公开(公告)号：US09772187B2

公开(公告)日：2017-09-26

申请号：US15052490

申请日：2016-02-24

Applicant: Honeywell International Inc.

Inventor： Mary K. Salit ,  Jianfeng Wu ,  Tiequn Qiu

IPC: G01C19/66 ,  H01S3/067 ,  H01S3/108

CPC classification number: G01C19/661 ,  H01S3/083 ,  H01S3/30

Abstract: A ring laser gyroscope (RLG) is provided. The RLG includes a primary resonator, a secondary resonator, and an optical source to provide a pump field. The pump field in the primary resonator stimulates an optical gain curve at a first stokes wave frequency. A first order SBS field stimulates a second optical gain curve at a second stokes wave frequency. The second order SBS gain gives rise to a frequency-shifted field propagating in the first direction. The fraction of the pump field that couples out of the primary resonator, through the secondary resonator, and out of the secondary resonator is larger than the fraction of: the first order SBS field that couples out of the primary resonator, through the secondary resonator, and out of the secondary resonator; and a second order SBS field that couples out of the primary resonator, through the secondary resonator, and out of the secondary resonator.

公开(公告)号：US20170241784A1

公开(公告)日：2017-08-24

申请号：US15052490

申请日：2016-02-24

Applicant: Honeywell International Inc.

Inventor： Mary K. Salit ,  Jianfeng Wu ,  Tiequn Qiu

IPC: G01C19/66 ,  H01S3/108 ,  H01S3/067

CPC classification number: G01C19/661 ,  H01S3/083 ,  H01S3/30

Abstract: A ring laser gyroscope (RLG) is provided. The RLG includes a primary resonator, a secondary resonator, and an optical source to provide a pump field. The pump field in the primary resonator stimulates an optical gain curve at a first stokes wave frequency. A first order SBS field stimulates a second optical gain curve at a second stokes wave frequency. The second order SBS gain gives rise to a frequency-shifted field propagating in the first direction. The fraction of the pump field that couples out of the primary resonator, through the secondary resonator, and out of the secondary resonator is larger than the fraction of: the first order SBS field that couples out of the primary resonator, through the secondary resonator, and out of the secondary resonator; and a second order SBS field that couples out of the primary resonator, through the secondary resonator, and out of the secondary resonator.

公开(公告)号：US09733084B2

公开(公告)日：2017-08-15

申请号：US14882101

申请日：2015-10-13

Applicant: Honeywell International Inc.

Inventor： Mary K. Salit ,  Jianfeng Wu ,  Tiequn Qiu

IPC: G01C19/66

CPC classification number: G01C19/661 ,  G01C19/66

Abstract: A ring laser gyroscope is provided. The ring laser gyroscope includes an optical ring resonator, an optical source to provide a pump beam at a pump frequency, a beat detector, and an optical clock detector. The pump beam is coupled to the optical ring resonator in the first direction and stimulates a first optical gain curve at a first stokes wave frequency downshifted by a Brillouin stokes frequency from the pump frequency. A first order stimulated Brillouin scattering (SBS) beam propagates in the second direction and a second order SBS beam propagates in the first direction. The beat detector produces an optical beat signal that varies as a function of a frequency difference between the first order SBS beam and the second order SBS beam. The optical clock detector generates a reference frequency signal based on two co-propagating beams.

公开(公告)号：US20170067743A1

公开(公告)日：2017-03-09

申请号：US14882101

申请日：2015-10-13

Applicant: Honeywell International Inc.

Inventor： Mary K. Salit ,  Jianfeng Wu ,  Tiequn Qiu

IPC: G01C19/66

CPC classification number: G01C19/661 ,  G01C19/66

Abstract: A ring laser gyroscope is provided. The ring laser gyroscope includes an optical ring resonator, an optical source to provide a pump beam at a pump frequency, a beat detector, and an optical clock detector. The pump beam is coupled to the optical ring resonator in the first direction and stimulates a first optical gain curve at a first stokes wave frequency downshifted by a Brillouin stokes frequency from the pump frequency. A first order stimulated Brillouin scattering (SBS) beam propagates in the second direction and a second order SBS beam propagates in the first direction. The beat detector produces an optical beat signal that varies as a function of a frequency difference between the first order SBS beam and the second order SBS beam. The optical clock detector generates a reference frequency signal based on two co-propagating beams.

Abstract translation: 提供环形激光陀螺仪。 环形激光陀螺仪包括光环谐振器，提供泵浦频率的泵浦光束的光源，节拍检测器和光学时钟检测器。 泵浦光束在第一方向上耦合到光环谐振器，并且以从泵浦频率被布里渊斯托克斯频率降低的第一斯托克斯波频率刺激第一光学增益曲线。 一阶受激布里渊散射（SBS）光束在第二方向上传播，二阶SBS光束沿第一方向传播。 节拍检测器产生作为第一级SBS波束和第二级SBS波束之间的频率差的函数而变化的光学差拍信号。 光时钟检测器基于两个共同传播的波束产生参考频率信号。

公开(公告)号：US20160003619A1

公开(公告)日：2016-01-07

申请号：US14325006

申请日：2014-07-07

Applicant: Honeywell International Inc.

Inventor： Lee K. Strandjord ,  Glen A. Sanders ,  Jianfeng Wu

IPC: G01C19/72

CPC classification number: G01C19/727 ,  G01C19/721

Abstract: A resonator fiber optic gyroscope comprises a master laser device that emits a reference optical signal, a first slave laser device that emits a clockwise optical signal, and a second slave laser device that emits a counter-clockwise optical signal. A resonator ring cavity is in communication with the master laser device and the slave laser devices. A sine wave generator is coupled to the resonator ring cavity and outputs a common cavity modulation frequency comprising in-phase and quadrature signals. A laser stabilization servo receives a clockwise reflection signal that includes the common cavity modulation frequency from the resonator ring cavity. A modulation stripper coupled to the servo receives the in-phase and quadrature signals, receives a net error signal from the servo, demodulates the net error signal at the common cavity modulation frequency, and transmits a stripper signal to the servo to remove the signal at the common cavity modulation frequency.

Abstract translation: 谐振器光纤陀螺仪包括发射参考光信号的主激光装置，发射顺时针光信号的第一从激光装置和发射逆时针光信号的第二从激光装置。 谐振腔环与主激光器件和从属激光器件通信。 正弦波发生器耦合到谐振器环腔并输出包括同相和正交信号的公共调制频率。 激光稳定伺服机构接收包括来自谐振腔环的公共腔调制频率的顺时针反射信号。 耦合到伺服器的调制剥离器接收同相和正交信号，从伺服器接收净误差信号，解调公共空腔调制频率处的净误差信号，并将去耦信号发送到伺服器以去除信号 共腔调制频率。

公开(公告)号：US09097526B1

公开(公告)日：2015-08-04

申请号：US14158641

申请日：2014-01-17

Applicant: Honeywell International Inc.

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

IPC: G01C19/72 ,  G02F1/225 ,  G02F2/00

CPC classification number: G01C19/722 ,  G01C19/721 ,  G02F1/2252 ,  G02F2/00

Abstract: Systems and methods for a polarization matched resonator fiber optic gyroscope are provided. In one embodiment an RFOG comprises: a light source; a fiber optic ring resonator; a photodetector that outputs an electrical signal that varies as a function of optical intensity; and an input light polarization servo. A light beam from the servo is launched into the resonator ring in a first direction of circulation. The input polarization servo comprises a birefringence modulator that modulates a phase shift between two components of an input polarization state of the light beam at ωm, the modulator is controlled to drive towards zero a 1st harmonic of ωm as measured in the electrical signal. The servo further comprises a tunable ½ waveplate that adjusts an amplitude of the two components of the input polarization state relative to each other. The tunable ½ waveplate is controlled to maximize a peak optical intensity as measured in the electrical signal.

Abstract translation: 提供了一种用于偏振匹配谐振器光纤陀螺仪的系统和方法。 在一个实施例中，RFOG包括：光源; 光纤环谐振器; 输出根据光强度变化的电信号的光电检测器; 和输入光偏振伺服。 来自伺服器的光束沿着第一循环方向发射到谐振器环中。 输入偏振伺服包括双折射调制器，其在ωm处调制光束的输入偏振状态的两个分量之间的相移，调制器被控制为在电信号中测得的ωm的第一谐波为零。 伺服还包括可调谐的1/2波片，其调节输入偏振状态的两个分量相对于彼此的振幅。 可调谐的1/2波片被控制以使在电信号中测得的峰值光强度最大化。

公开(公告)号：US20150098088A1

公开(公告)日：2015-04-09

申请号：US14047855

申请日：2013-10-07

Applicant: Honeywell International Inc.

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

IPC: G01C19/66

CPC classification number: G01C19/661 ,  G01C19/727

Abstract: A resonator fiber optic gyroscope is provided. The resonator fiber optic gyroscope includes a gyroscope resonator, a laser; a clockwise modulator; a clockwise circulator; a clockwise reflection detector; a first-lock-in-amplifier, a clockwise-resonance-tracking servo to receive output from the first-lock-in-amplifier and to provide feedback to the laser to lock the laser to the gyroscope resonator; a clockwise transmission detector to detect an optical beam output from the counter-clockwise input port; a second servo; a second-lock-in-amplifier; and a third-lock-in-amplifier. The first and second lock-in-amplifiers demodulate at the first harmonic of the modulation frequency. The second-lock-in-amplifier demodulates at the second harmonic of the modulation frequency. Either the modulation frequency of the clockwise optical beam is locked to (n+0.5) times the FSR through the second servo, where n is zero or a positive integer, or the FSR is locked to 1/(n+0.5) times the modulation frequency of the clockwise optical beam through the second servo.

Abstract translation: 提供了一种谐振器光纤陀螺仪。 谐振器光纤陀螺仪包括陀螺仪谐振器，激光器; 顺时针调制器 顺时针循环器 顺时针反射检测器; 第一锁定放大器，顺时针谐振跟踪伺服器，用于接收来自第一锁定放大器的输出，并向激光器提供反馈以将激光器锁定到陀螺仪谐振器; 用于检测从逆时针输入端口输出的光束的顺时针传输检测器; 第二伺服; 第二锁定放大器; 和第三锁定放大器。 第一和第二锁相放大器在调制频率的一次谐波处解调。 第二锁定放大器在调制频率的二次谐波处解调。 顺时针光束的调制频率通过第二伺服锁定到FSR的（n + 0.5）倍，其中n为零或正整数，或者FSR被锁定到调制的1 /（n + 0.5）倍 顺时针光束通过第二伺服的频率。

公开(公告)号：US20250027772A1

公开(公告)日：2025-01-23

申请号：US18356768

申请日：2023-07-21

Applicant: Honeywell International Inc.

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

IPC: G01C19/72

Abstract: Embodiments utilize an optical frequency comb generator coupled to an optical resonator of an optical gyroscope. The optical frequency comb generator generates an optical frequency comb having frequency peaks that each correspond to a respective resonance frequency of the optical resonator. A control servo can be coupled to the optical frequency comb generator and controls the optical frequency comb output from the optical frequency comb generator. In doing so, the optical frequency comb remains tuned to the resonance frequencies of the optical resonator during gyroscope operation.

公开(公告)号：US20240369766A1

公开(公告)日：2024-11-07

申请号：US18778036

申请日：2024-07-19

Applicant: Honeywell International Inc.

Inventor： Matthew Wade Puckett ,  Chad Hoyt ,  Karl D. Nelson ,  Jianfeng Wu

IPC: G02B6/125 ,  G02B6/12 ,  G02B6/122 ,  G02B6/124 ,  G02B6/28

Abstract: Techniques are provided for implementing a low insertion loss optical coupler utilizing a low confinement planar optical waveguide and two high confinement planar optical waveguides. The optical coupler efficiently couples an optical signal with a cross section greater than either high confinement planar optical waveguide.

公开(公告)号：US20240328783A1

公开(公告)日：2024-10-03

申请号：US18193448

申请日：2023-03-30

Applicant: Honeywell International Inc.

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

IPC: G01C19/72 ,  H01S3/00

CPC classification number: G01C19/727 ,  G01C19/722 ,  H01S3/0071

Abstract: A photonics gyroscope comprises a light source on a photonics chip that emits a broadband beam; a waveguide resonator; a reflective component; first and second detectors, the second detector coupled to the source; a RIN servo loop coupled between the second detector and the source; and a rate calculation unit. The beam is directed into the resonator such that it propagates in a CCW direction. A portion of the CCW beam is coupled out of the resonator toward the reflective component and reflected back as a reflected beam that is coupled into the resonator such that the reflected beam propagates in a CW direction. The CW beam is coupled out of the resonator to the first detector, which detects a resonance frequency shift between the CW and CCW beams. The RIN servo loop stabilizes an intensity of the beam such that bias error and noise is reduced.