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    RFOG WITH OPTICAL HETERODYNING FOR OPTICAL SIGNAL DISCRIMINATION
    11.
    发明申请
    RFOG WITH OPTICAL HETERODYNING FOR OPTICAL SIGNAL DISCRIMINATION 有权
    RFOG具有光学信号辨别的光学异质性

    公开(公告)号：US20140211211A1

    公开(公告)日：2014-07-31

    申请号：US13751833

    申请日：2013-01-28

    Applicant: HONEYWELL INTERNATIONAL INC.

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

    IPC: G01C19/72

    CPC classification number: G01C19/727 ,  G01C19/723

    Abstract: In one embodiment a system including a resonator fiber-optic gyroscope configured to measure rotation rate is provided. The resonator fiber-optic gyroscope includes a sensing resonator have a first resonance frequency for a first laser beam propagation direction and a second resonance frequency for a second laser beam propagation direction, an optical mixer coupled to an output of the sensing resonator and configured to mix an output of the sensing resonator with a reference laser, wherein the optical mixer outputs a beat signal, and a resonance tracking electronics coupled to the optical mixer. The resonance tracking electronics are configured to demodulate the beat signal at a frequency offset to produce first in-phase and quadrature demodulated information, generate R-squared information from a sum of squares of the first in-phase and quadrature demodulated information, and demodulate the R-squared information at a resonance tracking modulation frequency.

    Abstract translation: 在一个实施例中，提供了一种包括被配置为测量旋转速率的谐振器光纤陀螺仪的系统。 谐振器光纤陀螺仪包括感测谐振器，其具有用于第一激光束传播方向的第一谐振频率和用于第二激光束传播方向的第二谐振频率，耦合到感测谐振器的输出并被配置为混合的光学混合器 具有参考激光器的感测谐振器的输出，其中所述光学混合器输出拍频信号，以及耦合到所述光学混合器的谐振跟踪电子装置。 共振跟踪电子设备被配置为以频率偏移解调拍频信号以产生第一同相和正交解调信息，从第一同相和正交解调信息的平方和产生R平方信息，并且解调 谐振跟踪调制频率下的R平方信息。

    BROADBAND FIBER LIGHT SOURCE WITH HIGH WAVELENGTH STABILITY UNDER RADIATION FOR IFOG APPLICATIONS
    12.
    发明申请
    BROADBAND FIBER LIGHT SOURCE WITH HIGH WAVELENGTH STABILITY UNDER RADIATION FOR IFOG APPLICATIONS 有权
    宽幅光纤光源，在IFOG应用的辐射下具有高波长稳定性

    公开(公告)号：US20140168655A1

    公开(公告)日：2014-06-19

    申请号：US13714595

    申请日：2012-12-14

    Applicant: HONEYWELL INTERNATIONAL INC.

    Inventor： Tiequn Qiu ,  Steven J. Sanders

    IPC: H01S3/067 ,  G01C19/72

    CPC classification number: H01S3/067 ,  G01C19/721 ,  H01S3/0014 ,  H01S3/06704 ,  H01S3/06795 ,  H01S3/094003 ,  H01S3/094023 ,  H01S3/094049 ,  H01S3/094053 ,  H01S3/1301 ,  H01S3/1305

    Abstract: A rare-earth-doped-fiber light source with wavelength stability includes a rare-earth doped fiber and an undoped fiber placed in proximity to each other and having the same host material and the same cross-sectional structure, a coupler configured to direct a first portion of pump power from a pump laser to the undoped fiber so the first portion of pump power was twice passed through the coupler; and a wavelength division multiplexer configured to input a second portion of pump power from the pump laser to the rare-earth doped fiber. The rare-earth doped fiber is an active medium for the broadband light source and includes a fiber core doped with rare-earth ions. The undoped fiber includes a rare-earth-dopant-free fiber core. The length of the undoped fiber is one of the same as that of the doped fiber or optimized to match a radiation sensitivity of the doped fiber.

    Abstract translation: 具有波长稳定性的稀土掺杂光纤光源包括稀土掺杂光纤和未掺杂的光纤，它们彼此靠近并且具有相同的主体材料和相同的横截面结构，耦合器被配置为引导 来自泵浦激光器的泵浦功率的第一部分到未掺杂的光纤，使得泵浦功率的第一部分两次通过耦合器; 以及波分多路复用器，其被配置为将来自所述泵浦激光器的泵浦功率的第二部分输入到所述稀土掺杂光纤。 稀土掺杂光纤是宽带光源的有源介质，包括掺杂有稀土离子的光纤芯。 未掺杂的纤维包括无稀土掺杂剂的纤维芯。 未掺杂光纤的长度与掺杂光纤的长度相同，或者被优化以匹配掺杂光纤的辐射灵敏度。

    SYSTEMS AND METHODS FOR EFFECTIVE RELATIVE INTENSITY NOISE SUBTRACTION FOR A BROADBAND RESONATOR OPTICAL GYROSCOPE
    13.
    发明申请
    SYSTEMS AND METHODS FOR EFFECTIVE RELATIVE INTENSITY NOISE SUBTRACTION FOR A BROADBAND RESONATOR OPTICAL GYROSCOPE 有权

    公开(公告)号：US20250109941A1

    公开(公告)日：2025-04-03

    申请号：US18479505

    申请日：2023-10-02

    Applicant: Honeywell International Inc.

    Inventor： Tiequn Qiu ,  Jianfeng Wu ,  Glen A. Sanders ,  Matthew Wade Puckett ,  Steven Tin

    IPC: G01C19/72 ,  G02B6/293 ,  H01S3/067

    Abstract: A method of operating a resonator optical gyroscope includes generating optical signals having broadband frequency range; coupling optical signals into optical resonator (OR) to propagate in first direction and out of OR after optical signals pass through OR in first direction; applying phase modulation to optical signals coupled out of OR to generate phase-modulated optical signals; filtering first portion of phase-modulated optical signals to generate filtered, phase-modulated optical signals; generating first electrical signals indicative of power level of the filtered, phase-modulated optical signals and RIN; coupling second portion of phase-modulated optical signals into OR to propagate in second direction and out of OR after phase-modulated optical signals pass through the OR in second direction; generating second electrical signals indicative of power level of phase-modulated optical signals after passing through OR in second direction; and determining a rotation rate based on the first electrical signals and the second electrical signals.

    RESONANT OPTICAL GYROSCOPE WITH A BROADBAND LIGHT SOURCE AND RIN REDUCTION TECHNIQUES
    14.
    发明申请
    RESONANT OPTICAL GYROSCOPE WITH A BROADBAND LIGHT SOURCE AND RIN REDUCTION TECHNIQUES 有权

    公开(公告)号：US20240377199A1

    公开(公告)日：2024-11-14

    申请号：US18316086

    申请日：2023-05-11

    Applicant: Honeywell International Inc.

    Inventor： Jianfeng Wu ,  Tiequn Qiu ,  Steven Tin ,  Glen A. Sanders ,  Matthew Wade Puckett

    IPC: G01C19/72 ,  G02B6/12

    Abstract: A gyroscope comprises a source emitting a broadband beam, and a first waveguide arrangement that splits the beam into CCW and CW beams. First and second phase modulators are coupled to the waveguide arrangement and provide phase modulations or frequency shifts to the CCW and CW beams. An optical resonator is in communication with the phase modulators such that the CCW and CW beams are optically coupled into the resonator. A second waveguide arrangement receives the CCW and CW beams transmitted from the resonator. First and second RIN detectors are coupled to the second waveguide arrangement and respectively receive the CCW and CW beams. A rate detector receives the CCW and CW beams. A rate calculation unit receives intensity noise signals from the RIN detectors, and rate and intensity noise signals from the rate detector. The rate calculation unit performs a RIN subtraction technique to reduce intensity noise limited ARW.

    REDUCING ROTATION SENSING ERRORS FROM LASER SOURCE SIGNAL AND MODULATION CROSS-TALK
    15.
    发明申请
    REDUCING ROTATION SENSING ERRORS FROM LASER SOURCE SIGNAL AND MODULATION CROSS-TALK 有权

    公开(公告)号：US20230097179A1

    公开(公告)日：2023-03-30

    申请号：US16984855

    申请日：2020-08-04

    Applicant: Honeywell International Inc.

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

    IPC: H04B10/2563

    Abstract: Systems and methods for reducing rotation sensing errors from laser source signal and modulation cross-talk are provided herein. An RFOG includes a fiber optic resonator; a first laser source that produces a first light wave at a first carrier frequency and a first cross-talked portion at a second carrier frequency wave for propagating in a first direction, wherein a second cross-talked portion propagates in a second direction that is opposite to the first direction; a second laser source that produces a second light wave for propagating in the second direction at a second carrier frequency, and having a third cross-talked portion that propagates in the first direction, a first modulator that modulates the first light wave by suppressing light at the first carrier frequency and the second cross-talked portion at the second carrier frequency, and photodetectors that generate signals from the modulated first light wave and the second light wave.

    APPARATUS AND METHODS FOR STABLE BIDIRECTIONAL OUTPUT FROM RING LASER GYROSCOPE
    16.
    发明申请
    APPARATUS AND METHODS FOR STABLE BIDIRECTIONAL OUTPUT FROM RING LASER GYROSCOPE 有权

    公开(公告)号：US20220021177A1

    公开(公告)日：2022-01-20

    申请号：US16933537

    申请日：2020-07-20

    Applicant: Honeywell International Inc.

    Inventor： Tiequn Qiu ,  Teresa Marta ,  Jianfeng Wu

    IPC: H01S3/131 ,  H01S3/094 ,  H01S3/081 ,  H01S3/13 ,  H01S3/083

    Abstract: Systems and methods for ring laser gyroscopes (RLGs) are provided. An RLG includes a traveling-wave resonator cavity with three or more mirrors and a gain medium positioned in the traveling-wave resonator cavity between two of the three or more mirrors. The gain medium is a solid-state gain medium or a nonlinear optical medium. The RLG further includes a first pump laser and a second pump laser to pump the gain medium in different directions and generate first and second lasing signals that traverse the traveling-wave resonator cavity in a opposite directions. The RLG further includes first and second photodetectors to measure levels of the first and second lasing signals. The RLG further includes at least one processor configured to adjust a power level of the first pump laser and/or a power level of the second pump laser based on the measured power levels of the first and second lasing signals.

    ETCHLESS ACOUSTIC WAVEGUIDING IN INTEGRATED ACOUSTO-OPTIC WAVEGUIDES
    17.
    发明申请
    ETCHLESS ACOUSTIC WAVEGUIDING IN INTEGRATED ACOUSTO-OPTIC WAVEGUIDES 审中-公开

    公开(公告)号：US20200096698A1

    公开(公告)日：2020-03-26

    申请号：US16357239

    申请日：2019-03-18

    Applicant: Honeywell International Inc.

    Inventor： Matthew Wade Puckett ,  Jianfeng Wu ,  Mary Salit ,  Tiequn Qiu

    IPC: G02B6/122 ,  G02F1/025 ,  G02F1/125 ,  G02F1/35 ,  G01C19/72 ,  G10K11/20

    Abstract: An acousto-optic waveguide device comprises a substrate comprising a first material having a first refractive index and a first acoustic velocity; a cladding layer over the substrate, the cladding layer comprising a second material having a second refractive index that is distinct from the first refractive index, the second material having a second acoustic velocity that is distinct from the first acoustic velocity; and an optical core surrounded by the cladding layer, the optical core comprising a third material having a third refractive index that is higher that the first refractive index and the second refractive index, the third material having a third acoustic velocity that is distinct from the first acoustic velocity and the second acoustic velocity. The cladding layer that surrounds the optical core has a thickness configured to substantially confine acoustic waves to the cladding layer when an optical signal propagates through the optical core.

    RFOG with low chromatic dispersion
    18.
    发明授权
    RFOG with low chromatic dispersion 有权

    公开(公告)号：US10101160B2

    公开(公告)日：2018-10-16

    申请号：US13937956

    申请日：2013-07-09

    Applicant: Honeywell International Inc.

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

    IPC: G01C19/72 ,  G02B6/293 ,  G02B6/02

    Abstract: One embodiment is directed towards a resonator fiber optic gyroscope (RFOG) including a resonator, one or more light sources coupled to the resonator, and resonance tracking electronics coupled to the resonator. The one or more light sources are configured to produce at least two light beams for input into the fiber coil, the at least two light beams including a first light beam at a first frequency and a second light beam at a second frequency, the first and second frequencies locked to nearby resonance modes of the resonator. The resonance tracking electronics are configured to process output light from the resonator and generate a signal therefrom, the signal indicative of a rotation rate of the resonator. The fiber coil has approximately zero total accumulated chromatic dispersion at the first frequency and the second frequency of the first light beam and the second light beam.

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