first material having a first thermal conductivity, and the heat spreader layer contains a second material having a second thermal conductivity that is greater than the first thermal conductivity of the first material.

Abstract: Optical interconnects for IC chips may include optical sources and receivers integrated with the IC chips. MicroLEDs may be mounted on an interconnect layer of the IC chip, and embedded within a waveguide. Photodetectors to receive light from the waveguide may be fabricated in a top surface of a semiconductor substrate, below a level of the interconnect layer, but with a passageway for light through the interconnect layer.

Abstract: A multiplexing optical system includes a light source, a lens and a lens array. The light source includes a plurality of light emitting elements of surface emitting lasers. The lens is configured to change and condense optical paths of laser light beams emitted from the light emitting elements. The lens array includes a plurality of lens regions arrayed so as to correspond to respective optical paths of the laser light beams changed by the lens, and is configured to condense the laser light beams by the lens regions to form a multiplexed beam.

Abstract: Roughly described, an optical device includes a first waveguide having a first core sheathed by a first cladding, and a second waveguide having a second core. A terminal portion of second core is disposed under a terminal portion of the first core and sheathed by the first core. The refractive index of the second core is higher than that of the first core, and the index of the first core, at least in the terminal portion of the first waveguide, is higher than that of the first cladding. The second core is structured under the terminal portion of the first core so that light traveling in the second core and directed toward the end of the second core is guided along the second core and coupled into the first core, and vice-versa.

Abstract: Techniques relating to an improved optical waveguide are described. The optical waveguide includes an upper and lower waveguide that each comprise a first and second layer, in which photons are transferred from the lower waveguide to the upper waveguide. A structured subwavelength coupling region is included, for example, in the first upper waveguide layer. The fill factor of the subwavelength grating coupling region is increased in the direction of light propagation to increase the index of refraction of the structured subwavelength coupling region and therefore improve photon transfer from the lower waveguide. Additionally, the width of the optical waveguide (at least along the structured subwavelength coupling region) remains constant as the fill factor increases.

Abstract: The present disclosure relates to a method including providing a die including a cavity therein, wherein the die further may include a die fiducial on a top surface. The method further includes placing a lens structure in the cavity of the die, wherein the lens structure may include a lens fiducial on a front surface. The method also includes moving the lens structure in the cavity to a position until a lens fiducial image may be captured in an image processing system when the lens fiducial and the die fiducial coincide and lie in a plane orthogonal to the top surface of the die. A corresponding system is also disclosed herein.

Abstract: Photonics structures for a waveguide or an edge coupler and methods of fabricating a photonics structure for a waveguide or an edge coupler. The photonics structure includes a waveguide core having a first section, a second section longitudinally adjacent to the first section, first segments projecting in a vertical direction from the first section, and second segments projecting in the vertical direction from the second section. The first section of the waveguide core has a first thickness, and the second section of the waveguide core has a second thickness that is greater than the first thickness.

Abstract: A fiber optic telecommunications tray is provided with features that improve accessibility and handling of fibers and/or cables in the tray. The tray may include a combination of a fiber storage device, a fiber splice device, and a fiber termination device, which are arranged in a particular order. Alternatively, the tray may include a plurality of fiber termination devices. Further, the tray may include a fiber funneling structure that make is easy to route and retain fibers in the tray.

Abstract: A diffractive optical waveguide is provided, which comprises a waveguide substrate and a coupling-in grating, a coupling-out grating, and a coupling-in end light-return grating formed on the substrate, the coupling-in grating couples an input beam into the waveguide substrate and forms a first beam of light propagating toward the coupling-out grating and a second beam of light not propagating toward the coupling-out grating, the coupling-out grating couples at least a part of the light propagating therein out of the substrate, and the coupling-in end light-return grating diffracts the second beam of light so that it propagates toward the coupling-out grating. A display device having the above diffractive optical waveguide is also disclosed. By providing the coupling-in end light-return grating, optical coupling efficiency of the diffractive optical waveguide is improved, and the energy distribution uniformity of an output field of the diffractive optical waveguide is improved.

Abstract: According to an aspect of the present disclosure, an edge coupler for a photonic chip is provided. The edge coupler includes a substrate having a top surface, a sealed cavity in the substrate, a waveguide core, and a back-end-of-line stack. The sealed cavity has varying depths relative to the top surface of the substrate. The waveguide core is over the sealed cavity. The back-end-of-line stack includes a side edge, an interlayer dielectric layer, and an assisting waveguide. The assisting waveguide is on the interlayer dielectric layer adjacent to the side edge. The assisting waveguide and the waveguide core have an overlapping arrangement with the sealed cavity in the substrate.

Abstract: A display system comprises a waveguide having light incoupling or light outcoupling optical elements formed of a metasurface. The metasurface is a multilevel (e.g., bi-level) structure having a first level defined by spaced apart protrusions formed of a first optically transmissive material and a second optically transmissive material between the protrusions. The metasurface also includes a second level formed by the second optically transmissive material. The protrusions on the first level may be patterned by nanoimprinting the first optically transmissive material, and the second optically transmissive material may be deposited over and between the patterned protrusions. The widths of the protrusions and the spacing between the protrusions may be selected to diffract light, and a pitch of the protrusions may be 10-600 nm.