-
公开(公告)号：US20190305855A1
公开(公告)日：2019-10-03
申请号：US16367567
申请日：2019-03-28
Applicant: RAYTHEON COMPANY
Inventor： Benjamin P. Dolgin , Gary M. Graceffo , Andrew Kowalevicz
Abstract: Optical receivers and methods for balanced signal detection using an optical resonator. In one example, an optical receiver includes an optical resonator that receives an optical signal, accumulates resonant optical signal energy, and emits first output optical signal energy from a first output and second output optical signal energy from the second output. In response to a modulation of the optical signal, the optical resonator is configured to disrupt the first and second output optical signal energies to convert the modulation of the optical signal into an intensity modulation of the first and second output optical signal energies. The optical receiver includes a first detector that receives the first output optical signal energy and detects the intensity modulation of the first output optical signal energy, and a second detector that receives the second output optical signal energy and detects the intensity modulation of the second output optical signal energy.
-
102.发明申请公开(公告)号：US20190305853A1
公开(公告)日：2019-10-03
申请号：US16367574
申请日：2019-03-28
Applicant: RAYTHEON COMPANY
Inventor： Benjamin P. Dolgin , Gary M. Graceffo , Andrew Kowalevicz
IPC: H04B10/61 , H04B10/11 , H04B10/54 , H04B10/071 , G02F1/09
Abstract: Optical receivers and methods for balanced signal detection using an optical resonator. An example of an optical receiver includes a polarizing beamsplitter that receives a free-space optical signal, a first detector positioned to receive the free-space optical signal with the first polarization, an alignment system configured to rotate either the optical receiver about the optical axis or a polarization of the free-space optical signal, a faraday rotator configured to rotate the polarization of the free-space optical signal, an optical resonator that receives the free-space optical signal from the faraday rotator and accumulates resonant optical signal energy, the optical resonator configured to transmit first output optical signal energy and reject second output optical signal energy, the optical resonator being configured to convert a modulation of the free-space optical signal into an intensity modulation of the first and second output optical signal energies, a second detector that receives the first output optical signal energy and detects the intensity modulation of the first output optical signal energy, and a third detector that receives the second output optical signal energy.
-
公开(公告)号：US10378880B2
公开(公告)日：2019-08-13
申请号：US15963759
申请日：2018-04-26
Applicant: RAYTHEON COMPANY
Inventor： Benjamin P. Dolgin , Andrew Kowalevicz , Gary M. Graceffo
IPC: G01B11/06
Abstract: Methods and apparatus for measuring thickness and related properties of transparent objects, such as glass. In one example a measurement system includes a light source that produces a collimated optical beam, a modulator that modulates the collimated optical beam to produce a collimated modulated optical beam, optics configured to direct the collimated modulated optical beam to illuminate the transparent test object, and a detector sub-system that receives an intensity-modulated optical beam output from the test object and measures variations in intensity of the intensity-modulated optical beam corresponding to an intensity modulation of the intensity-modulated optical beam, the intensity-modulated optical beam being derived from interaction of the collimated modulated input optical beam with the transparent test object, the detector sub-system being further configured to produce a representation of the thickness and/or related properties of the test object based on the measured variations in intensity of the intensity-modulated optical beam.
-
公开(公告)号：US10313022B2
公开(公告)日：2019-06-04
申请号：US15717670
申请日：2017-09-27
Applicant: RAYTHEON COMPANY
Inventor： Benjamin P. Dolgin , Gary M. Graceffo , Andrew Kowalevicz
Abstract: Aspects are generally directed to receivers and methods for actively demodulating optical signals. In one example, a receiver includes an optical resonator to receive an optical signal, the optical resonator including an active optical medium interposed between first and second semi-reflective surfaces, where the active optical medium is configured to accumulate resonant optical signal energy inside the optical resonator based on the received optical signal, the second semi-reflective surface is positioned to emit output optical signal energy, and the optical resonator is configured to disturb the output optical signal energy in response to a variation in the received optical signal. The receiver may further include a detector configured to detect the disturbance in the output optical signal energy, and a pump source coupled to the active optical medium to excite the active optical medium to generate an optical gain in the received optical signal.
-
105.发明授权公开(公告)号：US10305602B2
公开(公告)日：2019-05-28
申请号：US15816047
申请日：2017-11-17
Applicant: RAYTHEON COMPANY
Inventor： Benjamin P. Dolgin , Andrew Kowalevicz , Gary M. Graceffo
IPC: H04B10/61 , G02B6/293 , H04B10/67 , H04B10/516 , G02B17/00
Abstract: Optical signal receivers and methods are provided that include multiple optical resonators, each of which receives a portion of an arriving optical signal. Various of the optical resonators are tuned or detuned from a carrier wavelength, and produce an intensity modulated output signal in response to modulation transitions in the arriving optical signal. A detector determines modulation transitions in the arriving optical signal by analyzing the intensity modulation output signals from the optical resonators.
-
Patent Agency Ranking
公开(公告)号：US10285049B2
公开(公告)日：2019-05-07
申请号：US14950552
申请日：2015-11-24
Applicant: Raytheon Company
Inventor： Andrew Kowalevicz , Gary M. Graceffo
Abstract: Communication devices and a method of providing secure electronic content are general described. Content is encrypted using a time-invariant encryption algorithm on the binary bits and a time-varying baseband key encryption waveform with a time-varying phase or amplitude. The content is recovered using a waveform with a reference phase mixed with a reference LO signal or combining the waveform and content using an XOR to measure a change of the phase/amplitude of the received signal relative to the LO signal. The key for the time-invariant binary bit level encryption may be communicated on a different channel than the content prior to communication of the content or concurrently with the content. The phase/amplitude of the baseband key may vary after baseband waveform encryption of a predetermined number of symbols, independent of the time, or after a predetermined time independent of an amount of baseband signal encrypted.
-
公开(公告)号：US10250292B2
公开(公告)日：2019-04-02
申请号：US16018159
申请日：2018-06-26
Applicant: RAYTHEON COMPANY
Inventor： Gary M. Graceffo , Andrew Kowalevicz , Benjamin P. Dolgin
Abstract: An optical receiver and communication method receives an optical signal by an optical resonator to provide an intensity modulated signal indicative of a modulation of the optical signal. The intensity modulated signal is provided to a channel receiver of a plurality of channel receivers, and the channel receiver recovers from the intensity modulated signal a multipath version of a transmitted signal embedded in the modulation of the optical signal. The channel receiver's output is combined with an output of at least one other of the plurality of channel receivers to provide a combined output signal.
-
公开(公告)号：US10243735B2
公开(公告)日：2019-03-26
申请号：US14950575
申请日：2015-11-24
Applicant: Raytheon Company
Inventor： Andrew Kowalevicz , Gary M. Graceffo
Abstract: Communication devices and a method of providing secure electronic content are general described. A plainmodulation containing user content is encrypted using a modulation key to form a ciphermodulation having a different magnitude and/or phase than the plainmodulation. Symbol representations of the plainmodulation and ciphermodulation in a QAM constellation are different. The ciphermodulation symbol representation is in a location non-coincident with an expected QAM constellation symbol. The symbol location of different plainmodulations when encypted using different modulation keys may be the same such that the corresponding ciphermodulation symbol representations are co-located. Different modulation keys are used for different plainmodulations, with a modulation key change occurring after transmission of a predetermined number of ciphermodulations and/or time. The modulation key and/or change is transmitted to enable coherent demodulation of the ciphermodulation to be performed. Multiple plainmodulations may be encrypted into a single ciphermodulation and/or a single plainmodulation may be encypted across multiple ciphermodulations.
-
公开(公告)号：US10177856B2
公开(公告)日：2019-01-08
申请号：US15679470
申请日：2017-08-17
Applicant: RAYTHEON COMPANY
Inventor： Andrew Kowalevicz , Benjamin P. Dolgin , Gary M. Graceffo
Abstract: Optical signal receivers and methods are provided that include an optical resonator that allows optical signal energy to enter and accumulate inside the optical resonator. A portion of optical signal energy is emitted from the optical resonator at an output, such that the emitted optical signal energy is disturbed when a transition occurs in the received optical signal energy. A detector aligned with the output detects the emitted optical signal energy and is configured to detect the disturbance to the emitted optical signal energy and determine a characteristic of the transition in the received optical signal energy based upon the disturbance.
-
110.发明授权公开(公告)号：US10164765B2
公开(公告)日：2018-12-25
申请号：US15892799
申请日：2018-02-09
Applicant: RAYTHEON COMPANY
Inventor： Benjamin P. Dolgin , Andrew Kowalevicz , Gary M. Graceffo
Abstract: Aspects are generally directed to optical receivers and methods for detecting a non-persistent communication superimposed on an overt communication channel. In one example, an optical receiver includes an optical resonator to receive an optical signal having one or more symbols encoded thereon at a modulated symbol repetition rate, the modulated symbol repetition rate being modulated relative to a nominal symbol repetition rate. The optical resonator is configured to emit an intensity-modulated output optical signal that has a variation in an intensity thereof corresponding to a symbol transition in the optical signal. The optical receiver further includes signal processing circuitry including a clock configured to generate a reference signal, a photodetector configured to generate a trigger signal, and a non-persistent communication decoder configured to determine a temporal misalignment between the symbol transition and the nominal symbol repetition rate based on the reference signal and the trigger signal.
-
-
-
-
-
-
-
-
-
Search Results
117
records
(took 0.026 seconds)
