Abstract: A semiconductor optical integrated device includes: a substrate; at least a lower cladding layer, a waveguide core layer, and an upper cladding layer sequentially layered on the substrate, a buried hetero structure waveguide portions each having a waveguide structure in which a semiconductor cladding material is embedded near each of both sides of the waveguide core layer; and a ridge waveguide portion having a waveguide structure in which a semiconductor layer including at least the upper cladding layer protrudes in a mesa shape. Further, a thickness of the upper cladding layer in each of the buried hetero structure waveguide portions is greater than a thickness of the upper cladding layer in the ridge waveguide portion.

Abstract: A SOI bent taper structure is used as a mode convertor. By tuning the widths of the bent taper and the bend angles, almost lossless mode conversion is realized between TE0 and TE1 in a silicon waveguide. The simulated loss is <0.05 dB across C-band. This bent taper can be combined with bi-layer TM0-TE1 rotator to reach very high efficient TM0-TE0 polarization rotator. An ultra-compact (9 ?m) bi-layer TM0-TE1 taper based on particle swarm optimization is demonstrated. The entire TM0-TE0 rotator has a loss <0.25 dB and polarization extinction ratio >25 dB, worst-case across the C-band.

Abstract: Cables jacket are formed by extruding discontinuities in a main cable jacket portion. The discontinuities allow the jacket to be torn to provide access to the cable core. The armor cables have an armor layer with armor access features arranged to work in combination with the discontinuities in the cable jacket to facilitate access to the cable core.

Abstract: Compact photonics platforms and methods of forming the same are provided. An example of a compact photonics platform includes a layered structure having an active region along a longitudinal axis, a facet having an angle no less than a critical angle formed at at least one longitudinal end of the active region, and a waveguide having at least one grating coupler positioned in alignment with the angled facet to couple light out to or in from the waveguide.

Abstract: According to various implementations of the invention, a system for controlling a controlled device includes a lidar configured to direct at least one beam toward a target; a first controlled device, wherein the at least one beam is directed toward the target via the first controlled device; and a control system configured to control a position of the first controlled device, where the control system includes an open loop controller and a closed loop controller. The open loop controller is configured to receive a desired trajectory command signal, and generate an open loop drive signal based on the desired trajectory command signal. The closed loop controller is configured to receive an actual position signal of the first controlled device, and generate a closed loop drive signal based on the actual position signal and a control signal derived from the command signal, where the control signal accounts for group delays associated with one or more control system components.

Abstract: A multimode optical fiber includes a core region in having silica and an outer radius, R. A cladding of the fiber surrounds the core region and includes silica. The core region has a refractive index profile with a radially-dependent alpha. The radially-dependent alpha is given by ?(r)=f(r).

Abstract: The present invention generally relates to optical circuits for mitigating power loss in medical imaging systems and methods for using such circuits. Circuits of the invention can involve a first optical path, a second optical path, and a means for recombining an optical signal transmitted through the first and second optical paths by sequentially gating the first and second optical paths to a single output.

Abstract: An optical system for transmitting a source image is provided. Light having a field angle spectrum emanates from the source image. The optical system includes an optical waveguide arrangement, in which light can propagate by total internal reflection. The optical system also includes a diffractive optical input coupling arrangement for coupling the light emanating from the source image into the optical waveguide arrangement. The optical system further includes a diffractive optical output coupling arrangement for coupling the light that has propagated in the optical waveguide arrangement out from the optical waveguide arrangement. The disclosure also provides related methods.

Abstract: An optical waveguide that performs both in-coupling and out-coupling using two diffractive optical elements is provided. Each optical element is a diffraction grating and can be applied to the same or different surface of the optical waveguide. The diffraction gratings overlap to form two overlapping regions. The first overlapping region in-couples light into the waveguide and the second overlapping region out-couples light from the optical waveguide. Because the optical waveguide only uses two gratings, and therefore only has two grating vectors, the optical waveguide is easier to manufacture than optical waveguides with a greater number of grating vectors.

Abstract: An assembly comprises an optic cable comprising a plurality of optic fiber subunits each comprising at least one optic fiber encased in a fiber jacket and a plurality of aramid strands is disclosed. The assembly further comprises one or more blocks comprising a passage ways for receiving the optic fiber subunits and maintaining adjacent ones of the optic fiber subunits at a predetermined spacing. A housing is molded over the open end of the cable jacket, the aramid strands and the first end of the at least one block. A method of overmolding a transition between an optic fiber cable and a furcation jacketing is also disclosed wherein a mold comprises ribs arranged at right angles to an axis of the mold and such that aramid strands are prevented during injecting from reaching a surface of the mold.

Abstract: A micro-optic module couples a pair of substrates to opposing sides of a fast-axis collimating lens and a beam twister. The arrangement of optical elements is oriented substantially parallel to a neutral plane defined by propagation paths of the light from each emitter of an array of laser emitters. The pair of substrates may have substantially the same coefficient of thermal expansion and coefficient of thermal conductivity, and the micro-optic module may be configured to exhibit symmetry of thermal loading about the neutral plane when the array of laser emitters emits light at an operational power level. The micro-optic module may be coupled with an array of laser emitters, for example a laser diode bar. The module exhibits thermal properties that facilitate a consistently focused light beam with minimal positional drift, which may enable efficient and reliable coupling of the light beam to optical fibers and other high-tolerance applications.

Abstract: A wafer-level technique to couple an optical fiber to an integrated photonic circuit is presented. A connector is fabricated on top of a substrate. The connector comprises hollow structures with high aspect ratio. The connector receives an optical fiber or a ribbon of optical fibers for connection to the integrated photonic circuit. The connector is made with a certain angle to achieve optimal coupling. The base of connector is aligned to a coupler on the substrate. Light can propagate in both directions from the fiber to the chip or from the chip to the fiber.

Abstract: A composite optical waveguide is constructed using an array of waveguide cores, in which one core is tapered to a larger dimension, so that all the cores are used as a composite input port, and the one larger core is used as an output port. In addition, transverse couplers can be fabricated in a similar fashion. The waveguide cores are preferably made of SiN. In some cases, a layer of SiN which is provided as an etch stop is used as at least one of the waveguide cores. The waveguide cores can be spaced away from a semiconductor layer so as to minimize loses.

Abstract: An optical axis adjustment method for optical interconnection, includes: providing, on a substrate, an optical transmitter including light sources and a mark for acquiring a position of each of the light sources; providing, on the substrate, an optical waveguide including cores each allowing light emitted from the respective light sources to propagate through the core; determining a first position based on the mark as a position of each of the light sources; and forming, at a second position in the optical waveguide corresponding to the first position, first mirrors configured to reflect the light emitted from the respective light sources and make the light propagate through the respective cores.

Abstract: Methods and systems for writing a Bragg grating along a grating region of an optical fiber through a polymer coating of the optical fiber are provided. A light beam of ultrafast optical pulses is impinged on the grating region, the ultrafast optical pulses being characterized by writing wavelength at the grating region to which the polymer coating is substantially transparent The light beam is diffracted through a phase mask so as to form an interference pattern defining the Bragg grating at the grating region of the optical fiber. The light beam is also focussed such that the intensity of the optical pulses is below a damage threshold within the polymer coating, and above an FBG inscription threshold within the grating region of the fiber. Optical fiber having Bragg gratings and improved mechanical are also provided.

Abstract: The invention relates to a planar-optical element having at least one photonic component, which is arranged in at least one substrate containing or consisting of at least one polymer, wherein the substrate includes at least one first film layer having a first side and an opposite second side and a second film layer having a first side and an opposite second side, wherein the first side of the second film layer is arranged on the second side of the first film layer and at least the second film layer contains nanowires, at least in a subarea. The invention also relates to a corresponding sensor element and a method for the production thereof.

Abstract: A v-groove assembly is used to edge couple a lensed fiber (e.g., an optical fiber made of silica) with a waveguide in a photonic chip. The v-groove assembly is made from fused silica. Fused silica is used to so that an adhesive (e.g., epoxy resin) used in bonding the lensed fiber to the v-groove assembly and/or bonding the v-groove assembly to the photonic chip can be cured, at least partially, by light.

Abstract: An integrated optical device fabricated in the back end of line process located within the vertical span of the metal stack and having one or more advantages over a corresponding integrated optical device fabricated in the silicon on insulator layer.

Abstract: An optical waveguide, for use a near-eye or heads-up display system, includes an input-coupler, an intermediate-component and an output-coupler. The input-coupler is configured to couple light corresponding to an image that is incident on the input-coupler, into the optical waveguide and towards the intermediate-component. The intermediate-component can be implemented as a Bragg polarization grating that comprises a stack of birefringent layers configured to diffract the light corresponding to the image that is incident thereon into a zero-order beam having one of right handed circular polarization or left handed circular polarization, and a first-order beam having the other one of right handed circular polarization or left handed circular polarization.

Abstract: An optical fiber holding structure includes: a structure main body having a prismatic shape; a through hole into which an optical fiber is inserted; a protruding portion having a columnar shape projecting from the structure main body and configured to be inserted into an opening portion of a substrate; and a contact portion configured to abut on a surface of the substrate to position an optical element and the optical fiber at a predetermined distance. The through hole is formed so as to penetrate from a surface of the structure main body through which the optical fiber is inserted to an end surface of the protruding portion, and at least one side surface of the structure main body is flush with at least one side surface of the protruding portion.