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    METHODS AND APPARATUS SUPPORTING NON-PERSISTENT COMMUNICATIONS
    1.
    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.

    DEMODULATOR WITH OPTICAL RESONATOR
    3.
    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.

    SYSTEM AND METHOD FOR DIRECTIONALLY-DEPENDENT POLARIZATION MODIFICATION
    5.
    发明申请
    SYSTEM AND METHOD FOR DIRECTIONALLY-DEPENDENT POLARIZATION MODIFICATION 有权

    公开(公告)号：US20230087573A1

    公开(公告)日：2023-03-23

    申请号：US17933766

    申请日：2022-09-20

    Applicant: Raytheon Company

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

    IPC: G02F1/09 ,  G02B6/27

    Abstract: A system includes an optical transceiver configured to transmit and receive optical signals. The optical transceiver includes a Faraday rotator and a waveplate. The Faraday rotator and the waveplate are collectively configured to provide a relative polarization change between (i) light propagating in a first direction through the Faraday rotator and the waveplate and (ii) light propagating in a second direction opposite the first direction through the Faraday rotator and the waveplate. The waveplate may include a quarter waveplate or a half waveplate.

    Methods and apparatus supporting non-persistent communications
    6.
    发明授权
    Methods and apparatus supporting non-persistent communications 有权

    公开(公告)号：US11303360B2

    公开(公告)日：2022-04-12

    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 ,  H04B10/61 ,  H04B10/572 ,  H04B10/50

    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.

    Real-time matching of target reactance in non-foster matching network
    7.
    发明授权
    Real-time matching of target reactance in non-foster matching network 有权

    公开(公告)号：US11057020B1

    公开(公告)日：2021-07-06

    申请号：US16792800

    申请日：2020-02-17

    Applicant: Raytheon Company

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

    IPC: H03H11/28 ,  H04B1/40 ,  H03F3/19

    Abstract: An apparatus includes a tunable non-Foster matching network having (i) an amplification stage with an amplifier and (ii) a reference reactance coupled in parallel with the amplifier. The non-Foster matching network is configured to provide a negative reactance based on the reference reactance. The amplification stage also includes at least one adjustable circuit element configured to adjust a gain of the amplification stage and thereby adjust the negative reactance. In some cases, the amplification stage may include a common emitter amplification stage having a transistor, and the at least one adjustable circuit element may include an adjustable capacitor and/or multiple adjustable resistors in an emitter circuit of the transistor. In other cases, the amplification stage may include an operational amplifier and multiple resistors configured to set a gain of the operational amplifier, and the at least one adjustable circuit element may include at least one of the resistors.

    NON-RETRO-REFLECTIVE IMAGING USING TILTED IMAGE PLANES
    8.
    发明申请
    NON-RETRO-REFLECTIVE IMAGING USING TILTED IMAGE PLANES 有权
    使用倾斜图像平面的非反向成像

    公开(公告)号：US20150028188A1

    公开(公告)日：2015-01-29

    申请号：US13951748

    申请日：2013-07-26

    Applicant: Raytheon Company

    Inventor： Andrew M. Kowalevicz ,  Frank Allen Birdsong, JR.

    IPC: H01L27/146

    CPC classification number: H01L27/14625 ,  G02B5/26

    Abstract: A non-retro-reflective imaging system and methods in which tilted image plane imaging is combined with selective Fourier filtering to substantially eliminate retro-reflection from the system. In certain examples, tilted image plane imaging is achieved using sliced source imaging. Through rotation of the image plane, the majority of incident light is reflected off-axis, rather than being retro-reflected. The Fourier filter is used to block incoming light from a particular angle that would otherwise be normally incident on the rotated image plane and retro-reflected. One example of a non-retro-reflective imaging system includes an optical element that focuses electromagnetic radiation onto a tilted image plane, an imaging sensor co-aligned with the tilted image plane, and a Fourier filter positioned in a Fourier plane of the optical element, a position of the Fourier filter in the Fourier plane determined by the tilt angle of the tilted image plane.

    Abstract translation: 非反光成像系统和倾斜图像平面成像与选择性傅里叶滤波组合以基本上消除来自系统的反射的方法。 在某些示例中，使用切片源成像来实现倾斜图像平面成像。 通过图像平面的旋转，大部分入射光被反射离轴，而不是被反射。 傅立叶滤波器用于阻挡来自特定角度的入射光，否则其将正常地入射到旋转的图像平面上并进行反射。 非逆反射成像系统的一个示例包括将电磁辐射聚焦到倾斜图像平面上的光学元件，与倾斜图像平面共同对准的成像传感器和位于光学元件的傅立叶平面中的傅立叶滤波器 由傅里叶平面中的傅立叶滤波器的位置由倾斜图像平面的倾斜角确定。

    Demodulation methods and devices for frequency-modulated (FM) signals
    9.
    发明授权
    Demodulation methods and devices for frequency-modulated (FM) signals 有权

    公开(公告)号：US11251783B1

    公开(公告)日：2022-02-15

    申请号：US17122872

    申请日：2020-12-15

    Applicant: Raytheon Company

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

    IPC: H03K5/00 ,  H03K5/19 ,  H03K7/06 ,  H03K5/1534

    Abstract: An apparatus includes a phase modulator configured to modulate a phase of an incoming frequency-modulated signal based on a clock signal to generate a phase-modulated signal, where the clock signal is associated with a clock frequency. The apparatus also includes an etalon configured to receive the phase-modulated signal and generate an output signal based on the phase-modulated signal. The apparatus further includes a detector configured to identify amplitudes associated with a first harmonic of the clock frequency and a first subharmonic of the clock frequency in the output signal. In addition, the apparatus includes a decoder configured to recover information encoded in the incoming frequency-modulated signal based on instantaneous frequency deviations of the incoming frequency-modulated signal, where the instantaneous frequency deviations are identified based on relative amplitudes of the first harmonic and the first subharmonic.

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