Abstract: Systems and methods are providing for endoscopically visualizing tissue within a patient. In one aspect, an endoscope comprises an elongate shaft having a distal end and a proximal end and a visualization section at the distal end of the shaft. The visualization section includes a proximal surface and an outer surface spaced apart from the proximal surface. At least one of the proximal surface or the outer surface of the visualization section has an average surface roughness less than about 50 nanometers RMS. The endoscope allows improved remote visualization while not interfering with the autofocus feature of a video capture system and not causing increased light reflectance and glare due to improved surface finish.

Abstract: Optical coupler structures include a waveguide having waveguide metamaterial segments aligned along a first line. A second insulator is on the first insulator and the waveguide metamaterial segments. A coupler structure is in the second insulator and has coupler metamaterial segments aligned along a second line. The first line and the second line are parallel and within a plane. A portion of the waveguide overlaps a portion of the coupler structure. The waveguide metamaterial segments intersect the plane and have first widths perpendicular to the plane, and the first widths have a first taper along the first line. The coupler metamaterial segments intersect the plane and have second widths in the direction perpendicular to the plane. The second widths have a second taper along the second line that is different from the first taper of the first widths where the waveguide overlaps the coupler structure.

Abstract: An external indicator assembly for a central processing unit (CPU) disposed within an equipment cabinet, including: an internal fitting adapted to be disposed adjacent to indicator lights associated with the CPU; an external fitting adapted to be coupled to or disposed through an external surface of the equipment cabinet; and one or more optical fibers adapted to be coupled between the internal fitting and the external fitting such that light from the indicator lights is transmitted from the CPU disposed within the equipment cabinet external to the equipment cabinet such that the light is visible to a person external to the equipment cabinet. This allows the person to visually assess the status or power-down cycling of the CPU during a shutdown or restart process without or before opening the equipment cabinet, thereby preventing corruption of the CPU and assuring personal safety by avoiding contact with powered components.

Abstract: The present disclosure relates to an interconnect system for interfacing an electronic subsystem to a qubit package, wherein the qubit package has a plurality of independent qubits. The system makes use of an optical fiber cable having a plurality of optical fibers, which is interfaced to the electronic subsystem. A 3D optical structure is used which has a plurality of internal waveguides, and which is configured to interface the optical fiber cable to the qubit package. The 3D optical structure further has at least one subsystem for using the plurality of waveguides to receive signals of a first type from at least one of the qubits package or the optical fiber cable, to convert the signals from the first type to a second type, and to transmit the signals in the second type to the other one of the fiber optic cable or the qubit package.

Abstract: An optical assembly for optical aperture expansion combines facet reflective technology with diffractive technology. At least two diffractive components having opposite optical power (matching) are used, so that chromatic dispersion introduced by the first diffractive component will then be cancelled by the second diffractive component. The two diffractive components are used in combination with a reflective optical component to achieve more efficient aperture expansion (for near eye display), reducing distortions and noise, while also reducing design constraints on the system and individual components, as compared to conventional techniques. The assembly eliminates and/or reduces the need for polarization management, while enabling wider field of view. In addition, embodiments can have reduced nonuniformity, as compared to conventional single technology implementations, since the distortion patterns of the two technologies do not correlate.

Abstract: An optical circuit element formed on a substrate, the optical circuit element includes a first waveguide and a second waveguide, the second waveguide having a shape in a width direction, the shape being asymmetrical to the first waveguide. The first waveguide includes a first segment and a second segment, the first segment having a width that changes along a light propagation direction, the second segment continuous with the first segment. The second waveguide includes a coupled waveguide adjacent to the second segment of the first waveguide. At least one of the second segment and the coupled waveguide has a shape with a width that changes along the light propagation direction.

Abstract: A cable assembly including a tracer conduit and one or more data transmission conduits. Physically separable proximal and/or distal portions of the data transmission conduit(s) and the tracer conduit are held together by a sleeve. In some examples the sleeve is axially and radially expandable and collapsible multiple times. In some examples, the tracer conduit transmits a visible laser light signal that can be observed after it radially diffuses through the sleeve.

Abstract: A fiber optic connector housing has a first portion to receive fiber optic ferrule holders and fiber optic ferrules. The fiber optic connector housing also includes a second portion for use during polishing and before one of the fiber optic ferrule holders is rotated 180°. The second portion is removed to allow for rotation and a third portion is attached to the first portion for connection with another fiber optic connector or assembly.

Abstract: A system comprising a waveguide including an in-coupler and an out-coupler, and a digital micromirror device (DMD) to receive the light from the waveguide via the out-coupler, and to direct modulated light through the waveguide, the modulated light passing through the waveguide before being directed toward a user's eye.

Abstract: An encapsulated tubular cable with a colorized identification strap includes armored protection ducts and an encapsulation protection layer. A hollow passage is formed in the center of the duct body after each armored protection duct is formed. A wire cable, an optical fiber, or an oil duct is placed in the hollow passage. The encapsulation protection layer wraps the armored protection ducts. A plurality of armored protection ducts are arranged in one encapsulated protection layer. A peripheral edge of each armored protection duct is correspondingly provided with at least one colorized identification strap group.

Abstract: A mounted hollow-core fiber arrangement includes a hollow-core fiber having a microstructure, and a mount arrangement including a plurality of mounting contacts configured to apply a force to an outer layer of the hollow-core fiber. A portion of the hollow-core fiber is located in a receiving region of the mount arrangement. The plurality of mounting contacts are positioned around the receiving region. The mounting contacts are distributed around the receiving region, the distribution of the mounting contacts corresponding to a distribution of features of the microstructure of the hollow-core fiber. The mounted hollow core fiber can be used in a radiation source apparatus for providing broadband radiation.

Abstract: Structures for a wavelength division multiplexing filter and methods of fabricating a structure for a wavelength division multiplexing filter. The structure includes a first waveguide core having a first section and a second section. The first section and the second section have a first notched sidewall and a second notched sidewall opposite to the first notched sidewall. The structure further includes a second waveguide core positioned with a first offset in a first direction relative to the first section and the second section of the first waveguide core and with a second offset in a second direction relative to the first section and the second section of the first waveguide core. The second direction is transverse to the first direction.

Abstract: A system for passive alignment of fibers to an interface of a photonic integrated circuit (PIC) includes an input frame, an actuator, and an output frame. The actuator arranged to apply force along a force axis to the input frame. The output frame including a tip for picking up a plate and transferring the force thereto, the output frame being connected to the input frame such that the output frame may tilt relative to the input frame and the output frame is elastically biased relative to the input frame into a position wherein the tip is aligned on the force axis.

Abstract: A pin exchanger has protrusions from gripping elements that engage fiber optic guide pins. Guide beams on the pin exchanger provide a reference for aligning the guide pins and the pin exchanger with a fiber optic connector and a fiber optic ferrule. An adapter is also provided that has openings to receive the guide beams. The adapter is preferably installed in a field tool and together they engage the fiber optic connector, align the pin exchanger and move the guide pin holder to allow guide pins to be inserted or removed.

Abstract: Optical modulators with semiconductor based optical waveguides interacting with an RF waveguide in a traveling wave structure. The semiconductor optical waveguide generally comprise a p-n junction along the waveguide. To reduce the phase walk-off between the optical signal and the RF signal, the traveling wave structure can comprise one or more compensation sections where the phase walk-off is reversed. The compensation sections can comprise a change in dopant concentrations, extra length for the optical waveguide and/or extra length for the RF waveguide. Corresponding methods are described.

Abstract: Optical fiber filters and uses thereof are presented. In typical implementations, there is provided a FBG taking deleterious light out of a fiber core without reflecting it into the fiber core. It also allows the unhindered transmission of useful light at a wavelength outside of the spectral band covered by the deleterious light. The filter couples the incoming deleterious light to cladding modes propagating in the opposite direction without coupling the incoming useful light to core or cladding modes propagating in the opposite direction. The filter may for example be useful as a Raman or ASE filter in a laser cavity of other optical devices.

Abstract: A rotatable connector for rotatable mounting an optical fiber, comprising a hollow shaft for introducing and fixing an optical fiber mechanically to the hollow shaft, furthermore comprising one or more bearings, whereby, in the case of a two bearing construction, the interior of a first bearing is fixed onto the hollow shaft, as well as the interior of a second bearing being fixed onto the hollow shaft, whereby the second bearing is spaced apart from the first bearing, the exterior of at least one bearing is in contact with the interior of a hollow stationary part, the latter having a thread, which can be screwed together with the counter thread of a cap or cap nut, which may apply an axial clamping force onto the bearings, when tightened.

Abstract: Sensors for imaging boreholes via the detection of electrical and optical properties may be subject to harsh conditions downhole, such as from pressure and temperature. In addition, these sensors may be subject to impact, such as tension, elongation, and compression forces, along the wall of the borehole. The harsh conditions downhole and impacts on the sensor can lead to premature wear and even breaking. The present disclosure generally relates to an apparatus for measuring electrical and optical properties of the borehole and methods for manufacturing the apparatus.

Abstract: A cable management device for mounting to a telecommunications fixture includes an outer barrel disposed over an inner barrel, one of the outer barrel and the inner barrel defining a plurality of discrete detents positioned in a stacked arrangement axially along an length thereof, and the other of the outer barrel and the inner barrel defining at least one flexible cantilever arm defining a tab configured to lock into a selected one of the detents for allowing adjustment of a length of the cable management device.

Abstract: A fiber-to-fiber system for multi-layer ferroelectric on insulator waveguide devices is described. The system comprises a fiber-to-chip coupler that couples light from a standard optical fiber to multi-layer ferroelectric on insulator waveguides. The multi-layer ferroelectric on insulator waveguides are integrated with electrodes to implement an optical device, an electro-optical device, or a non-linear optical device, such as an electro-optical modulator, with microwave and optical waveguide crossings compatible with packaging. A second fiber-to-chip coupler outputs the light from the multi-layer ferroelectric on insulator device to a standard optical fiber.