Abstract:
A wavelength specific optical equalizer for selectively attenuating discrete wavelength signals contained within a wavelength division multiplexed signal without affecting the adjacent signals. The wavelength equalizer includes a demultiplexer adapted to separate a wavelength division multiplexed signal into a plurality of discrete wavelength signals and to direct each of the discrete wavelength signals along a plurality of first optical paths. A micro-mechanical device comprising at least one micro-mirror is optically coupled with each of the first optical paths. A plurality of second optical paths is positioned to receive the discrete wavelength signals reflected from the respective micro-mirrors. At least one actuator is mechanically coupled with each of the micro-mirrors. The actuators are adapted to selectively displace one or more to divert at least a portion of the discrete wavelength away from the corresponding second optical paths. The orientation of the micro-mirror determines a signal strength of the discrete wavelength signal reflected to the corresponding second optical path. A multiplexer is provided to combine the discrete wavelength signals in the plurality of second optical paths into a reconstituted wavelength division multiplexed signal.
Abstract:
The present invention provides a digitizer that includes a transparent overlay that incorporates a transparent material pattern that is coded to be indicative of position and detection device configured to read the pattern for determining position information. The transparent material of the coded pattern can include infrared sensitive materials, for example. Transparent digitizers of the present invention may be useful in applications such as Tablet PC mobile computers.
Abstract:
Capacitive sensing devices are provided that include a sensing pattern of conductive traces disposed upon the surface of a substrate and a first passive circuit element that includes a metallic conductor disposed upon the same surface of the substrate. In some embodiments, the first passive circuit element is a component of an electronic circuit that can be, for example, a low pass filter. Provided capacitive sensing devices are useful, for example, when incorporated into projected touch screen display panels for use on electronic devices.
Abstract:
Presently described are articles such as antennas, EMI shields, and touch screen sensors as well as patterned substrates having overlaid micropatterns with low visibility. Also described are methods of determining the visibility of a patterned substrate. In one embodiment, a patterned substrate is described comprising a visible light transparent substrate; and at least two overlaid electrically conductive mesh micropatterns, wherein each mesh has a repeating cell geometry and the combination of overlaid micropatterns has a spatial constrast threshold at a distance of 30000 units of greater than - 35 decibels.
Abstract:
A micrometer sized, single-stage, horizontal and vertical thermal actuator capable of repeatable and rapid movement of a micrometer-sized optical device off the surface of a substrate. The horizontal and vertical thermal actuator is constructed on a surface of a substrate. At least one hot arm has a first end anchored to the surface and a free end located above the surface. A cold arm has a first end anchored to the surface and a free end. The cold arm is located above and laterally offset from the hot arm relative to the surface. The cold arm is adapted to provide controlled bending near the first end thereof. A member mechanically and electrically couples the free ends of the hot and cold arms such that the actuator exhibits horizontal and vertical displacement when current is applied to at least the hot arm.
Abstract:
A touch-sensitive device with stylus includes a touch panel, a touch panel drive unit, a stylus sense unit, and a measurement unit. A touch by a stylus proximate to a touch panel electrode changes a capacitive coupling between the touch panel electrode and a stylus electrode. The amplitude of the response signal is responsive to the capacitive coupling between the touch panel electrode and the stylus electrode, and is measured to provide an indication of the position of the stylus electrode relative to the touch panel.
Abstract:
A touch sensitive apparatus having a plurality of drive electrodes and a plurality of receive electrodes, the drive electrodes and receive electrodes capacitively coupled to each other. A touch measurement circuit configured to identify touch events on the touch sensitive device by comparing a first time period to a second time period. The first time period can be, for example, representative of a length of time a periodic receive signal carried by a receive electrode is above or below a threshold voltage level.
Abstract:
An apparatus for equalizing polarization mode dispersion in an optical signal traveling through an optical fiber. A polarization mode separator separates the optical signal into a first polarized signal and a second differently polarized signal traveling along respective first and second paths. A first variable delay generator located along the first path is adapted to selectively provide a first propagation delay to the first polarized signal. The first variable delay generator includes at least two rotating micro-mirrors and one or more fixed mirrors constructed on a surface of a substrate. The fixed mirrors include a plurality of optical paths of differing lengths adapted to optically couple with the two rotating micro-mirrors. A controller is coupled to the first variable delay generator. The controller is adapted to monitor the polarization mode dispersion in the optical signal and to position the rotating micro-mirrors to direct the first polarized signal along one of the plurality of optical paths. A beam combiner is coupled to the first and second optical paths after the first variable delay generator. The beam combiner combines the first and second signals to form an optical output signal substantially compensated for polarization mode dispersion.
Abstract:
A MEMS-based device to steer and manipulate beams of light traveling in free-space in an optical switch. The optical switch is based on a rotating vertical micro-mirror constructed on a surface of a substrate. At least one input optical fiber is arranged to direct at least one optical signal through free-space along a first optical path parallel to the surface of the substrate. A plurality of output optical fibers are arranged to receive the optical signal traveling through free-space along other optical paths not co-linear with the first optical path. At least one substantially vertical, rotating micro-mirror assembly is constructed on the substrate. The assembly includes a rotating micro-mirror with a vertical centerline and an axis of rotation both perpendicular to the surface, but not co-linear. The rotating micro-mirror is rotatable between a first position not in the first optical path and at least a second position redirecting the optical signal to one of the output optical fibers.
Abstract:
An apparatus for equalizing polarization mode dispersion in an optical signal traveling through an optical fiber. A polarization mode separator separates the optical signal into a first polarized signal and a second differently polarized signal traveling along respective first and second paths. A first variable delay generator located along the first path is adapted to selectively provide a first propagation delay to the first polarized signal. The first variable delay generator includes at least two rotating micro-mirrors and one or more fixed mirrors constructed on a surface of a substrate. The fixed mirrors include a plurality of optical paths of differing lengths adapted to optically couple with the two rotating micro-mirrors. A controller is coupled to the first variable delay generator. The controller is adapted to monitor the polarization mode dispersion in the optical signal and to position the rotating micro-mirrors to direct the first polarized signal along one of the plurality of optical paths. A beam combiner is coupled to the first and second optical paths after the first variable delay generator. The beam combiner combines the first and second signals to form an optical output signal substantially compensated for polarization mode dispersion.