Abstract: A tunable laser for a transceiver includes a silicon photonics substrate, first and second patterned regions each being defined in the substrate a step lower than a flat surface region of the substrate, first and second laser diode chips arranged in the first and second patterned regions, the patterned regions being configured to align the gain regions of the first and second laser diode chips with integrated couplers formed in the substrate adjacent to the first and second patterned regions to facilitate flip-bonding the first and second laser diode chips within the patterned regions, and a tuning filter coupled to the first laser diode chip and the second laser diode chip via the integrated couplers. The tuning filter is configured to receive laser light from each of the first and second laser diode chips and generate a laser output having a gain determined by each of the gain regions.

Abstract: A silicon photonics integration circuit includes a silicon substrate member; a RX sub-circuit formed in the silicon substrate member including multiple RX-input ports each having a mode size converter configured to receive an incoming light signal into one of multiple waveguides and multiple RX photo detectors coupled respectively to the multiple waveguides; and a TX sub-circuit formed in the silicon substrate member including one or more TX-input ports each having a mode size converter coupled to a first TX photo detector into one input waveguide, one or more 1×2 directional couplers each coupled between the input waveguide and two mod-input waveguides, multiple modulators coupled between respective multiple mod-input waveguides and multiple mod-output waveguides each being coupled to a second TX photo detector into one of multiple output waveguides, and multiple TX-output ports each having a mode size converter coupled to respective one of the multiple output waveguides.

Abstract: A pattern drawing device is provided with: a first cylindrical lens on which a beam from a light source device is incident and which has an anisotropic refractive power for converging, in a sub-scanning direction orthogonal to a main scanning direction, the beam traveling toward a reflection surface of a polygon mirror; an f? lens system for causing the beam having been deflected by the reflection surface of the polygon mirror to be incident thereon, and for condensing the beam as a spot light on a surface of an object to be irradiated; and a second cylindrical lens having an anisotropic refractive power for converging, in the sub-scanning direction, the beam traveling toward the surface after being emitted from the f? lens system.

Abstract: A method for forming a silicon optical modulator with improved modulation efficiency. the method includes providing a silicon layer in a SOI substrate and forming a waveguide in the silicon layer with a rib structure respectively joining with a first slab region on one side and a second slab region on opposite side with corresponding slab thicknesses smaller than the rib structure. The method additionally includes forming multiple etched sections in each of the first slab region and the second slab regions with decreasing etching depths for sections further away from the rib structure. Furthermore, the method includes forming a PN junction in the rib structure with a moderate P/N doping level. Moreover, the method includes doping the multiple etched sections in the first/second slab region respectively with P-type/N-type impurity at increasing doping levels sequentially for sections further away from the rib structure.

Abstract: A silicon optical modulator with improved bandwidth includes a silicon waveguide with a rib structure in cross section connected to a first slab region and a second slab region respectively on two opposite sides of the rib structure. The silicon optical modulator further includes a PN junction formed in the rib structure with a P-type part joined with the first slab region and a N-type part joined with the second slab region. Additionally, the silicon optical modulator includes multiple P-type doped sections formed one next to another in the first slab region ended with a first end region and multiple N-type doped sections one next to another formed in the second slab region ended with a second end region. The multiple P-type or N-type doped sections are configured with increasing doping levels for sections further away from the rib structure.

Abstract: A tunable laser device based on silicon photonics includes a substrate configured with a patterned region comprising one or more vertical stoppers, an edge stopper facing a first direction, a first alignment feature structure formed in the patterned region along the first direction, and a bond pad disposed between the vertical stoppers. Additionally, the tunable laser includes an integrated coupler built in the substrate located at the edge stopper and a laser diode chip including a gain region covered by a P-type electrode and a second alignment feature structure formed beyond the P-type electrode. The laser diode chip is flipped to rest against the one or more vertical stoppers with the P-type electrode attached to the bond pad and the gain region coupled to the integrated coupler. Moreover, the tunable laser includes a tuning filter fabricated in the substrate and coupled via a wire waveguide to the integrated coupler.

Abstract: In each of battery modules, a processing circuit manages a battery unit connected to a power line. A communication circuit communicates data to be transmitted or received by the processing circuit. An isolated circuit insulates in a direct current between a first terminal of the communication circuit and a positive-electrode terminal or a negative-electrode terminal of the battery unit, and between a second terminal of the communication circuit and a conductive body to be a common potential of a plurality of the battery modules except for the power line.

Abstract: A method for making a pair of photodiodes to detect low-power optical signal includes providing a waveguide including one or more branches in a silicon photonics substrate to deliver an input optical signal to the silicon photonics integrated circuit; forming a pair of nearly redundant photodiodes in silicon photonics platform in the silicon photonics substrate. coupling a first one of the pair of nearly redundant photodiodes optically to each of the one or more branches for receiving the input optical signal combined from all of the one or more branches; coupling a second one of the pair of nearly redundant photodiodes electrically in series to the first one of the pair of nearly redundant photodiodes; and drawing a current from the first one of the pair of nearly redundant photodiodes under a reversed bias voltage applied to the pair of nearly redundant photodiodes.

Abstract: A negative electrode that enables resistance of a battery to be lowered is provided. The negative electrode disclosed herein includes a negative electrode current collector and a negative electrode mixture supported by the negative electrode current collector. The negative electrode mixture contains a negative electrode active material. The negative electrode current collector is made of copper or a copper alloy. A surface of the negative electrode current collector is coated by chromium. A coating amount A of chromium with respect to the negative electrode current collector is 5 ?g/dm2 or more and 60 ?g/dm2 or less. Blackness B of the negative electrode mixture is 3 or higher and 30 or lower. The coating amount A and the blackness B satisfy 60?A×B?900. The blackness B is a value obtained according to the disclosed method.

Abstract: A germanium-on-silicon avalanche photodetector includes a silicon device layer of a silicon-on-insulator substrate having a central region characterized by modest-heavy n+ doping state between a first electrode region and a second electrode region in heavy n++ doping state; a first sub-layer of the central region modified to nearly neutral doping state and located from a first depth down to a second depth below a top surface of the silicon device layer; a second sub-layer of the central region modified to modest p doping state embedded from the top surface down to the first depth to interface with the first sub-layer; a layer of germanium with a bottom side attached to the top surface of the second sub-layer; and a third sub-layer embedded into a top side of the layer of germanium, characterized by heavy p++ doping state.

Abstract: An all-solid-state battery includes a solid electrode body including a positive electrode layer, a solid electrolyte layer, and a negative electrode layer, and a laminate film that stores the solid electrode body. The laminate film has a fragile part with respect to a needle-like foreign substance. The strength of the fragile part is lower than the strength of a part of the laminate film other than the fragile part.

Abstract: A liquid discharge head includes a plurality of nozzles configured to discharge a liquid, a plurality of pressure chambers respectively communicating with the plurality of nozzles, a plurality of common-supply branch channels each communicating with two or more of the plurality of pressure chambers, a common-supply main channel communicating with each of the plurality of common-supply branch channels, a plurality of common-collection branch channels each communicating with two or more of the plurality of pressure chambers, and a common-collection main channel communicating with each of the plurality of common-collection branch channels. The plurality of nozzles is arrayed in a two-dimensional matrix in a first direction and a second direction intersecting with the first direction, the plurality of common-supply branch channels and the plurality of common-collection branch channels are alternately arranged in the second direction.

Abstract: A cell, which is a non-aqueous electrolyte secondary battery, includes: an electrode assembly including a plurality of sheet-shaped positive electrodes and a plurality of sheet-shaped negative electrodes, the plurality of positive electrodes and the plurality of negative electrodes being alternately stacked with separators interposed therebetween; and a battery case that houses the electrode assembly. The electrode assembly includes: an outer layer including a positive electrode arranged on an outermost side of the electrode assembly, and a separator adjacent to the positive electrode; and an inner layer arranged on an inner side of the outer layer. The outer layer includes a fusing member configured to fuse due to heat generation in the electrode assembly caused by a short circuit in the electrode assembly. The inner layer does not include the fusing member.

Abstract: A cell that is a non-aqueous electrolyte secondary battery includes an electrode body in which a sheet-shaped positive electrode and a sheet-shaped negative electrode are stacked via a separator, and a battery case that accommodates the electrode body and an electrolytic solution. The electrode body includes a predetermined number of outer layers including an outermost layer made up of the separator and the negative electrode disposed on an outermost side of the electrode body, and an inner layer disposed on an inner side than the outer layer. The outer layer includes a negative electrode mixture layer configured to suppress heat generation of the electrode body caused by a short circuit of the electrode body as a heat generation suppressing member. The inner layer does not include the heat generation suppressing member.

Abstract: A silicon photonic device includes a silicon-on-insulator substrate, a waveguide, and a plate. The silicon-on-insulator substrate includes a silicon layer and a silicon dioxide layer. The waveguide is disposed on the silicon-on-insulator substrate. The silicon dioxide layer at least partially overlays the waveguide. The plate exhibits metallic characteristics and is at least partially embedded in the silicon dioxide layer of the silicon-on-insulator substrate. The plate is spaced apart from the waveguide and is configured to mitigate transverse magnetic emission propagating through the waveguide.

Abstract: An unmanned aerial vehicle includes a main body, a propulsion assembly including a rotary blade and a motor to rotate the rotary blade about a rotation axis, the propulsion assembly being attached to the main body, a rechargeable battery to supply electric power to the propulsion assembly, a leg portion connected to the main body on a lower side of the main body in a vertical direction, and a power receiving coil to provide non-contact power feeding, the power receiving coil being electrically connected to the battery and being provided in the leg portion.

Abstract: An exposure device that draws a pattern on a substrate by shining a beam from a light source device on substrate and scanning the beam in a main scanning direction while varying the intensity of beam according to pattern information, including: a scanning unit having a beam scanning unit that includes a polygonal mirror whereby the beam is oriented to scan the beam, and light detector for photoelectric detection of reflected light generated when beam is shined on substrate; an electro-optical element for controlling the beam's intensity modulation according to pattern information such that at least part of second pattern to be newly drawn is drawn on top of at least part of first pattern formed on substrate; and a measurement unit measuring relative positional relationship between the first and second pattern on the basis of a detection signal output by the detector while second pattern is drawn on substrate.

Abstract: Provided are particulate polyvinyl alcohol-based diverting agents for use in subterranean treatments, which are prepared by compacting a specified polyvinyl alcohol copolymer optionally with certain specified additives and optionally other polyvinyl alcohols.

Abstract: An exposure device that draws a pattern on a substrate by shining a beam from a light source device on substrate and scanning the beam in a main scanning direction while varying the intensity of beam according to pattern information, including: a scanning unit having a beam scanning unit that includes a polygonal mirror whereby the beam is oriented to scan the beam, and light detector for photoelectric detection of reflected light generated when beam is shined on substrate; an electro-optical element for controlling the beam's intensity modulation according to pattern information such that at least part of second pattern to be newly drawn is drawn on top of at least part of first pattern formed on substrate; and a measurement unit measuring relative positional relationship between the first and second pattern on the basis of a detection signal output by the detector while second pattern is drawn on substrate.

Abstract: Provided are low dust-content particulate polyvinyl alcohol-based compositions suitable for a variety of end uses including for use in subterranean treatments and for manufacturing chemical materials, which are prepared by compacting a specified polyvinyl alcohol polymer resins, optionally with specified additives and/or other polyvinyl alcohols.