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    Hyperbolic modulation offset error reducer for an RFOG
    3.
    发明授权
    Hyperbolic modulation offset error reducer for an RFOG 有权

    公开(公告)号：US10767995B2

    公开(公告)日：2020-09-08

    申请号：US16114991

    申请日：2018-08-28

    Applicant: Honeywell International Inc.

    Inventor： Lee K. Strandjord ,  Marc Smiciklas ,  Norman Gerard Tarleton ,  Glen A. Sanders

    IPC: G01C19/72

    Abstract: A hyperbolic modulation offset reducer circuit for a resonator fiber optic gyro (RFOG) is provided. The circuit includes a first demodulation circuit that is configured to demodulate a received transmission signal from a resonator at twice a sideband heterodyne detection modulation frequency to reject signals due to backscatter. A slave resonance tracking loop of the circuit is coupled to an output of the first demodulation circuit. The slave resonance tracking loop is configured to create an offset frequency signal from the transmission signal that is applied to an optical phase lock loop of a RFOG. A hyperbolic modulator offset control loop is also coupled to the output of the first demodulation circuit. The hyperbolic modulator offset control loop is configured to create a subharmonic common modulation signal from the transmission signal that is coupled to a common phase module in a silicon photonics chip of the RFOG.

    Resonant fiber optic gyroscope with hollow core fiber
    4.
    发明授权
    Resonant fiber optic gyroscope with hollow core fiber 有权

    公开(公告)号：US10598492B2

    公开(公告)日：2020-03-24

    申请号：US15635506

    申请日：2017-06-28

    Applicant: Honeywell International Inc.

    Inventor： Glen A. Sanders ,  Lee K. Strandjord

    IPC: G01C19/72 ,  G02B6/02

    Abstract: A resonant fiber optic gyroscope comprises: a ring resonator including a fiber coil fabricated from a first type of hollow core fiber; a light source to produce at least two light beams, wherein a first light beam is configured to travel in a clockwise direction in the ring resonator and a second light beam is configured to travel in a counterclockwise direction in the ring resonator; a filter resonator assembly coupled between the light source and the ring resonator including: at least two short pieces of optical fiber shorter in length than the fiber coil, the at least two short pieces of optical fiber fabricated from the first type of hollow core fiber; and wherein prior to the beams entering the ring resonator, a plurality of reflective devices are configured to condition the beams such that they excite the fundamental mode of the hollow core fiber within the ring resonator.

    APPARATUS AND METHOD FOR ENHANCED BEAT NOTE DETECTION
    5.
    发明申请
    APPARATUS AND METHOD FOR ENHANCED BEAT NOTE DETECTION 审中-公开

    公开(公告)号：US20200025568A1

    公开(公告)日：2020-01-23

    申请号：US16041205

    申请日：2018-07-20

    Applicant: Honeywell International Inc.

    Inventor： Lee K. Strandjord ,  Simon Ayotte ,  Glen A. Sanders

    IPC: G01C19/72

    Abstract: A method comprises receiving a first optical signal and a second optical signal at or near an optical resonator, where the first optical signal includes a clockwise (CW) optical signal and the second optical signal includes a counter clockwise optical signal; injecting the first optical signal and the second optical signal into a resonator loop closure optics system of the optical resonator; sampling a portion of the first optical signal and a portion of the second optical signal; combining the portion of the first optical signal and the second optical signal; converting the combined optical signals to an analog electrical signal; digitizing the analog electrical signal; storing an estimated frequency of a beat signal created by a combination of the CW optical signal and the CCW optical signal; and using the stored estimated beat signal frequency, digitally phase lock to a frequency of the beat signal.

    SYSTEMS AND METHODS FOR REDUCING POLARIZATION-RELATED BIAS ERRORS IN RFOGS
    7.
    发明申请
    SYSTEMS AND METHODS FOR REDUCING POLARIZATION-RELATED BIAS ERRORS IN RFOGS 审中-公开

    公开(公告)号：US20190041215A1

    公开(公告)日：2019-02-07

    申请号：US15668676

    申请日：2017-08-03

    Applicant: Honeywell International Inc.

    Inventor： Glen A. Sanders ,  Marc Smiciklas ,  Tiequn Qiu ,  Jianfeng Wu ,  Lee K. Strandjord

    IPC: G01C19/72 ,  G02B6/02

    CPC classification number: G01C19/727 ,  G01C19/722 ,  G01C19/726 ,  G02B6/02328 ,  G02B6/02361 ,  G02F2203/15

    Abstract: Systems and methods for reducing polarization-related bias errors in RFOGS are described herein. In certain implementations, an RFOG system includes a fiber optic resonator, one or more laser sources, wherein light from the laser sources launches first and second optical beams into the fiber optic resonator in opposite directions, and an electro-optically tunable devices in the resonator path configured to modulate the phase difference between polarization components in the first and second optical beams as the optical beams propagate within the fiber optic resonator. The system further includes at least one photodetector, wherein the polarization components of the first and second optical beams are incident on the photodetector, wherein the at least one photodetector provides an electrical signal, and at least one processing unit configured to receive the electrical signal and calculate a rotation rate for the RFOG and provide a drive signal for the electro-optically tunable device.

    Resonator fiber optic gyroscope resonance detection demodulator reference phase corrector
    9.
    发明授权
    Resonator fiber optic gyroscope resonance detection demodulator reference phase corrector 有权

    公开(公告)号：US09683846B2

    公开(公告)日：2017-06-20

    申请号：US14949552

    申请日：2015-11-23

    Applicant: Honeywell International Inc.

    Inventor： Lee K. Strandjord ,  Waymon Ho ,  Chuck Croker

    IPC: G01C19/72

    CPC classification number: G01C19/727 ,  G01C19/721 ,  G01C19/726

    Abstract: A RFOG, comprising: a master laser emitting a reference optical signal; first and second slave lasers emitting first and second optical signals; an optical resonator ring cavity coupled to the lasers, the first and second optical signals propagating in first and second directions through the optical resonator ring cavity; one or more signal generators to inject first and second modulation signals at first and second frequencies on both optical signals; first and second photodetectors that generate first and second signals; first and second demodulators to demodulate the first and second signals using first and second reference signals and the first and second frequencies; a differencing function to output the difference between resonance frequencies of the first and second signals; at least a third demodulator to detect reference phase errors; and at least one phase servo to adjust the phase of at least one of the first and second reference signals.

    Laser with transmission and reflection mode feedback control
    10.
    发明授权
    Laser with transmission and reflection mode feedback control 有权
    激光带传输和反射模式反馈控制

    公开(公告)号：US09537283B2

    公开(公告)日：2017-01-03

    申请号：US14546862

    申请日：2014-11-18

    Applicant: Honeywell International Inc.

    Inventor： Lee K. Strandjord ,  Tiequn Qiu ,  Glen A. Sanders

    IPC: H01S3/13 ,  H01S3/10 ,  G01C19/72 ,  H01S3/23 ,  H01S3/00

    CPC classification number: H01S3/1305 ,  G01C19/727 ,  H01S3/005 ,  H01S3/0085 ,  H01S3/10092 ,  H01S3/1303 ,  H01S3/1304 ,  H01S3/1307 ,  H01S3/2383 ,  H01S2301/02

    Abstract: One embodiment is directed towards a stabilized laser including a laser to produce light at a frequency and a resonator coupled to the laser such that the light from the laser circulates therethrough. The laser also includes Pound-Drever-Hall (PDH) feedback electronics configured to adjust the frequency of the light from the laser to reduce phase noise in response to light sensed at the reflection port of the resonator and transmission port feedback electronics configured to adjust the frequency of the light from the laser toward resonance of the resonator at the transmission port in response to the light sensed at the transmission port of the resonator, wherein the transmission port feedback electronics adjust the frequency at a rate at least ten times slower than the PDH feedback electronics.

    Abstract translation: 一个实施例涉及包括激光器的稳定激光器，以产生频率耦合的激光器和耦合到激光器的谐振器，使得来自激光器的光线通过其中循环。 激光器还包括Pound-Drever-Hall（PDH）反馈电子器件，其被配置为调节来自激光器的光的频率，以响应于在谐振器的反射端口处感测到的光而减少相位噪声，并且配置为调整 响应于在谐振器的传输端口处感测到的光，从激光器到发射端口的谐振器的谐振的频率，其中传输端口反馈电子器件以比PDH慢至少十倍的速率调节频率 反馈电子。

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