Abstract: Techniques for detecting presence of a remote device at Layer 2 in response to an indication of an attempt to use the device and without maintaining a Layer 3 connection to the device. The techniques allow reducing power consumption without compromising the device's availability. A device that pairs with a remote wireless device may establish a Layer 3 connection to the remote device to provide services to a user. The Layer 3 connection and underlying Layer 2 connection (e.g., WI-FI, WI-FI DIRECT™ or BLUETOOTH®) may be terminated when the Layer 3 connection is not actively used. Once use of the remote device is desired, its presence may be detected using a Layer 2 device discovery mechanism and the Layer 2 and Layer 3 connections to the device may be reestablished. Services provided at Layer 3, such as steaming data, may then be performed over the reestablished Layer 3 connection.

Abstract: An embodiment of the invention provides a coupled waveguide photo detector device. Optically, the device includes an input waveguide. An output waveguide is coupled to the input waveguide with a nonuniform coupling coefficient in a coupling section. An absorber is included in the coupling section to convert an absorbed portion of optical radiation into photo current. The location of absorber and the optical radiation intensity pattern in the coupling section are set to control the maximum intensity of output power absorbed by the output waveguide to be within a predetermined limit that avoids saturation. The absorber is also part of a transmission line collector which has a phase and group velocity to match those of the optical wave in the coupling section such that currents collected by the transmission line collector add in phase as the optical wave propagates in the output waveguide.

Abstract: A flow control device and a related cooled electronic system are provided. The electronic system comprises a first heat dissipation component and a second heat dissipation component. The flow control device controls an amount of an air flow to the first heat dissipation component and the second heat dissipation component. In one illustrative embodiment, the flow control device comprises: a memory metal component coupled to the first heat dissipation component and the second heat dissipation component and a movable component comprising a first end and a second end. The first end is coupled to a point between two ends of the memory metal component and the second end is movable with respect to the first end. In response to a temperature difference between the first heat dissipation component and the second heat dissipation component, the second end approaches the first heat dissipation component or the second heat dissipation component.

Abstract: An embodiment of the invention provides a coupled waveguide photo detector device. Optically, the device includes an input waveguide. An output waveguide is coupled to the input waveguide with a nonuniform coupling coefficient in a coupling section. An absorber is included in the coupling section to convert an absorbed portion of optical radiation into photo current. The location of absorber and the optical radiation intensity pattern in the coupling section are set to control the maximum intensity of output power absorbed by the output waveguide to be within a predetermined limit that avoids saturation. The absorber is also part of a transmission line collector which has a phase and group velocity to match those of the optical wave in the coupling section such that currents collected by the transmission line collector add in phase as the optical wave propagates in the output waveguide.

Abstract: A method for optical modulation comprising the steps of guiding an optical wave in an optical waveguide, the optical wave having an evanescent tail; and applying a modulation voltage to the evanescent tail.

Abstract: An electric fan comprises a rotary hub comprising a hollow two-layer cylinder including a plurality of units each including: a gap between the layers, an axial first coupling edge abutted on an adjacent unit, an arcuate second coupling edge at its inner end joined with the first coupling edge, two internal ridges, and a rib interconnected the cylinder and a central sleeve; and a plurality of detachable blades comprising a blade section and a base including a raised member, a connecting edge in a joining portion of the blade section and the raised member, two side shoulders, and a forward, downward projection. Each base is inserted into the gap with the shoulders engaged with the ridges, the connecting edge engaged with the second coupling edge, and one side of the raised member engaged with the first coupling edge respectively. Also, each projection is threadedly secured to each rib.

Abstract: In the band edge region, transmission and reflection of an optical wave can be made very sensitive to the change in radiation wavelength, a change in the modulator material refractive index, and/or a change in the material absorption. Controlling these parameters with the increased level of sensitivity is provided by modulation using the band edge region. A preferred embodiment method of the invention uses a periodic optical structure (i.e., a grating) on top of an optical waveguide structure. The combination of the periodic structure and the optical waveguide is designed so that the reflection and/or transmission of the guided wave have broad pass bands with narrow transition bands. The optical structure is exposed to an incident laser radiation with wavelength in one of the transition bands. Modulation of the incident laser radiation is controlled by the change in refractive index or absorption in the optical guided wave structure produced by the modulation voltage.

Abstract: In the band edge region, transmission and reflection of an optical wave can be made very sensitive to the change in radiation wavelength, a change in the modulator material refractive index, and/or a change in the material absorption. Controlling these parameters with the increased level of sensitivity is provided by modulation using the band edge region. A preferred embodiment method of the invention uses a periodic optical structure (i.e., a grating) on top of an optical waveguide structure. The combination of the periodic structure and the optical waveguide is designed so that the reflection and/or transmission of the guided wave have broad pass bands with narrow transition bands. The optical structure is exposed to an incident laser radiation with wavelength in one of the transition bands. Modulation of the incident laser radiation is controlled by the change in refractive index or absorption in the optical guided wave structure produced by the modulation voltage.

Abstract: A molded plastic package for semiconductor devices incorporating a heat sink, controlled impedance leads and separate power and ground rings is described. The lead frame of the package, separated by a dielectric layer, is attached to a metal heat sink. It has more than one ring for power and ground connections. The die itself is attached directly onto the heat sink through a window on the dielectric and provides high power dissipation. The package is molded using conventional materials and equipment.

Abstract: A molded plastic package for semiconductor devices incorporating a heat sink, controlled impedance leads and separate power and ground rings is described. The lead frame of the package, separated by a dielectric layer, is attached to a metal heat sink. It has more than one ring for power and ground connections. The die itself is attached directly onto the heat sink through a window on the dielectric and provides high power dissipation. The package is molded using conventional materials and equipment.

Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a polysulfone polymer and a filler or polysulfone polymer and structure enhancing agent, said sheet product having a fibrous sheet embedded within said mixture and between the first and second major surfaces. The porosity of the sheet product is at least about 60 volume percent composed of pores such that the average pore diameter increases from each major surface toward the interior of the sheet product's thickness.

Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a thermoplastic polyurethane polymer having a high degree of hard segments with a filler or said polyurethane with a structure enhancing agent, said sheet product having a sheet embedded within said mixture and between the first and second major surfaces. The sheet product has porosity of at least about 50 volume percent composed of pores such that the nominal pore diameter increases from each major surface towards the interior, center of the sheet product's thickness.

Abstract: The improved intensity modulator comprises a directional coupler with a single active coupling section with a fixed amount of coupling along with a single pair of electrodes for supplying a voltage-controlled mismatch in propagation constants. Two passively-biased coupling sections are connected in series with the active section, with the two passive sections combined being at least one coupling length long. The bias voltage of the two passive sections are independently varied to compensate for non-linearities by providing additional coupling. In addition to a DC bias voltage, the active coupling section is supplied with an RF signal which may propagate from its input end to its output, along with the optical signal, if a traveling wave electrode is used. Alternate embodiments provide temperature-induced drift compensation and reduction of chirping.

Abstract: The improved intensity modulator comprises a directional coupler with a single active coupling section with a fixed amount of coupling along with a single pair of electrodes for supplying a voltage-controlled mismatch in propagation constants. Two passively-biased coupling sections are connected in series with the active section, with the two passive sections combined being at least one coupling length long. The bias voltage of the two passive sections are independently varied to compensate for non-linearities by providing additional coupling. In an alternate embodiment, a voltage-controlled directional coupler is connected in series with a fixed Mach-Zehnder modulator and a fixed directional coupler, and linearity is obtained by varying the phase shift of the Mach-Zehnder modulator, the length of the fixed directional coupler, and the length and coupling coefficient of the active coupler.

Abstract: Method for deposit of a p type dopant from a dopant layer into a predetermined region of a III-V semiconductor layer or multiple layers. The p type dopant is deposited in very high concentration in a semiconductor layer adjacent to the predetermined region. A second semiconductor layer, doped with a lower concentration of an n type dopant, is later deposited so that the high concentration p type dopant layer lies between the predetermined region and the n type dopant layer. The p type dopant is diffused into the predetermined region by thermally driven diffusion, which may be carried out at a lower temperature or for a shorter diffusion time interval than with conventional diffusion, and p type dopant diffusion may extend over greater distances.

Abstract: In the band edge region, transmission and reflection of an optical wave can be made very sensitive to the change in radiation wavelength, a change in the modulator material refractive index, and/or a change in the material absorption. Controlling these parameters with the increased level of sensitivity is provided by modulation using the band edge region. A preferred embodiment method of the invention uses a periodic optical structure (i.e., a grating) on top of an optical waveguide structure. The combination of the periodic structure and the optical waveguide is designed so that the reflection and/or transmission of the guided wave have broad pass bands with narrow transition bands. The optical structure is exposed to an incident laser radiation with wavelength in one of the transition bands. Modulation of the incident laser radiation is controlled by the change in refractive index or absorption in the optical guided wave structure produced by the modulation voltage.