Abstract: A higher-order mode (HOM) fiber is configured as a polarization-maintaining fiber by including a pair of stress rods at a location within the cladding layer that provides for a sufficient degree of birefringence without unduly comprising the spatial mode profile of the propagating higher-order modes. An optical imaging system utilizing polarization-maintaining HOM fiber allows for different wavelength probe signals to be directed into different modes, useful in applications such as STED microscopy, 2D sensing, and the like.

Abstract: The present disclosure provides an optical fiber cable. The optical fiber cable includes a plurality of optical fibers lying substantially along a longitudinal axis of the optical fiber cable. Further, the optical fiber cable includes a first layer surrounding the plurality of optical fibers. Furthermore, the optical fiber cable includes a second layer surrounding the first layer. Furthermore, the optical fiber cable includes a third layer surrounding the second layer. Moreover, the optical fiber cable includes a fourth layer surrounding the third layer. The first layer is a water blocking tape. The second layer is a buffer tube layer made of polyethylene material and foamed with master batch. The third layer is a water blocking tape. The fourth layer is a sheath made of polyethylene material. Moreover, the fourth layer has a plurality of strength members embedded inside the fourth layer.

Abstract: An optical waveguide element includes: a cladding portion made of silica-based glass; and a plurality of optical waveguides positioned in the cladding portion and made of silica-based glass in which ZrO2 crystal particles are dispersed. The optical waveguide element is a planar lightwave circuit. The plurality of optical waveguides configure an arrayed waveguide grating element.

Abstract: An optical fiber sensor extends coaxially with a controllable heater to provide high-resolution axial measurement of thermal properties such as thermal convection of the surrounding, Heat removal by either conduction or convection may be used to deduce material height in a tank, or velocity of flow when coupled with localized heating, or other aspects of the material based on thermal conductivity.

Abstract: Beam combining optical systems include a fiber beam combiner having multiple inputs to which output fibers of laser diode sources are spliced. Cladding light stripping regions are situated at the splices, and include exposed portions of fiber claddings that are at least partially encapsulated with an optical adhesive or a polymer. A beam combiner fiber that is optically downstream of a laser source has an exposed cladding secured to a thermally conductive support with a polymer or other material that is index matched to the exposed cladding. This construction permits attenuation of cladding light propagating toward a beam combiner from a splice.

Abstract: Two optical waveguides and an insulating film provided to cover the optical waveguides are formed over an insulating layer. Two wirings and a heater metal wire are formed over the insulating film via an insulating film different from the above insulating film. The latter insulating film is thinner than the former insulating film, and has a higher refractive index than the former insulating film. The leaked light from either of the two optical waveguides can be suppressed or prevented from being reflected by any one of the two wirings, the heater metal wire, and the like to travel again toward the two optical waveguides by utilizing the difference between the refractive indices of the two insulating films.

Abstract: A single mode optical fiber, comprising: (i) a silica based core having a step refractive index profile with an alpha of greater than 10, a relative refractive index ?1MAX, and an outer radius r1, wherein 6.25 microns>r1?4.75 microns, the core further comprising Cl, Ge, or a combination thereof; (ii) a first cladding region in contact with and surrounding the core, the first cladding region having a relative refractive index ?2MIN, an inner radius r1, and an outer radius r2, wherein r2<20 microns; and (iii) an outer cladding region surrounding the first cladding region, the outer cladding region having a relative refractive index ?3. The fiber<1300 nm, a 22m cable cutoff wavelength<1260 nm; and a bend loss<0.005 dB/turn when the optical fiber is bent around a 30 mm mandrel; <0.5 dB/turn when the fiber is bent around a 20 mm mandrel.

Abstract: Planar waveguide junctions are described with a waggled transition section connecting input waveguide sections with output waveguides sections, in which the waggled transitions have alternating segments matching the input waveguide and output waveguides to efficiently transition the optical signal. The planar waveguide junctions can be used to form efficient optical splitters, mixers, or taps.

Abstract: The methods of singulating an optical waveguide sheet that supports sheet optical waveguides include irradiating the optical waveguide sheet with a focused laser beam comprising ultrafast light pulses to form within the body of the optical waveguide sheet modified regions, which along with unmodified regions, that define a singulation line. The modified regions define modified sections that are spaced apart by the unmodified sections, which reside at locations of the sheet optical waveguides. The optical waveguide sheet is separated along the singulation line to form an optical waveguide substrate with substrate waveguides formed by sections of the sheet optical waveguides. The optical waveguide substrate has an end face with both smooth and rough sections. The substrate waveguides have end surfaces that terminate at the smooth sections, thereby enabling low-loss optical coupling to other optical components.

Abstract: Disclosed is a fiber cable terminal which comprises a cable assembly, a cable fixing portion and a thermal shrinkable tube. The cable assembly includes: an inner sheath through 5 which the fiber can pass; and a protection layer provided outside of the inner sheath. The cable fixing portion includes: an insertion portion to be inserted between the protection layer and the inner sheath; and a fixing portion connected with the insertion portion and positioned outside of the protection layer. The thermal shrinkable tube wraps a part of the fixing portion and a part of the protection layer and fixes the cable fixing portion and the 10 cable assembly together. All the members of the fiber cable terminal are pre-assembled into a sealed one-piece, the sealing performance between the cable fixing portion and the protecting layer is thus improved. The fiber cable terminal is mated with the through hole of the supporting body to improve the sealing performance between the fiber cable terminal and the supporting body.

Abstract: A display subsystem for a virtual image generation system for use by an end user comprises a planar waveguide apparatus, an optical fiber, at least one light source configured for emitting light from a distal end of the optical fiber, and a collimation element mounted to a distal end of the optical fiber for collimating light from the optical fiber. The virtual image generation system further comprises a mechanical drive assembly to which the optical fiber is mounted to the drive assembly. The mechanical drive assembly is configured for displacing the distal end of the optical fiber, along with the collimation element, in accordance with a scan pattern. The virtual image generation system further comprises an optical waveguide input apparatus configured for directing the collimated light from the collimation element down the planar waveguide apparatus, such that the planar waveguide apparatus displays image frames to the end user.

Abstract: An inkjet head including a flow path unit and a plurality of actuator units, each of the plurality of actuator units has a parallelogram shape defined by two sets of opposing sides, which is substantially parallel to a first direction and a second direction intersecting with each other along a plane, the side of the actuator unit parallel to the second direction is substantially parallel to that of an adjacent actuator unit and is shifted from that of the adjacent actuator unit in the second direction, the plurality of actuator units are inclined with respect to two contour lines of a flow path unit, the two contour lines being parallel with each other and extending in a longitudinal direction of the flow path unit, and centers of gravity of contours of the plurality of actuator units are arranged on substantially one straight line which is parallel to the contour lines.

Abstract: Aspects of the invention are directed to an electro-optical device having a layer structure including a substrate, an electrically insulating layer on top of the substrate, a bonding layer on top of the electrically insulating layer, a Pockels layer on top of the bonding layer, a waveguide core on top of the Pockels layer, and a cladding layer cladding both the waveguide core and the Pockels layer, the latter coated by the cladding layer. The Pockels layer is a layer of a crystalline first material having a Pockels coefficient between 10 pm/V and 10 000 pm/V. The waveguide core includes a second material, which can be crystalline. The device can be adapted to optically couple radiation into and/or from the waveguide core. Each of the first material and the second material has a larger refractive index than the electrically insulating layer and the cladding layer for said radiation.

Abstract: A waveguide coupler includes a first waveguide and a second waveguide. The waveguide coupler also includes a connecting waveguide disposed between the first waveguide and the second waveguide. The connecting waveguide includes a first material having a first index of refraction and a second material having a second index of refraction higher than the first index of refraction.

Abstract: Radial emission optical fiber terminations that include conical elements can prevent axial emission and redirect all incident light to radial positions. One termination includes an optical fiber having an up-tapered terminus, the up-tapered terminus having a maximum taper diameter of at least 1.5 times the core diameter and ending at a cone-tip which has an apex angle in a range of about 70° to about 100°. Another termination includes a fiber cap that is a unitary construction of a glass tube and an optical element that bisects the glass tube. The glass tube includes an open end adapted to receive an optical fiber and a closed end. The optical element, consisting of fused quartz or fused silica, has an input face proximal to the open end of the glass tube and a conical face proximal to the closed end of the glass tube.

Abstract: In general, a TOSA consistent with the present disclosure includes a light driving circuit coupled to a hermetically-sealed light engine. The hermetically-sealed light engine includes a housing defined by a plurality of sidewalls. The housing defines a cavity that is hermetically-sealed to prevent introduction of contaminants that would otherwise reduce optical power. The hermetically-sealed light engine optically couples to an external arrayed waveguide grating (AWG), or other multiplexing device, by way of an optical receptacle. The optical receptacle can include a waveguide implemented external to the hermetically-sealed cavity and can include, for instance, an optical isolator, fiber stub, and fiber ferrule section. Thus, the external AWG and associated external optical coupling components advantageously allow for the hermetically-sealed light engine to have a cavity with dimensions relatively smaller than other approaches that dispose an AWG and associated components within a hermetically-sealed cavity.

Abstract: An optical device that can be used as an optical hybrid, e.g., in CMOS-compatible PICs. In an example embodiment, the optical device has a single optical input and four optical outputs. The two optical input signals to be mixed in the optical device are applied to the single optical input as transverse electric (TE) and transverse magnetic (TM) polarization components, respectively, of the corresponding polarization-multiplexed optical input signal. In response to the latter, the optical device causes the four outputs to receive four different relative-phase combinations of the two optical input signals, each combination being coupled into a TE waveguide mode at the respective optical output. A PIC having one or more instances of the optical device can be used, e.g., to implement a coherent optical receiver, wherein the TE and TM polarization components of the optical input signal are populated by a communication signal and a local-oscillator signal.

Abstract: An enclosable box for housing components from more than one telecommunications systems including a first housing portion, a second housing portion, a box mounting hinge that connects the first housing portion and the second housing portion, an internal telecommunications component compartment panel, a compartment panel mounting hinge that connects the internal telecommunications component compartment with one of the first and second housing portions. The compartment panel mounting hinge may be configured to allow the compartment panel to open and close an internal compartment or cavity that is large enough to enclose at least a first telecommunications systems component. The back wall of the first housing portion may include a component platform that is either fixed or allowed to pivot into a configuration such that the component platform is tilted away from the base member.

Abstract: A fiber coupling device (100) includes the following components: a wedge plate (102) for receiving light and refracting the light in a predetermined direction, a condenser lens (104) for collecting the light refracted by the wedge plate (102); and an optical fiber (107) having an incident surface for receiving the light collected by the condenser lens (104). The wedge plate (102) is held rotatable around the optical axis (200) of the light incident on the wedge plate (102). The light refracted by the wedge plate (102) and collected by the condenser lens (104) is incident on a different point on the incident surface depending on the rotation angle of the wedge plate (102).

Abstract: A display subsystem for a virtual image generation system comprises a planar waveguide apparatus, an optical fiber, at least one light source configured for emitting light from a distal end of the optical fiber, and a mechanical drive assembly to which the optical fiber is mounted as a fixed-free flexible cantilever. The drive assembly is configured for displacing a distal end of the optical fiber about a fulcrum in accordance with a scan pattern, such that the emitted light diverges from a longitudinal axis coincident with the fulcrum. The display subsystem further comprises an optical modulation apparatus configured for converging the light from the optical fiber towards the longitudinal axis, and an optical waveguide input apparatus configured for directing the light from the optical modulation apparatus down the planar waveguide apparatus, such that the planar waveguide apparatus displays one or more image frames to an end user.