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1. 发明授权

US06993257B2 Optical channel monitor utilizing multiple Fabry-Perot filter pass-bands 有权
标题翻译：使用多个法布里 - 珀罗滤波器通带的光通道监视器
公开(公告)号：US06993257B2
公开(公告)日：2006-01-31
申请号：US09929339
申请日：2001-08-15
申请人： Bryan L. Althouse , Gregg A. Johnson
发明人： Bryan L. Althouse , Gregg A. Johnson
IPC分类号： H04B10/08
CPC分类号： H04B10/07955 , H04B10/077
摘要： An optical channel monitor is described, the optical channel monitor includes an optical input port, a photodetector disposed in an optical path communicating at least intermittently with the optical input port, an optical filter disposed in the optical path between the optical input port and the photodetector, and an optical band splitter disposed in the optical path between the optical filter and the photodetector. The optical filter is a multibandpass filter, such as a scanning Fabry-Perot filter. The optical channel monitor also comprises a reference light system for providing a calibration standard against which an optical signal input through the input port may be compared. The channel monitor finds application in optical transmission systems including wavelength division multiplexed (WDM) optical communication systems.
摘要翻译：描述光通道监视器，光通道监视器包括光输入端口，设置在至少间歇地与光输入端口通信的光路中的光电检测器，设置在光输入端口和光电检测器之间的光路中的滤光器以及设置在光学滤波器和光电检测器之间的光路中的光学分束器。光滤波器是多波束通滤波器，例如扫描法布里 - 珀罗滤波器。光通道监视器还包括用于提供校准标准的参考光系统，通过输入端口输入的光信号可与其对比。信道监视器在包括波分复用（WDM）光通信系统的光传输系统中得到应用。

2. 发明授权

US06674928B2 Optical sensing device containing fiber Bragg gratings 失效
标题翻译：包含光纤布拉格光栅的光学感测装置
公开(公告)号：US06674928B2
公开(公告)日：2004-01-06
申请号：US09917643
申请日：2001-07-31
申请人： Gregg A. Johnson , Michael D. Todd , Bryan L. Althouse , Chia-Chen Chang
发明人： Gregg A. Johnson , Michael D. Todd , Bryan L. Althouse , Chia-Chen Chang
IPC分类号： G02B600
CPC分类号： G01L1/243 , G01D5/35383 , G01K11/3206 , G01L1/246
摘要： A new optical sensing device containing fiber Bragg gratings, a scanning bandpass filter, an interferometer and multiple photodetectors is disclosed. The present invention also describes a new system and method for fibre Bragg grating (FBG) sensor interrogation and multiplexing. The new system combines a scanning Fabry-Perot (SFP) bandpass filter used to wavelength-multiplex multiple gratings in a single fiber, and an unbalanced Mach-Zehnder fibre interferometer made with a 3×3 coupler to detect strain-induced wavelength shifts. A passive technique for interferometer drift compensation using non-sensing FBGs is included in the system. A complete prototype system interrogates four gratings in a single fiber at a Nyquist sampling rate up to 10 kHz, with a noise floor measured near 4 n&egr; Hz−1/2 above 0.1 Hz. The inclusion of the interferometer drift compensation technique is shown to make quasi-static measurements feasible.
摘要翻译：公开了一种包含光纤布拉格光栅，扫描带通滤波器，干涉仪和多个光电探测器的新型光学感测装置。本发明还描述了用于光纤布拉格光栅（FBG）传感器询问和复用的新系统和方法。新系统结合了用于在单个光纤中波长复用多个光栅的扫描法布里 - 珀罗（SFP）带通滤波器和用3x3耦合器制成的不平衡马赫 - 曾德尔光纤干涉仪，以检测应变诱发的波长漂移。系统中包含使用非感应FBG的干涉仪漂移补偿的被动技术。完整的原型系统以高达10 kHz的奈奎斯特采样率在单根光纤中询问四个光栅，噪声基底在0.1赫兹附近测得。显示了包含干涉仪漂移补偿技术，使准静态测量成为可能。

3. 发明授权

US06744035B2 Passive, temperature compensated techniques for tunable filter calibration in bragg-grating interrogation systems 失效
标题翻译：被动温度补偿技术，用于布拉格光栅询问系统中的可调谐滤波器校准
公开(公告)号：US06744035B2
公开(公告)日：2004-06-01
申请号：US10346069
申请日：2003-01-17
申请人： Gregg A. Johnson , Bryan L. Althouse , Greg Nau , Sandeep T. Vohra
发明人： Gregg A. Johnson , Bryan L. Althouse , Greg Nau , Sandeep T. Vohra
IPC分类号： G01B902
CPC分类号： G01K11/3206 , G02B6/0218 , G02B6/02204 , G02B6/29319 , G02B6/29395 , G02B6/29398 , H04B10/07
摘要： A passive, temperature compensated tunable filter calibration device in a Bragg-grating interrogation system. The invention comprises two systems: 1) a dual substrate Bragg grating calibration system, the temperature of an array of gratings is estimated using an array of gratings bonded to a common host substrate and a single grating bonded to a material with a different coefficient of thermal expansion; 2) a hydrogen cyanide wavelength reference absorption cell that absorbs light at discrete wavelengths corresponding to the molecular vibration mode frequencies of the gas. A first photodetector sees the transmission spectrum and a second sees the reflections from Bragg gratings in a sensing array. In this system there is no temperature compensation step as the absorption lines are not sensitive to temperature.
摘要翻译：布拉格光栅询问系统中的被动温度补偿可调滤波器校准装置。本发明包括两个系统：1）双基板布拉格光栅校准系统，使用结合到公共主机衬底的光栅阵列和结合到具有不同热系数的材料的单个光栅来估计光栅阵列的温度扩张; 2）吸收对应于气体的分子振动模式频率的离散波长的光的氰化氢波长参考吸收单元。第一光电检测器看到透射光谱，第二光电检测器看到来自感测阵列中的布拉格光栅的反射。在该系统中，由于吸收线对温度不敏感，因此没有温度补偿步骤。

4. 发明授权

US06619864B2 Optical channel monitor with continuous gas cell calibration 有权
公开(公告)号：US06619864B2
公开(公告)日：2003-09-16
申请号：US09808222
申请日：2001-03-15
申请人： Gregg A. Johnson , Bryan L. Althouse
发明人： Gregg A. Johnson , Bryan L. Althouse
IPC分类号： H04B1008
CPC分类号： H04B10/077 , H04B10/07955
摘要： The invention includes a method and apparatus for monitoring wavelength of an optical channel. A tunable optical bandpass filter is used to correlate a signal from an optical transmission line with a signal from a reference light source. The signal from the reference light source passes through a reference gas cell. The absorption lines of the reference gas provide a known calibration standard against which measured values may be compared. The invention finds applications in optical transmission systems, including wavelength division multiplexed and dense wavelength division multiplexed (WDM and DWDM) optical communication systems.

5. 发明授权

US06573489B1 Passive, temperature compensated techniques for tunable filter calibration in bragg-grating interrogation systems 失效
标题翻译：被动温度补偿技术，用于布拉格光栅询问系统中的可调谐滤波器校准
公开(公告)号：US06573489B1
公开(公告)日：2003-06-03
申请号：US09635227
申请日：2000-08-09
申请人： Gregg A. Johnson , Bryan L. Althouse , Greg Nau , Sandeep T. Vohra
发明人： Gregg A. Johnson , Bryan L. Althouse , Greg Nau , Sandeep T. Vohra
IPC分类号： G01J104
CPC分类号： G01K11/3206 , G02B6/0218 , G02B6/02204 , G02B6/29319 , G02B6/29395 , G02B6/29398 , H04B10/07
摘要： A passive, temperature compensated tunable filter calibration device for a Bragg grating interrogation system. In a first system, a dual-substrate Bragg grating calibration system, the temperature of an array of gratings is estimated using an array of gratings bonded to a common host substrate and a single grating bonded to a material with a different coefficient of thermal expansion. Changes in a common temperature of the substrates is measured by monitoring the difference between shifts of grating wavelength. As a filter voltage is scanned from its lowest to its highest voltage, the voltages are recorded. The second lowest wavelength corresponds to the grating attached to the differing substrate. The voltages are used to calculate a voltage-to-wavelength function for the scanning range of the filter. To compensate for variations in a calibration curve and temperature variations of the calibration array, the temperature is estimated and function re-calculated at every pass of the scanning filter. In a second system, a hydrogen-cyanide wavelength reference absorption cell that absorbs light at discrete wavelengths corresponding to the molecular vibrational mode frequencies of the gas. With a broadband optical light input to the cell, the output displays the spectrum of the input with several narrow dips in the spectra corresponding to the absorption lines of the cell. A first photodetector sees the transmission spectrum and a second sees the reflections from Bragg gratings in a sensing array. The filter drive voltages that coincide with the dips of the transmission spectrum are used to calibrate the voltage-to-wavelength function of the scanning filter. In this system there is no temperature compensation step as the absorption lines are not sensitive to temperature.
摘要翻译：用于布拉格光栅询问系统的无源温度补偿可调滤波器校准装置。在第一系统中，双衬底布拉格光栅校准系统，使用结合到公共主机衬底的光栅阵列和结合到具有不同热膨胀系数的材料的单个光栅来估计光栅阵列的温度。通过监测光栅波长的偏移之间的差异来测量衬底的共同温度的变化。当滤波器电压从最低电压被扫描到最高电压时，记录电压。第二低的波长对应于附着于不同基底的光栅。电压用于计算滤波器扫描范围的电压 - 波长功能。为了补偿校准曲线的变化和校准阵列的温度变化，在扫描过滤器的每次通过时估计温度并重新计算功能。在第二系统中，吸收对应于气体的分子振动模式频率的离散波长的光的氰化氢波长参考吸收单元。通过宽带光输入到单元格，输出显示与对应于单元的吸收线的光谱中的几个窄幅下降的输入光谱。第一光电检测器看到透射光谱，第二光电检测器看到来自感测阵列中的布拉格光栅的反射。使用与透射光谱的下降一致的滤波器驱动电压来校准扫描滤波器的电压 - 波长功能。在该系统中，由于吸收线对温度不敏感，因此没有温度补偿步骤。

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