| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 141 | Full-duplex RF link for multi-channel wideband communication | US14851743 | 2015-09-11 | US09712233B1 | 2017-07-18 | Yanhua Deng; Andrew McCandless |
| A method and apparatus for cancelling interference of an interfering transmit signal. The method includes the steps of (a) transmitting an RF transmit signal from a transceiver, (b) optically modulating the RF transmit signal, (c) optically modulating a RF receive signal; (d) demodulating an optical signal back to an RF signal using an optical-electrical balanced receiver and directing to the transceiver, and (e) demodulating the optical transmit signal back to RF transmit signal. | ||||||
| 142 | Systems, devices, and methods for photonic to radio frequency downconversion | US14788785 | 2015-06-30 | US09698911B2 | 2017-07-04 | Andrew F. Schaefer; Paul T. Coyne; John C. Ceccherelli |
| A system, method, and device for RF upconversion. The system can include a laser, two EAMs, a photonic filter, a photonic service filter, two photodiodes, and a mixer. The first EAM can convert a received RF signal into the photonic domain by modulating an optical signal (received from the laser) based on the received RF signal to output a modulated optical signal. The photonic filter can output a filtered optical signal based on the modulated optical signal to the first photodiode which can output a filtered RF signal in the RF domain. The second EAM can output an LO modulated optical signal based on a received LO to the service filter which can output a filtered LO optical signal to the second photodiode which can output a filtered LO signal in the RF domain. The mixer can mix the filtered RF and LO signals to generate an IF signal. | ||||||
| 143 | Device and a method for generating an electrical signal with a suppressed frequency band | US14899951 | 2014-06-18 | US09673908B2 | 2017-06-06 | David Marpaung; Blair Morrison; Ravi Pant |
| Disclosed herein is a notch filter and a method for generating an electrical signal with a suppressed frequency band. The filter generates an optical signal by modulating a modulation optical wave with an electrical signal to generate first and second sidebands. The first sideband or the second sideband has less power than the other. The filter then modifies the optical signal by equalizing the power of light within the first side band at a selected frequency band and light within the second side band at the selected frequency band. The filter then produces an antiphase relationship between the light within the first side band at the selected frequency band and the light within the second side band at the selected frequency band. The filter then detects the modified optical signal to generate a copy of the electrical signal with suppressed frequency components within the selected frequency band. | ||||||
| 144 | Optical detector and amplifier for RF-detection having a position dependent capacitor with a displaceable membrane | US14328871 | 2014-07-11 | US09660721B2 | 2017-05-23 | Eugene Simon Polzik; Albert Schliesser; Silvan Schmid; Anders Sondberg Sorensen; Jacob M. Taylor; Koji Usami; Tolga Bagci; Anders Simonsen; Luis Guillermo Villanueva; Emil Zeuthen; Juergen Appel |
| An optical detector for detecting radio frequency (RF) signals, the optical detector comprising a light source and a photodetector, and an electrical circuit comprising a position dependent capacitor and a bias voltage source adapted for providing a bias voltage for biasing the position dependent capacitor, the position dependent capacitor comprising an electrode and a membrane being displaceable in reaction to RF signals incident on the membrane, the membrane being metallized, has a thickness of less than 1 μm and a quality factor, Qm, of at least 20,000, and the distance between the membrane and the electrode being less than 10 μm. | ||||||
| 145 | PHOTONIC RADIOFREQUENCY SIGNAL CROSS-CONNECT AND FREQUENCY CONVERSION DEVICE AND SPACE-BORNE TELECOMMUNICATIONS PAYLOAD COMPRISING SUCH A DEVICE | US15338249 | 2016-10-28 | US20170134835A1 | 2017-05-11 | Muriel AVELINE; Benoit BENAZET; Michel SOTOM |
| A photonic radiofrequency signal cross-connect and frequency conversion device comprises: electronic/optical converters, for transferring radiofrequency input signals to optical carriers; optical combiners for grouping together in one and the same optical path several optical signals generated by the electronic/optical converters; electro-optical modulators for mixing the optical signals being propagated in a same optical path with a respective radiofrequency carrier; optical splitters for splitting the optical signals at the output of the modulators; optical combiners for grouping together the optical signals deriving from different optical paths; and optical/electronic converters, associated with these optical combiners. A space-borne telecommunications payload comprising such a photonic device is also provided. | ||||||
| 146 | Tracking frequency conversion and network analyzer employing optical modulation | US14729773 | 2015-06-03 | US09634763B2 | 2017-04-25 | Bogdan Szafraniec |
| Tracking frequency conversion employs optical modulation of an optical signal to convert a radio frequency (RF) signal into an intermediate frequency (IF) output signal. A tracking frequency converter includes an optical modulator configured to receive the RF signal and to modulate the optical signal according to the received RF signal. The tracking frequency converter further includes a first square-law photodetector configured to receive the modulated optical signal and another optical signal to convert the received RF signal into the IF output signal. One or both of the modulated optical signal and the other optical signal is a tunable optical signal. | ||||||
| 147 | Optical feed network for phased array antennas | US13905895 | 2013-05-30 | US09614280B2 | 2017-04-04 | Shouyuan Shi; Jian Bai; Dennis W. Prather |
| An optical feed network for a phased-array antenna may comprise a phase-based feed network that may include electro-optical phase shifting. | ||||||
| 148 | METHODS AND APPARATUS FOR ORBITAL ANGULAR MOMENTUM (OAM) SYSTEM | US14792977 | 2015-07-07 | US20170012732A1 | 2017-01-12 | Andrew Kowalevicz; Gary M. Graceffo |
| Methods and apparatus for an OAM system having simultaneous OAM states. In embodiments, m data streams are encoded and split into n copies each of which is delayed to produce a distinct RF orbital angular momentum (OAM) mode. The delayed copies are combined using wave division multiplexing. The combined m data streams are transmitted using n antenna elements. | ||||||
| 149 | STABILIZED MICROWAVE-FREQUENCY SOURCE | US15235075 | 2016-08-11 | US20170012705A1 | 2017-01-12 | Kerry VAHALA; Scott DIDDAMS; Jiang LI; Xu YI; Hansuek LEE |
| A microwave-frequency source at frequency fM comprises: a dual optical-frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at v2 and v1 to generate sideband signals at v1±n1fM and v2±n2fM. The bandpass filter transmits sideband signals at v1+N1fM and v2−N2fM. The optical detector generates a beat note at (v2−N2fM)−(v1+N1fM). The beat note and a reference oscillator signal are processed by the circuit to generate a loop-filtered error signal to input to the VCO. Output of the VCO at fM drives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave-frequency signal. | ||||||
| 150 | Dual-frequency optical source | US14605987 | 2015-01-26 | US09537571B2 | 2017-01-03 | Jiang Li; Kerry Vahala |
| A dual-frequency optical source comprises: (a) first and second pump laser sources arranged to generate optical pump power at respective first and second pump laser frequencies vpump1 and vpump2; and (b) a fiber optical resonator characterized by a Brillouin shift frequency vB and a free spectral range that is substantially equal to an integer submultiple of the Brillouin shift frequency. Each one of the first and second pump laser sources is frequency-locked to a corresponding resonant optical mode of the fiber optical resonator. First and second optical output signals of the dual-frequency optical reference source at respective first and second output frequencies v1=vpump1−vB and v2=vpump2−vB comprise stimulated Brillouin laser output generated by simultaneous optical pumping of the fiber optical resonator by the first and second pump laser sources, respectively. An output difference frequency v2−v1 is greater than about 300 GHz. | ||||||
| 151 | SYSTEM AND METHOD FOR TEST AND/OR CALIBRATION OF MULTI-CHANNEL RF COMMUNICATION DEVICES | US15153544 | 2016-05-12 | US20160337052A1 | 2016-11-17 | Zhu Wen; Hong-Wei Kong; Ya Jing |
| A test system includes a single-channel signal generator configured to generate an autocorrelation test signal to be distributed to each of a plurality of RF channels of a device under test (DUT). A time offset network includes a plurality of time offset channels each corresponding to one of the plurality of RF channels of the DUT, and is configured to, in combination with the DUT, provide corresponding autocorrelation test signals each with a different time delay as respective RF channel test signals. A single-channel measurement instrument is configured to process a single-channel test signal, based upon a combination of the RF channel test signals, to independently measure at least one characteristic of each of the RF channels of the DUT. The time offset network may be configured to be coupled between the single-channel signal generator and the DUT. Or, the time offset network may be configured to be coupled between the DUT and the single-channel measurement instrument. | ||||||
| 152 | Discrimination of low power RF signals using phase modulation with injection locked lasers | US14693327 | 2015-04-22 | US09435839B2 | 2016-09-06 | Preetpaul S Devgan; Nicholas G Usechak |
| An apparatus is provided for RF signal discrimination. A master laser of the apparatus is connected to an optical input of an optical phase modulator. The optical phase modulator is configured to receive a plurality of RF signals at an RF input and further configured to receive an output from the master laser at an optical input. A slave laser operating below a lasing threshold is configured to receive a modulated output from the optical phase modulator. An optical filter is configured to receive a mixed signal generated inside the slave laser. A photodetector receives the filtered mixed signal and is configured to recover a RF signal from the plurality of RF signals, where a frequency of a sideband of the recovered RF signal corresponds to a mode of the slave laser. | ||||||
| 153 | REMOTE INTERFERENCE CANCELLATION FOR COMMUNICATIONS SYSTEMS | US15138898 | 2016-04-26 | US20160241354A1 | 2016-08-18 | Elias Bonaventure Kpodzo; Robert Holland; Paul Dourbal; Yanhua Deng; Paul Prucnal; Andrew McCandless |
| An interference cancellation system (ICS) may be used with a communication system to prevent or minimize interference from one or more sources. The ICS may receive radio frequency (RF) signals comprised of one or more signals of interest (SOI) and multiple interfering signals. An interference estimation processor (IEP) may be used to estimate the one or-more interfering signals. The interfering signals may be estimated using spatial and/or time diversity, which may be combined with statistical methods. The estimated interfering signals may be sent to the ICS, which may use the estimated interference signal to cancel the interference and output the SOI. | ||||||
| 154 | High performance compact RF receiver for space flight applications | US14080716 | 2013-11-14 | US09413471B2 | 2016-08-09 | Thomas W. Karras; Stephen V. Robertson; Jeffrey T. Sroga; Arthur Paolella |
| A compact photonic radio frequency receiver system includes a laser source that is configured to generate laser light Radio frequency (RF) and local oscillator (LO) input ports may receive RF and LO signals, respectively. One or more miniature lithium niobate waveguide phase modulators may be coupled to the laser source to receive the RF and LO signals and to modulate the laser light with the RF and LO signals in a first and a second path, and to generate phase-modulated laser lights including an RF-modulated light signal and an LO-modulated light signal. A first and a second miniature filter may be coupled to the miniature lithium niobate waveguide to separate a desired spectral band in the phase-modulated laser light of the first path and to facilitate wavelength locking of the laser light of the second path. An optical combiner may combine output laser lights of the first and second filters. | ||||||
| 155 | Multiple interferer cancellation for communications systems | US13899505 | 2013-05-21 | US09350398B2 | 2016-05-24 | Elias Bonaventure Kpodzo; Robert Holland; Yanhua Deng; Paul Dourbal |
| An interference cancellation system (ICS) may be used with a communication system to prevent or minimize interference from one or more sources. The ICS may receive radio RF signals comprised of one or more signals of interest (SOI) and multiple interfering signals. The ICS may use a sample of the interfering signals to cancel the interfering signals from the SOI. The multiple interfering signals may be converted into a single optical signal for cancellation. One or more optical cancellation paths may be used for interference cancellation. Each optical cancellation path may include an optical attenuator and/or an optical delay to achieve phase shifts and/or delays for interference cancellation. | ||||||
| 156 | Remote interference cancellation for communications systems | US13899529 | 2013-05-21 | US09344125B2 | 2016-05-17 | Elias Bonaventure Kpodzo; Robert Holland; Paul Dourbal; Yanhua Deng; Paul Prucnal; Andrew McCandless |
| An interference cancellation system (ICS) may be used with a communication system to prevent or minimize interference from one or more sources. The ICS may receive radio frequency (RF) signals comprised of one or more signals of interest (SOI) and multiple interfering signals. An interference estimation processor (IEP) may be used to estimate the one or more interfering signals. The interfering signals may be estimated using spatial and/or time diversity, which may be combined with statistical methods. The estimated interfering signals may be sent to the ICS, which may use the estimated interference signal to cancel the interference and output the SOI. | ||||||
| 157 | Method and apparatus for analyzing the spectrum of radio-frequency signals using unamplified fiber optic recirculation loops | US13955042 | 2013-07-31 | US09288557B2 | 2016-03-15 | Weimin Zhou |
| An apparatus for generating a frequency spectrum of an RF signal comprising a gate switch for generating a series of pulses from a laser of wavelength lambda modulated by an input RF signal, a first fiber optical loop for circulating a first percentage of a first pulse of the series of pulses from the gate switch, for a predetermined number of cycles n where each cycle takes time t1, a second fiber optical loop for conducting a second percentage of the first pulse for predetermined number of cycles “k”, where each cycle takes time t2, where t2*k=t1*n, a first switch with a first state for coupling the first pulse from the gate switch to a coupler, the coupler coupling the first pulse into the first fiber optical loop and tapping replicas of the pulse from the first fiber optical loop, and a second state for coupling the second percentage of the first pulse to the coupler to increase intensity of the tapped replica pulses, a processor for correlating the replicas of the pulse with each other to produce a set of data points comprising a plurality of multiplexed correlated pulses and transforming the data points into a channelized frequency spectrum of the input RF signal. | ||||||
| 158 | Reconfigurable liquid metal fiber optic mirror | US14027262 | 2013-09-16 | US09274271B2 | 2016-03-01 | Ross Schermer; Carl A. Villarruel; Frank Bucholtz; Colin McLaughlin |
| A true time delay system for optical signals includes a hollow core optical waveguide, a droplet of reflective liquid metal disposed in the hollow core, and an actuator coupled to a first end of the waveguide to move the droplet longitudinally within the hollow core. In one example, the waveguide is a hollow core photonic bandgap fiber. In one example, the actuator is a pressure actuator that introduces or removes gas into the core. Light enters the optical fiber, is transmitted through the fiber toward the reflective surface of the droplet, and is reflected back through the fiber and exits at the same end of the photonic bandgap optical fiber that it entered. The fiber optic device can provide a continuously-variable optical path length of over 3.6 meters (corresponding to a continuously-variable true-time delay of over 12 ns, or 120 periods at a 10 GHz modulation frequency), with negligible wavelength dependence across the C and L bands. | ||||||
| 159 | Photonic system and method for tunable beamforming of the electric field radiated by a phased array antenna | US13808996 | 2010-12-09 | US09257745B2 | 2016-02-09 | Miguel Vidal Drummond; Rogério Nunes Nogueira |
| This invention discloses a photonic system to beamform the electric field yield by a phased array antenna. The system function relies on a photonic tunable delay line, which consists on an optical Mach-Zehnder interferometer with a predefined time delay difference between arms. The time delay is tuned by adjusting the coupling ratio between the power applied to each one of the interferometer's delay lines. Three embodiments are proposed, wherein one of them just uses a single delay line and a single monochromatic light source, independently of the quantity of the array elementary antennas. | ||||||
| 160 | Isolation of RF signals using optical single side band modulation combined with optical filtering | US14223035 | 2014-03-24 | US09240842B2 | 2016-01-19 | Preetpaul S Devgan |
| A method and apparatus for isolating an RF signal are provided. A first RF signal is received and passed to an input of a 90 degree hybrid. An output of the 90 degree hybrid is connected to a first waveguide and a second output is connected to a second waveguide of an optical modulator. A second RF signal is received and passed to an input of a second 90 degree hybrid. An output of the second 90 degree hybrid is connected to the second waveguide and a second output is connected to the first waveguide of the optical modulator. The optical modulator is biased to produce single side band optical outputs of the RF signals. The single side band optical outputs are passed to an optical notch filter to remove one of the side band outputs. The other of the side band optical outputs is converted to an electrical signal. | ||||||
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