子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 161 | X-ray multiband emission and conversion | US14095513 | 2013-12-03 | US09478692B1 | 2016-10-25 | David R. Twede; Del E. Vicker |
| A photonic conversion layer receives incoming photons in a plurality of X-ray bands, the incoming photons passing through an item on a path from an X-ray source to the photonic conversion layer. The incoming photons are converted in each X-ray band of the plurality of X-ray bands to outgoing photons in corresponding different converted bands in the visible-to-near infrared (VNIR) spectrum. The outgoing photons are emitted in the corresponding different converted bands in the VNIR spectrum. A sensor detects the outgoing photons in the corresponding different converted bands in the VNIR spectrum and generates output data representative of the outgoing photons. Image data is generated based on the output data. | ||||||
| 162 | Method and apparatus of monitoring and tracking optical frequency differences of modulated beams | US14187589 | 2014-02-24 | US09267799B2 | 2016-02-23 | Tiequn Qiu; Waymon Ho |
| A method of measuring beat frequency comprises modulating a first optical signal and a second optical signal, wherein the first modulated optical signal includes a first carrier frequency and a first plurality of sideband frequencies and the second modulated optical signal includes a second carrier frequency and a second plurality of sideband frequencies. The method also comprises combining a fraction of the first modulated optical signal with a fraction of the second modulated optical signal into a combined signal and determining a carrier beat frequency. The method further comprises selecting a frequency range from the combined signal; performing a fast Fourier transform (FFT) on an electrical signal representing the selected frequency range; tracking the carrier beat frequency based on the FFT; and outputting a rate signal based on the tracked carrier beat frequency, the rate signal indicating a rotation rate of the resonator fiber optic gyroscope. | ||||||
| 163 | Multiple filter photon conversion assembly | US14107231 | 2013-12-16 | US09110292B1 | 2015-08-18 | David R. Twede; Bryan C. Gundrum |
| A photon conversion assembly. A first filter assembly is configured to transmit photons in at least one received band in a downstream direction of an optical pathway and to reflect photons in at least one converted band that are moving in an upstream direction of the optical pathway. A photon conversion material has a first side and a second side. The first side is downstream of the first filter assembly, and the second side is upstream of a second filter assembly. The photon conversion material is configured to convert photons in at least one received band to photons in at least one converted band. A second filter assembly is configured to transmit photons in the at least one converted band in a downstream direction of the optical pathway and to reflect photons in the at least one received band that are moving in the downstream direction of the optical pathway. | ||||||
| 164 | DISPERSION TOLERANT OPTICAL SYSTEM AND METHOD | US13951058 | 2013-07-25 | US20140219664A1 | 2014-08-07 | Marco ROMAGNOLI; Paola GALLI |
| An optical communication system and method of use are described. The system comprises an optical source adapted to receive a digitally encoded data signal comprising sequences of data at a data rate (B) and comprising two signal levels representing a first state and a second state of the data signal, the optical source being adapted to produce an optical signal substantially frequency modulated with frequency excursion Δν comprising a first instantaneous frequency (ν0) associated to the first state and a second instantaneous frequency (ν1) associated to the second state; an optical converter adapted to receive the substantially frequency modulated optical signal, the optical converter having an optical transfer function varying with frequency and including at least one pass band, the at least one pass band having a peak transmittance and at least a low-transmittance region. | ||||||
| 165 | Optical communication system | US13502887 | 2010-10-15 | US08649680B2 | 2014-02-11 | Atsushi Okamoto; Kazuyuki Morita |
| The present invention causes spatial-mode light emitted from an optical fiber (11), which is a multimode fiber, to pass through a photorefractive medium (13). The photorefractive medium (13) includes holograms for signal separation that are written by irradiation of the photorefractive medium with (i) guide light having a wave front identical to the wave front of signal light having a particular spatial mode and (ii) control light. The photorefractive medium includes holograms recorded in a multiplex manner with use of control light having different incidence angles in correspondence with respective spatial modes. For signal separation, irradiating the photorefractive medium (13) with control light (15) having a particular angle separates signal light having a spatial mode corresponding to the incidence angle of the control light (15). | ||||||
| 166 | MODULATED SIGNAL DETECTING APPARATUS AND MODULATED SIGNAL DETECTING METHOD | US13817952 | 2012-08-16 | US20130271823A1 | 2013-10-17 | Kiyotaka Ito; Yasumori Hino |
| A phase difference error detecting unit detects a phase difference error component included in a phase difference component; a phase difference correcting unit corrects a first signal having the phase difference component as an angle of a cosine function and a second signal whose angle of the cosine function differs from that of the first signal by approximately π/2 based on the detected phase difference error component; a phase operating unit operates a phase difference component from the first signal and the second signal corrected by the phase difference correcting unit; and the phase difference correcting unit obtains the corrected first signal and the corrected second signal by rotating a coordinate point represented by the first signal and the second signal on a polar coordinate plane by an angle corresponding to the phase difference error component. | ||||||
| 167 | Compensation method, optical modulation system, and optical demodulation system | US13748000 | 2013-01-23 | US08493647B2 | 2013-07-23 | Yoshiharu Fujisaku |
| An optical modulation system has a function to compensate an operating point drift, which occurs in an MZ optical modulator, by carrying out feedback control with use of a low frequency signal. A judgment section judges stability of feedback control. In a case where the feedback control is determined to be unstable, a low frequency signal generating section switches a frequency of the low frequency signal from a first frequency to a second frequency. | ||||||
| 168 | PLC-type delay demodulation circuit | US13336111 | 2011-12-23 | US08441717B2 | 2013-05-14 | Hiroshi Kawashima; Kazutaka Nara |
| The PLC-type delay demodulation circuit includes a planar lightwave circuit that is provided on one PLC chip and demodulates a DQPSK signal. The planar lightwave circuit includes a Y-branch waveguide that branches a DQPSK-modulated optical signal into two optical signals and first and second MZIs that delay the branched optical signals by one bit. A wave plate is provided in central portions of first and second arm waveguides of the first MZI and first and second arm waveguides of the second MZI in such a manner that the wave plate intersects all of the four arm waveguides, the four arm waveguides being close to one another in a portion where the wave plate is provided. | ||||||
| 169 | PLC-type delay demodulation circuit | US13333432 | 2011-12-21 | US08422118B2 | 2013-04-16 | Hiroshi Kawashima; Kazutaka Nara |
| A PLC-type delay demodulation circuit includes a planar lightwave circuit that is provided on one PLC chip and demodulates a DQPSK signal. The planar lightwave circuit includes a Y-branch waveguide that branches a DQPSK-modulated optical signal into two optical signals and first and second MZIs that delay the branched optical signals by one bit. The length of a short arm waveguide of the first MZI is different from the length of a short arm waveguide of the second MZI, and the length of an optical path from the Y-branch waveguide to output ports of the first MZI through the short arm waveguide of the first MZI is equal to that of an optical path from the Y-branch waveguide to output ports of the second MZI through the short arm waveguide of the second MZI. | ||||||
| 170 | GENERATING AND DETECTING RADIATION | US13384214 | 2010-07-19 | US20120113417A1 | 2012-05-10 | Edmund Linfield; John Cunningham; Alexander Giles Davies; Christopher Wood; Paul John Cannard; David Graham Moodie; Xin Chen; Michael James Robertson |
| A method of generating radiation comprises: manufacturing a structure comprising a substrate supporting a layer of InGaAs, InGaAsP, or InGaAlAs material doped with a dopant, said manufacturing comprising growing said layer such that said dopant is incorporated in said layer during growth of the layer; illuminating a portion of a surface of the structure with radiation having photon energies greater than or equal to a band gap of the doped InGaAs, InGaAsP, or InGaAlAs material so as to create electron-hole pairs in the layer of doped material; and accelerating the electrons and holes of said pairs with an electric field so as to generate radiation. In certain embodiments the dopant is Fe. Corresponding radiation detecting apparatus, spectroscopy systems, and antennas are described. | ||||||
| 171 | Coupler and related method for equilibrating a duality modulated beam with another beam using one or more mach-zehnder stages | US13023396 | 2011-02-08 | US08081383B1 | 2011-12-20 | Stuart G. Mirell; Daniel J. Mirell |
| A generator of duality modulated radiation, of which the irradiance, the wave intensity, or both, are varied from ordinarily equivalent levels, either for purposes of providing energy depleted or energy enriched radiation or for purpose of encoding an information signal. Various techniques are disclosed for restoring irradiance levels to “ordinary” levels, or for amplifying irradiance without affecting wave intensity. A communication system also employs duality modulated radiation. | ||||||
| 172 | Delayed interferometer and optical receiver | US12929784 | 2011-02-15 | US20110217048A1 | 2011-09-08 | Takashi Shimizu; Takashi Yamane |
| A delayed interferometer includes a branching unit that branches an optical signal into a first optical signal and a second optical signal; a guiding unit that guides the first optical signal in a first optical path to delay the first optical signal when a polarization direction of the first optical signal is the first direction, and guides the first optical signal in a second optical path when the polarization direction of the first optical signal is the second direction perpendicular to the first direction; a demodulating unit that causes the first optical signal guided in the first optical path or the second optical path and the second optical signal branched by the branching unit to interfere with each other, thereby demodulating the optical signal; and a polarization direction adjusting unit to adjust the polarization direction of the first optical signal in the first direction or the second direction. | ||||||
| 173 | INTERFEROMETER, DEMODULATOR, AND OPTICAL COMMUNICATION MODULE | US12985385 | 2011-01-06 | US20110188850A1 | 2011-08-04 | Hideharu MIKAMI; Taichi Kogure |
| When designing a demodulator for a DPSK-modulated signal, it is required that optical phase modulation is performed fast and the demodulator has a long lifetime. To achieve this object, a delay line interferometer inside the demodulator performs adjustment of phase difference between two split lights caused to interfere, using a first optical phase modulation unit such as a Piezo actuator and a second optical phase modulation unit such as a heating element that operates slower in modulation speed than the first optical phase modulation unit and is slower in deterioration speed. | ||||||
| 174 | Temperature Controlled Interferometer For Phase Demodulation | US12437549 | 2009-05-07 | US20100135677A1 | 2010-06-03 | Reuven Zaibel; Gil Blecher |
| An interferometer includes an optical beam splitter that splits an input optical signal into a first optical signal propagating in a first optical path comprising free space and a second optical signal propagating in a second optical path comprising a dielectric medium. A differential delay delays the second optical signal relative to the first optical signal by a differential delay time that is proportional to at least one of a temperature and a refractive index of the dielectric medium. A temperature controller in thermal contact with the dielectric medium changes the temperature of the dielectric medium to control at least one of thermal expansion/contraction and a temperature dependent change in the refractive index of the dielectric medium, thereby changing the differential phase delay. An optical beam splitter/combiner optically coupled to the first and second optical paths generates a first and second interferometric optical signal having an amplitude and phase that is related to the differential delay. | ||||||
| 175 | Coherent Demodulation with Reduced Latency Adapted for use in Scanning Probe Microscopes | US12324042 | 2008-11-26 | US20100128342A1 | 2010-05-27 | Daniel Y. Abramovitch |
| A signal demodulator and the method of using the same in a scanning probe microscope or the like to provide a feedback path with reduced latency are disclosed. The demodulator includes an input port, a first mixer and a first integrator. The input port receives an input signal having a frequency component at a signal frequency. The input signal is characterized by a signal amplitude at that frequency. The first mixer mixes the input signal with a first local oscillator signal at the signal frequency to generate a first mixed signal. The first integrator integrates the first mixed signal for an integer number of periods of the signal frequency to provide a first output signal. | ||||||
| 176 | DELAY-LINE DEMODULATOR | US12248871 | 2008-10-09 | US20090097101A1 | 2009-04-16 | Junichi Hasegawa; Kazutaka Nara |
| Problem to be Solved To provide a delay-line demodulator of which the divergence amount of polarization is reduced.Solution: A delay-line demodulator 1 for a DQPSK signal to be demodulated comprises two of Mach-Zehnder interferometers 6 and 7 individually comprising two of waveguides having different lengths therebetween through which a light signal branched the DQPSK signal propagates respectively, for delaying a phase of the light signal propagating at one of the waveguides as an amount of one symbol comparing to a phase of the light signal propagating at another one of the waveguides, wherein a divergence amount of polarization is adjusted by driving a first heater A and a fourth heater D, or a third heater B and a second heater C, that are facing to each other as sandwiching a half wavelength plate therebetween. | ||||||
| 177 | Photonic oscillator | US11023918 | 2004-12-27 | US07324256B1 | 2008-01-29 | Keyvan Sayyah |
| A photonic oscillator includes an optical transceiver that serves the dual purpose of detecting a feedback RF lightwave signal carried on a laser beam and electrically filtering the RF lightwave signal to modulate the RF lightwave signal in accordance therewith, to thereby set up steady state oscillations in the modulated RF lightwave signal and thereby generate a multi-tone oscillating lightwave. | ||||||
| 178 | Method and apparatus for generating and detecting duality modulated electromagnetic radiation | US11188198 | 2005-07-22 | US07262914B2 | 2007-08-28 | Stuart Gary Mirell; Daniel Joseph Mirell |
| A generator of duality modulated radiation, of which the irradiance, the wave intensity, or both, are varied from ordinarily equivalent levels, either for purposes of providing energy depleted or energy enriched radiation or for purpose of encoding an information signal. Various techniques are disclosed for restoring irradiance levels to “ordinary” levels, or for amplifying irradiance without affecting wave intensity. A communication system employing duality modulated radiation is also disclosed. | ||||||
| 179 | Method and apparatus for generating and detecting duality modulated electromagnetic radiation | US11188198 | 2005-07-22 | US20070019281A1 | 2007-01-25 | Stuart Mirell; Daniel Mirell |
| A generator of duality modulated radiation, of which the irradiance, the wave intensity, or both, are varied from ordinarily equivalent levels, either for purposes of providing energy depleted or energy enriched radiation or for purpose of encoding an information signal. Various techniques are disclosed for restoring irradiance levels to “ordinary” levels, or for amplifying irradiance without affecting wave intensity. A communication system employing duality modulated radiation is also disclosed. | ||||||
| 180 | METHOD AND DEVICE FOR DIRECT ULTRAHIGH SPEED CONVERSION FROM TIME SIGNAL TO SPACE SIGNAL | US11381626 | 2006-05-04 | US20060241500A1 | 2006-10-26 | Tsuyoshi Konishi; Yoshiki Ichioka |
| A signal light pulse and a reference ultra-short light pulse each having an appropriate spatially lateral width are launched simultaneously into an ultra-high-speed optical memory element from both sides of an optical axis thereof at appropriate angles with respect to the axis. Temporal waveforms of the signal light pulse and reference ultra-short light pulse are projected onto a plane. An interference fringe produced by interference between spatial projection images of two moving light waves corresponding to cross-correlation waveforms of the signal light pulse and reference ultra-short light pulse is retained in the ultra-high-speed optical memory element. A spatial distribution of self-diffracted light of the reference ultra-short light pulse produced in accordance with the spatial distribution of the retained interference fringe corresponding to the cross-correlation waveforms is imaged using an image forming lens and thus, is converted into a spatial distribution corresponding to the temporal waveform of the input signal light pulse. | ||||||
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