Class / Patent application number | Description | Number of patent applications / Date published |
324095000 | With waveguide or long line | 8 |
20090021238 | OPTICAL DEVICE AND METHOD OF CONTROLLING THE SAME - An optical device includes an optical element, a detector and a controller. The optical element has an optical waveguide. Refractive index of the optical waveguide is controlled by a heater. A temperature of the optical element is controlled by a temperature control device. The detector detects a current flowing in the heater and/or a voltage applied to the heater. The controller controls an electrical power provided to the heater so as to be kept constant according to the detection result of the detector. | 01-22-2009 |
20090027038 | Systems And Methods That Detect Changes In Incident Optical Radiation - Systems, methods and sensors detect changes in incident optical radiation. Current is driven through one or more active areas of a detector while the incident optical radiation illuminates the active areas. Voltage is sensed across one or more of the active areas, a change in the voltage being indicative of the changes in incident optical radiation. | 01-29-2009 |
20090243589 | SURFACE-PLASMON DETECTOR BASED ON A FIELD-EFFECT TRANSISTOR - According to one embodiment, a surface-plasmon (SP) beam generated by an SP source and directed via an SP waveguide is applied to a gate node of a field-effect transistor (FET). The FET also has a source node and a drain node. In a representative configuration, the gate, source, and drain nodes are electrically biased to pass an electrical current between the source and drain nodes in a manner that makes the electrical current responsive to the intensity of the SP beam. | 10-01-2009 |
20120091991 | ELECTRIC CURRENT MEASURING APPARATUS - An electric measuring apparatus is constructed in such a way as to include a signal processing circuit equipped with at least a polarized light separating unit, Faraday rotators, a light source, a photoelectric conversion element, and optical fibers for a sensor. The optical fibers for the sensor are placed around the periphery of an electrical conductor through which electric current to be measured flows. Furthermore, the rotation angle of each Faraday rotator at the time when the magnetism of each Faraday rotator is saturated is set to 22.5°+α° at a temperature of 23° C., thereby changing the rotation angle of each Faraday rotator by α° from 22.5°. | 04-19-2012 |
20130278241 | DIGITAL CLOSED-LOOP FIBER OPTICAL CURRENT SENSOR - This present inversion provides a digital closed-loop fiber optical current sensor. The modulation signal of the optical wave “phase modulator” of the fiber optical current sensor system is modulation square wave, signal processing system extracts any harmonic wave of the photoelectric converter output modulation square waves, and extracts the measured current information from it. The preamplifier of signal processing system is transimpedance amplifier TIA, the bandwidth is extracted 1/650 instantaneous amplitude square wave directly from the modulation square wave (existing), thus the thermal noise of the preamplifier output and shot noise level is reduced to the existing technology of below 1/650; the current-voltage gain of transimpedance amplifier TIA does not depend on the feedback network resistance, thus it can have high current-voltage conversion gain and use low resistance in the feedback network TIA at the same time. So it can reduce resistance thermal noise to negligible that is accounted for a large proportion of TIA output noise. | 10-24-2013 |
20140239940 | MICROFABRICATED CALORIMETER FOR RF POWER MEASUREMENT - Disclosed is a radio frequency (RF) power calorimeter having a load electrically coupled to a RF input, a variable low-frequency power source electrically coupled to the load and configured to apply low-frequency bias to the load. The RF power calorimeter includes a thermal medium thermally coupled to the load. Additionally, the RF power calorimeter includes an outlet temperature sensor thermally coupled to the thermal medium, the outlet temperature sensor being positioned to measure the temperature of the thermal medium due to heating by the load. The RF power calorimeter also has circuitry configured to use temperature measurements of the thermal medium in thermal contact with an RF load in combination with the low-frequency bias to measure average power of an RF source electrically coupled to the RF input. Also disclosed in a method of measuring RF power using the RF power calorimeter. | 08-28-2014 |
20160025783 | MICROFABRICATED CALORIMETER FOR RF POWER MEASUREMENT - Disclosed is a radio frequency (RF) power calorimeter having a load electrically coupled to a RF input, a variable low-frequency power source electrically coupled to the load and configured to apply low-frequency bias to the load. The RF power calorimeter includes a thermal medium thermally coupled to the load. Additionally, the RF power calorimeter includes an outlet temperature sensor thermally coupled to the thermal medium, the outlet temperature sensor being positioned to measure the temperature of the thermal medium due to heating by the load. The RF power calorimeter also has circuitry configured to use temperature measurements of the thermal medium in thermal contact with an RF load in combination with the low-frequency bias to measure average power of an RF source electrically coupled to the RF input. Also disclosed in a method of measuring RF power using the RF power calorimeter. | 01-28-2016 |
20160169942 | SENSOR UNIT | 06-16-2016 |