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    Method for non-line-of-sight detection of complex optical signals
    21.
    发明授权
    Method for non-line-of-sight detection of complex optical signals 有权

    公开(公告)号：US11728901B2

    公开(公告)日：2023-08-15

    申请号：US17717763

    申请日：2022-04-11

    Applicant: RAYTHEON COMPANY

    Inventor： Andrew Kowalevicz ,  Benjamin P. Dolgin ,  Gary M. Graceffo ,  Jae H. Kyung ,  Maurice J. Halmos

    IPC: H04B10/69

    CPC classification number: H04B10/6911

    Abstract: Optical signal receivers, systems, and methods of operating the same include a non-line of sight optical signal receiver configured to receive and detect a complex modulated optical signal through a non-line of site propagation path from an optical transmitter, comprising an optical resonator configured to receive the complex modulated optical signal through the non-line of sight propagation path, and to convert the complex modulated optical signal to an intensity modulated signal, and a detector configured to convert the intensity modulated signal into an electrical signal, the electrical signal having an amplitude indicative of an intensity of the intensity modulated signal from the optical resonator, and to provide a detected signal.

    BASEBAND DATA REDUCTION AND COMPRESSION ALGORITHM
    23.
    发明申请
    BASEBAND DATA REDUCTION AND COMPRESSION ALGORITHM 有权

    公开(公告)号：US20230033568A1

    公开(公告)日：2023-02-02

    申请号：US17380772

    申请日：2021-07-20

    Applicant: RAYTHEON COMPANY

    Inventor： Gary M. Graceffo ,  Andrew Kowalevicz ,  Benjamin P. Dolgin

    IPC: H04L25/49 ,  H04L27/00

    Abstract: A system and method for recovering encoded data from a modulated baseband signal is disclosed. Aspects and embodiments of the system and method include receiving an analog input signal representing a modulated baseband signal, counting clock cycles of a reference clock, detecting a first transition and a second transition of the analog input signal indicating a first change and a second change in the modulated baseband signal, storing a first counter value corresponding to an amount of clock cycles elapsed between the first transition and the second transition, and determining a binary-valued bit sequence corresponding to the first counter value.

    METHODS AND APPARATUS SUPPORTING NON-PERSISTENT COMMUNICATIONS
    25.
    发明申请
    METHODS AND APPARATUS SUPPORTING NON-PERSISTENT COMMUNICATIONS 有权

    公开(公告)号：US20210399807A1

    公开(公告)日：2021-12-23

    申请号：US16908558

    申请日：2020-06-22

    Applicant: Raytheon Company

    Inventor： Benjamin P. Dolgin ,  Andrew M. Kowalevicz ,  Gary M. Graceffo

    IPC: H04B10/532 ,  G02B6/27 ,  H04B10/50 ,  H04B10/572 ,  H04B10/61

    Abstract: An optical transmitter (and methods of transmitting and receiving) includes a delay and modulation circuit configured to receive at least one optical beam and a first data signal (persistent data) and generate at least two or more modulated optical beams having the first data encoded therein. One of the modulated optical beams is a time-delayed or time-shifted version of another one of the modulated optical beams, and both beams are directed toward a target. The amount or time delay between the first and second optical beams can be modulated according to a second data signal (non-persistent data) to encode the second data therein. An optical receiver is configured to detect the two modulated optical beams and recover the first data. Because changes in the amount or time delays between the first and second optical beams results in a positional change in the location of the combined centroid of the received beams at a detector of the receiver, the second data can be recovered by detecting the positional changes.

    METHODS AND APPARATUS FOR RECEPTION OF LOW PHOTON DENSITY OPTICAL SIGNALS
    28.
    发明申请
    METHODS AND APPARATUS FOR RECEPTION OF LOW PHOTON DENSITY OPTICAL SIGNALS 有权

    公开(公告)号：US20210099234A1

    公开(公告)日：2021-04-01

    申请号：US17035187

    申请日：2020-09-28

    Applicant: RAYTHEON COMPANY

    Inventor： Gary M. Graceffo ,  Andrew Kowalevicz ,  Benjamin P. Dolgin

    IPC: H04B10/60 ,  G02B17/00 ,  G02F1/137

    Abstract: An optical receiver includes a photonic integrator configured to accumulate optical signal energy corresponding to the input optical signal during an integration period, and to produce an output optical signal at an end of the integration period, the output optical signal having a higher intensity than the input optical signal, a shutter operable between a closed position and an open position, the shutter configured to prevent the output optical signal from exiting the photonic integrator when in the closed position and to allow the output optical signal to exit the photonic integrator when in the open position, a synchronizer coupled to the shutter and configured to control the shutter between the open position and the closed position; and a photodetector configured to receive the output optical signal when the shutter is in the open position and to produce an electrical signal corresponding to the output optical signal.

    METHODS AND APPARATUS FOR PHASE CHANGE DETECTION USING A RESONATOR
    29.
    发明申请
    METHODS AND APPARATUS FOR PHASE CHANGE DETECTION USING A RESONATOR 有权

    公开(公告)号：US20210021449A1

    公开(公告)日：2021-01-21

    申请号：US16929916

    申请日：2020-07-15

    Applicant: RAYTHEON COMPANY

    Inventor： Gary M. Graceffo ,  Andrew Kowalevicz ,  Benjamin P. Dolgin

    IPC: H04L27/22 ,  H01P7/06 ,  H03H7/00

    Abstract: Disclosed is a microwave cavity resonator used as a phase change (phase modulation) to intensity change (intensity or amplitude modulation) converter. Certain aspects and embodiments include resonant circuits, such as a resistor, inductor and capacitor (RLC) circuit. Certain aspects and embodiments convert changes in phase to changes in output voltage to perform analog demodulation of a phase modulated microwave carrier. Certain aspects and embodiments use resonance when the reactive components of the circuit (capacitive and inductive components) are equal in magnitude and 180 degrees out of phase with one another, thereby cancelling out the reactance component of the circuit's impedance.

    DEMODULATOR WITH OPTICAL RESONATOR
    30.
    发明申请
    DEMODULATOR WITH OPTICAL RESONATOR 有权

    公开(公告)号：US20210018817A1

    公开(公告)日：2021-01-21

    申请号：US16903129

    申请日：2020-06-16

    Applicant: Raytheon Company

    Inventor： Andrew M. Kowalevicz ,  Benjamin P. Dolgin ,  Gary M. Graceffo

    IPC: G02F2/00 ,  H04B10/67 ,  H04B10/556

    Abstract: A demodulator can include an optical resonator. The optical resonator can include a resonant cavity that extends between a first surface that is partially reflective and a second surface that is at least partially reflective. The first surface can receive a phase-modulated optical signal that has a time-varying phase. The resonant cavity can accumulate resonant optical signal energy based at least in part on the phase-modulated optical signal. The first surface can direct a fraction of the resonant optical signal energy out of the optical resonator to form an intensity-modulated optical signal that has a time-varying intensity. A data detector can receive at least a portion of the intensity-modulated optical signal and, in response, generate an intensity-modulated electrical signal that has a time-varying intensity that corresponds to the time-varying phase of the phase-modulated optical signal.

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