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1. 发明申请

WO2012075474A2 DFB FIBER LASER BEND SENSOR AND OPTICAL HETERODYNE MICROPHONE 审中-公开
标题翻译： DFB光纤激光弯曲传感器和光学异形麦克风
公开(公告)号：WO2012075474A2
公开(公告)日：2012-06-07
申请号：PCT/US2011/063194
申请日：2011-12-02
申请人： OFS FITEL, LLC , ABEDIN, Kazi, S. , WESTBROOK, Paul, S.
发明人： ABEDIN, Kazi, S. , WESTBROOK, Paul, S.
IPC分类号： G01N21/75
CPC分类号： G01D5/268 , G01D5/35316 , G01D5/3537 , G01D5/3538 , G01H9/004 , G01J1/0425 , G01L1/243 , G01L1/246 , G01L11/025 , G01N2021/7716 , H04R23/008
摘要： Methods and systems using one or more distributed feedback (DFB) lasers for capturing changes in the lasing environment are disclosed, Specifically, a sensor for measuring a measurand, such as pressure or temperature, or changes in a measurand, includes a fiber with at least one core, at least one fiber laser cavity formed by a single fiber grating in the core, wherein the laser operates on at least two modes along at least part of its length. The DFB laser includes a section that is bent into a non-linear shape and at least one pump laser connected to the fiber laser cavity. When the DFB laser experiences a perturbation or measurand change that changes the spacing of the modes, a change in an RF beat note is generated. This beat note can then be measured and related to the measurand change.
摘要翻译：公开了使用一个或多个用于捕获激光环境中的变化的分布反馈（DFB）激光器的方法和系统。具体地，用于测量被测量的传感器，例如压力或温度，或被测量的变化，包括具有至少一个核心，至少一个光纤激光器腔，其由芯中的单个光纤光栅形成，其中所述激光器沿其长度的至少一部分沿至少两个模式工作。 DFB激光器包括弯曲成非线性形状的部分和连接到光纤激光腔的至少一个泵激光器。当DFB激光器经历改变模式间隔的扰动或被测量的变化时，产生RF拍音的变化。然后可以测量这个拍音，并与被测量的变化相关。

2. 发明申请

WO2012149068A1 RAMAN DISTRIBUTED FEEDBACK FIBER LASER AND HIGH POWER LASER SYSTEM USING THE SAME 审中-公开
标题翻译：拉曼分布式反馈光纤激光器和使用该激光器的高功率激光系统
公开(公告)号：WO2012149068A1
公开(公告)日：2012-11-01
申请号：PCT/US2012/035065
申请日：2012-04-25
申请人： OFS FITEL, LLC , ABEDIN, Kazi, S. , KREMP, Tristan , PORQUE, Jerome, C. , NICHOLSON, Jeffrey, W. , WESTBROOK, Paul, S.
发明人： ABEDIN, Kazi, S. , KREMP, Tristan , PORQUE, Jerome, C. , NICHOLSON, Jeffrey, W. , WESTBROOK, Paul, S.
IPC分类号： H01S3/30
CPC分类号： H01S3/302 , H01S3/0014 , H01S3/06712 , H01S3/0675 , H01S3/07 , H01S3/08022 , H01S3/0826 , H01S3/094003 , H01S3/094042 , H01S3/094046 , H01S3/1086
摘要： A Raman distributed feedback (DFB) fiber laser is disclosed. It includes a pump source and a Raman gain fiber of a length smaller than 20 cm containing a distributed feedback (DFB) grating with a discrete phase structure located within no more than 10 % off the center of the grating and wherein the Raman DFB fiber laser generates a laser signal with an optical spectrum, which has an optical bandwidth at half maximum optical intensity of less than 1 gigahertz (GHz) (wherein a maximum intensity frequency is different from the frequency of the pump laser). The Raman laser includes compensation for the nonlinear phase change due to Kerr effect and thermal effect resulting from absorption of the optical field, thus enhancing the conversion efficiency.
摘要翻译：公开了一种拉曼分布反馈（DFB）光纤激光器。它包括长度小于20厘米的泵浦源和拉曼增益光纤，其包含分布反馈（DFB）光栅，离散相位结构位于离光栅中心不超过10％的范围内，其中拉曼DFB光纤激光器产生具有小于1千兆赫兹（GHz）的最大光强度的光学带宽（其中最大强度频率与泵浦激光器的频率不同）的光谱的激光信号。拉曼激光器包括由于克尔效应引起的非线性相位变化和由光场吸收产生的热效应的补偿，从而提高转换效率。

3. 发明申请

WO2013020121A1 IN-LINE ARRANGEMENT FOR MEASURING POLARIZATION EXTINCTION RATIO 审中-公开
标题翻译：用于测量极化放电比例的在线布置
公开(公告)号：WO2013020121A1
公开(公告)日：2013-02-07
申请号：PCT/US2012/049662
申请日：2012-08-03
申请人： OFS FITEL, LLC , MIKHAILOV, Vitaly , WESTBROOK, Paul, S.
发明人： MIKHAILOV, Vitaly , WESTBROOK, Paul, S.
IPC分类号： G01J4/04
CPC分类号： G01J4/04 , G01J1/0425 , G01M11/337 , G01M11/35 , G02B6/02076 , G02B6/024
摘要： An in-line polarization extinction ratio (PER) monitor that generates a value of an optical signal's PER from a single measurement, without requiring the optical transmission signal path of the system to be directly coupled into a separate measurement device. The polarization extinction ratio may be defined as: 1010g(P Ex /P Ey ), where P Ex is the power of the optical signal propagating along the "x axis" and P Ey is the power propagating along the orthogonal "y axis" (with the z-axis defined as a longitudinal optical axis of the system and the x-y plane orthogonal to this direction of propagation). The PER monitor comprises a section of optical fiber (preferably birefringent or with induced birefringency), with a pair of gratings formed along the fiber and oriented to out-couple orthogonal components of the propagating signal. Photodetectors are used to convert the scattered light into electrical signal equivalents and then processed to yield the PER value.
摘要翻译：线性偏振消光比（PER）监视器，其从单个测量产生光信号的PER值，而不需要将系统的光传输信号路径直接耦合到单独的测量装置中。偏振消光比可以定义为：1010g（PEx / PEy），其中PEx是沿着“x轴”传播的光信号的功率，而PEy是沿着正交“y轴”传播的功率（z- 轴定义为系统的纵向光轴和与该传播方向正交的xy平面）。 PER监测器包括一段光纤（优选双折射或具有诱导双折射），一对光栅沿着光纤形成并且定向成输出传播信号的正交分量。光检测器用于将散射光转换为电信号等效物，然后进行处理以产生PER值。

4. 发明申请

WO2012154703A1 METHODS AND SYSTEMS FOR BULK DISPERSION MONITORING 审中-公开
标题翻译：用于大容量分散监测的方法和系统
公开(公告)号：WO2012154703A1
公开(公告)日：2012-11-15
申请号：PCT/US2012/036856
申请日：2012-05-07
申请人： OFS FITEL, LLC , MIKHAILOV, Vitaly , WESTBROOK, Paul, S.
发明人： MIKHAILOV, Vitaly , WESTBROOK, Paul, S.
IPC分类号： H04B10/12
CPC分类号： H04B10/07951 , H04B10/0775 , H04B2210/07
摘要： A method and system for measuring chromatic dispersion, experienced by ASK/PSK modulated optical signals, are provided. Dispersion measurement is enabled either by encoding an additional overhead at lower baud rate or by monitoring signal SOP or RF spectrum of signal SOP. The bulk chromatic dispersion of the link is measured by analyzing the dispersion broadening of the overhead constellation or signal temporal diagram, or time-overlapped signal diagram, or overhead spectrum. This information is used to reduce the computation time required for electronic recovery of a highly dispersed signal.
摘要翻译：提供了用于测量由ASK / PSK调制的光信号所经历的色散的方法和系统。通过以较低波特率编码附加开销或通过监视信号SOP的信号SOP或RF频谱来启用色散测量。通过分析开销星座或信号时间图或时间重叠信号图或架空频谱的色散扩展来测量链路的体色散。该信息用于减少电子恢复高分散信号所需的计算时间。

5. 发明申请

WO2022169902A1 THERMALLY ANNEALED GRATINGS IN COATED FIBER AND RELATED SYSTEMS AND METHODS 审中-公开
公开(公告)号：WO2022169902A1
公开(公告)日：2022-08-11
申请号：PCT/US2022/014982
申请日：2022-02-02
申请人： OFS FITEL, LLC
发明人： DYER, Robert, S , HOKANSSON, Adam , POPELKA, Matthew , SAVRAN, Brian , WESTBROOK, Paul, S. , SOUNDARA, Vixay, R. , STOLOV, Andrei, A.
IPC分类号： G02B6/02 , C03B37/029 , C03C25/10 , C03C25/42 , C03C25/62 , G02B6/036
摘要： Described herein are systems, methods, and articles of manufacture for a coated fiber modified by actinic radiation to increase back-scattering, which experiences very little back scattering decay at a temperature and time of exposure that is sufficient to noticeably degrade the coating and/or noticeably degrade the optical fiber due to outgassing of hydrogen from the coating, wherein an optical fiber comprises a fiber length, a coating having a treated coating weight, wherein the treated coating weight is at least 25% less of an original coating weight prior to an annealing treatment, and an optical back-scatter along the fiber length greater than a Rayleigh back-scattering over the fiber length, wherein the optical back-scatter does not decrease along the fiber length by more than 3 dB after exposure to annealing treatment.

6. 发明申请

WO2021183846A1 SYSTEM FOR MEASURING MICROBENDS AND ARBITRARY MICRO-DEFORMATIONS ALONG A THREE-DIMENSIONAL SPACE 审中-公开
公开(公告)号：WO2021183846A1
公开(公告)日：2021-09-16
申请号：PCT/US2021/022051
申请日：2021-03-15
申请人： OFS FITEL, LLC
发明人： AHMAD, Raja, A. , WESTBROOK, Paul, S.
IPC分类号： G01B9/02 , G01B11/16 , G01C3/08 , G01L1/24 , G01N21/00
摘要： A system for sensing microbends and micro-deformations in three- dimensional space is based upon a distributed length optical fiber formed to include a group of offset cores disposed in a spiral configuration along the length of the fiber, each core including a fiber Bragg grating that exhibits the same Bragg wavelength. A micro-scale local deformation of the multicore fiber produces a local shift in the Bragg wavelength, where the use of multiple cores allows for a complete micro-scale modeling of the local deformation. Sequential probing of each core allows for optical frequency domain reflectometry (OFDR) allows for reconstruction of a given three-dimensional shape, delineating location and size of various microbends and micro-deformations.

7. 发明申请

WO2019140144A1 OPTICAL PROBE USING MULTIMODE OPTICAL WAVEGUIDE AND PROXIMAL PROCESSING 审中-公开
公开(公告)号：WO2019140144A1
公开(公告)日：2019-07-18
申请号：PCT/US2019/013123
申请日：2019-01-11
申请人： OFS FITEL, LLC
发明人： DIGIOVANNI, David, J. , KREMP, Tristan , SWANSON, Eric , WESTBROOK, Paul, S.
IPC分类号： G01N21/17 , G02B6/00 , G02B6/10 , G01J3/02
摘要： An optical source that generates an optical beam that propagates from a proximal end to a distal end of an optical fiber that imparts a transformation of a spatial profile of the optical beam. An optical control device imparts a compensating spatial profile on the optical beam in response to a control signal from a signal processor. A distal optical source generates a calibration light that propagates through the one or more optical waveguides from the distal end to the proximal end of the optical fiber. An optical detector detects the calibration light and generates electrical signals in response to the detected calibration light the signal processor generates the control signal to instruct the optical control device to impart the compensating spatial profile on the optical beam that at least partially compensates for the transformation of the spatial profile of the optical beam imparted by the optical fiber.

8. 发明申请

WO2023091250A1 ENHANCED BACK-SCATTERING FIBER-OPTIC NETWORKS 审中-公开
公开(公告)号：WO2023091250A1
公开(公告)日：2023-05-25
申请号：PCT/US2022/046353
申请日：2022-10-12
申请人： OFS FITEL, LLC
发明人： FEDER, Kenneth, S. , KREMP, Tristan , WESTBROOK, Paul, S.
IPC分类号： H04B10/29 , H04B7/24 , G02B6/00
摘要： A system comprising an enhanced back- scattering region, which is confined to a limited enhanced scattering bandwidth (e.g., approximately ten decibel (lOdB) scattering bandwidth over approximately fifteen nanometer (15nm) wavelength range in the C-Band (Conventional Band)). A signal transmission wavelength (or telecom signal wavelength) carries an optical signal at a wavelength that is at least one nanometer (Inm) outside of the enhanced scattering bandwidth.

9. 发明申请

WO2021142452A1 HIGH-TEMPERATURE HYDROGEN-RESISTANT SCATTERING ENHANCEMENT IN OPTICAL FIBER 审中-公开
公开(公告)号：WO2021142452A1
公开(公告)日：2021-07-15
申请号：PCT/US2021/012985
申请日：2021-01-11
申请人： OFS FITEL, LLC
发明人： STOLOV, Andrei, A. , WESTBROOK, Paul, S.
IPC分类号： G01N21/17
摘要： Described herein are systems, methods, and articles of manufacture for a spatially nonuniform scattering profile along its length, whose backscattering signal can be used for sensing even after fiber attenuation increases due to the conditions in the sensing environment. In one embodiment, the fiber has been pre-exposed to the conditions that produce attenuation, and the spatially nonuniform profile compensates for this. Subsequent exposure then results in very little or at least acceptable levels of additional attenuation. An exemplary fiber comprises a fiber length and an optical back scatter along the fiber length greater than a Rayleigh back scattering over the fiber length, wherein the optical back scatter does not decrease along the fiber length by more than 3 dB after exposure to a hydrogen-rich first environment having a given pressure and temperature.

10. 发明申请

WO2021034830A1 OPTICAL FIBER AMPLIFIER WITH DISTRIBUTED GAIN FLATTENING 审中-公开
公开(公告)号：WO2021034830A1
公开(公告)日：2021-02-25
申请号：PCT/US2020/046805
申请日：2020-08-18
申请人： OFS FITEL, LLC
发明人： DIGIOVANNI, David, J. , WESTBROOK, Paul, S. , ZHU, Benyuan
IPC分类号： H01S3/067
摘要： An optical fiber amplifier is formed to include a grating structure inscribed within the rare earth-doped gain fiber itself, providing distributed wavelength- dependent filtering (attenuation) and minimizing the need for any type of gain- flattening filter to be used at the output of the amplifier. The grating structure may be of any suitable arrangement that provides the desired loss spectrum, for example, similar to the profile of a prior art discrete GFF. Various types of grating structures that may be used to provide distributed wavelength-dependent filtering along the gain include, but are not limited to, tilted gratings, weak Bragg gratings, long-period grating (LPG), and any suitable combination of these grating structures.

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