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1. 发明申请

WO2022125705A1 VIBRATION DETECTION USING PHASE RECOVERED FROM AN OPTICAL TRANSPONDER WITH COHERENT DETECTION 审中-公开
公开(公告)号：WO2022125705A1
公开(公告)日：2022-06-16
申请号：PCT/US2021/062478
申请日：2021-12-08
申请人： NEC LABORATORIES AMERICA, INC. [US]/[US]
发明人： IP, Ezra , HUANG, Yue-Kai
IPC分类号： G01H9/00 , G01D5/353
摘要： Aspects of the present disclosure describe systems, methods. and structures for vibration detection using phase recovered from an optical transponder with coherent detection. Advantageously, our systems, methods, and structures leverage contemporary digital coherent receiver architecture in which various adaptive DSP operations performed to recover transmitted data track optical phase. The phase is extracted at low overhead cost, allowing a digital coherent transponder to perform vibration detection / monitoring as an auxiliary function to data transmission. Demonstration of vibration detection and localization based on the extraction of optical phase from payload-carrying telecommunications signal using a coherent receiver in a bidirectional WDM transmission system is shown and described.

2. 发明申请

WO2020237038A1 IMPROVING PERFORMANCE OF RAYLEIGH-BASED PHASE-OTDR WITH CORRELATION-BASED DIVERSITY COMBINING AND BIAS REMOVAL 审中-公开
公开(公告)号：WO2020237038A1
公开(公告)日：2020-11-26
申请号：PCT/US2020/033977
申请日：2020-05-21
申请人： NEC LABORATORIES AMERICA, INC. , NEC CORPORATION
发明人： IP, Ezra , HUANG, Yue-Kai
IPC分类号： G01H9/00
摘要： Aspects of the present disclosure describe systems, methods and apparatus for improving the performance of Rayleigh-based phase-OTDR with correlation-based diversity combining and bias removal.

3. 发明申请

WO2020163577A1 OPTICAL FIBER SENSING SYSTEMS, METHODS, STRUCTURES AND APPLICATION 审中-公开
公开(公告)号：WO2020163577A1
公开(公告)日：2020-08-13
申请号：PCT/US2020/016980
申请日：2020-02-06
申请人： NEC LABORATORIES AMERICA, INC.
发明人： IP, Ezra , HUANG, Yue-Kai , HU, Junqiang , JI, Philip , MURAKAMI, Shuji , LI, Yaowen
IPC分类号： H04B10/071 , H04B10/25 , H04B10/61 , G01D5/353 , H04Q11/00
摘要： Aspects of the present disclosure describe optical fiber sensing systems, methods and structures and application employing coherent detection of backscattered signals.

4. 发明申请

WO2018039046A1 DISTRIBUTED ACOUSTIC SENSING IN AN OPTICAL FIBER USING DISTRIBUTED MODE COUPLING AND DELAY 审中-公开
标题翻译：使用分布式耦合和延迟的光纤中的分布式声学传感
公开(公告)号：WO2018039046A1
公开(公告)日：2018-03-01
申请号：PCT/US2017/047412
申请日：2017-08-17
申请人： NEC LABORATORIES AMERICA, INC.
发明人： YAMAN, Fatih , MILIONE, Giovanni , ZHANG, Shaoliang , HUANG, Yue-Kai
IPC分类号： G01M11/00 , G02B6/14
摘要： A system and method are provided for distributed acoustic sensing in an optical fiber (300). The system includes a transmitter (2001) for simultaneously propagating a sequence of M light pulses through the optical fiber (300) using a spatial mode selected from a set of N spatial modes provided by a spatial mode selector (200) for the transmitter (2001) that is coupled to an input to the optical fiber (300), with M and N being respective integers greater than one. The system further includes a receiver (2002) for receiving the sequence of M light pulses at an output of the optical fiber (300) and detecting an environmental perturbation in the optical fiber (300) based on an evaluation of a propagation of the sequence of M light pulses through the optical fiber (300).
摘要翻译：提供了用于光纤（300）中的分布式声学感测的系统和方法。该系统包括用于使用从一组N个空间模式中选择的空间模式通过光纤（300）同时传播一串M个光脉冲的发射器（2001）由耦合到光纤（300）的输入的发射器（2001）的空间模式选择器（200）提供，其中M和N分别是大于1的整数。该系统还包括用于在光纤（300）的输出处接收M个光脉冲序列并基于对光纤（300）的序列的传播的评估来检测光纤（300）中的环境干扰的接收器（2002） M光脉冲通过光纤（300）。

5. 发明申请

WO2022087312A1 POLARIZATION DIVERSITY COMBINING METHOD IN COHERENT DAS MAINTAINING PHASE CONTINUITY 审中-公开
公开(公告)号：WO2022087312A1
公开(公告)日：2022-04-28
申请号：PCT/US2021/056110
申请日：2021-10-21
申请人： NEC LABORATORIES AMERICA, INC.
发明人： HU, Junqiang , HUANG, Yue-Kai , IP, Ezra
IPC分类号： G01D5/353
摘要： Aspects of the present disclosure describe a polarization diversity combining method for coherent distributed acoustic sensing (DAS) maintaining phase continunity.

6. 发明申请

WO2021231344A1 IMPROVED DISTRIBUTED ACOUSTIC SENSING USING DYNAMIC RANGE SUPPRESSION 审中-公开
公开(公告)号：WO2021231344A1
公开(公告)日：2021-11-18
申请号：PCT/US2021/031667
申请日：2021-05-11
申请人： NEC LABORATORIES AMERICA, INC.
发明人： IP, Ezra , HUANG, Yue-Kai , JI, Philip , MURAKAMI, Shuji
IPC分类号： G01H9/00 , G01V1/22 , G01V1/40 , G01N29/24
摘要： Aspects of the present disclosure describe improved distributed acoustic sensing using dynamic range suppression of optical time domain reflectometry either by using a feedback loop comprising optical and electrical elements or using a nonlinear element in the electrical domain after coherent detection. When using a feedback loop, the amplitude of the periodic waveform of coherent OTDR can be inverted. This allows optical precompensation of the received optical signal before coherent detection with the goal of minimizing amplitude dynamic range. Alternatively, a nonlinear element in the electrical domain can reduce amplitude dynamic range before sampling by analog-to-digital converters (ADC).

7. 发明申请

WO2020132169A1 OPTICAL FIBER SENSING SYSTEMS, METHODS, STRUCTURES AND APPLICATIONS 审中-公开
公开(公告)号：WO2020132169A1
公开(公告)日：2020-06-25
申请号：PCT/US2019/067339
申请日：2019-12-19
申请人： NEC LABORATORIES AMERICA, INC.
发明人： HUANG, Ming-Fang , HUANG, Yue-Kai , IP, Ezra , WANG, Ting
IPC分类号： G01D5/26 , G06N3/08 , G01K11/32 , G01H9/00
摘要： Aspects of the present disclosure describe systems, methods and structures and applications of optical fiber sensing. Of significance, systems, methods, and structures according to aspects of the present disclosure may reuse and/or retrofit/upgrade existing optical fiber cables as part of optical fiber sensing that may find important societal application including intrusion detection, road traffic monitoring and infrastructure health monitoring. Combining such optical fiber sensing with artificial intelligence (AI) further enables powerful applications at low(er) cost.

8. 发明申请

WO2018093810A1 LOW-COMPLEXITY BRILLOUIN OPTICAL TIME-DOMAIN REFLECTOMETERS USING SYB-NYQUIST SAMPLING 审中-公开
公开(公告)号：WO2018093810A1
公开(公告)日：2018-05-24
申请号：PCT/US2017/061667
申请日：2017-11-15
申请人： NEC LABORATORIES AMERICA, INC
发明人： YAMAN, Fatih , ZHANG, Shaoliang , IP, Ezra , HUANG, Yue-Kai , MILIONE, Giovanni
IPC分类号： G01D5/353 , G01K11/32
CPC分类号： G01D5/35364 , G01L1/242 , G01M11/3118 , G01M11/3145 , G01M11/3154
摘要： Methods and systems for Brillouin optical time-domain reflectometry include optically filtering out non-Brillouin signals reflected from a fiber. Brillouin signals reflected from the fiber are coupled with a local oscillator to produce a Brillouin shift signals. The Brillouin shift signals are converted to an electrical domain using a photodetector. The electrical Brillouin shift signals are converted to a digital domain using a low-speed analog-to-digital converter that has a sampling rate below a Nyquist rate sufficient to fully resolve the electrical Brillouin shift signals.

9. 发明申请

WO2016144850A1 MITIGATION OF MULTI-PATH INTERFERENCE FROM QUASI-SINGLE-MODE FIBER USING HYBRID SPAN CONFIGURATION AND DIGITAL SIGNAL PROCESSING 审中-公开
标题翻译：使用混合超音速配置和数字信号处理从单模光纤减少多路干扰
公开(公告)号：WO2016144850A1
公开(公告)日：2016-09-15
申请号：PCT/US2016/021131
申请日：2016-03-07
申请人： NEC LABORATORIES AMERICA, INC.
发明人： ZHANG, Shaoliang , YAMAN, Fatih , HUANG, Yue-Kai , IP, Ezra , INADA, Yoshihisa
IPC分类号： H04B10/2507 , H04B10/2543
CPC分类号： H04B10/2581 , H04B10/2543 , H04B10/6971 , H04L25/03885
摘要： Aspects of the present disclosure are directed to the mitigation of multi-path interference from quasi-single-mode fiber using hybrid span configuration and digital signal processing wherein a hybrid span of quasi-single mode fibers and single-mode fibers are used to configure the hybrid span. Additional aspects are directed to introducing a low-baud rate sub-banding signal to reduce the number of DD-LMS taps required when compensating the multi-path interference as the low-baud rate signal requires fewer taps to cover a given range of MPI as compared to a high-baud rate signal. Finally further aspects are directed to an ALMS equalizer which further reduces the number of equalizer taps by shifting its center tap towards the right if higher-order modes transmit slower than a fundamental mode, otherwise the center tap is shifted to the left.
摘要翻译：本公开的方面涉及使用混合跨度配置和数字信号处理来缓解来自准单模光纤的多径干扰，其中使用准单模光纤和单模光纤的混合跨度来配置混合跨度另外的方面是引入低波特率子带信号来减少在补偿多路径干扰时所需的DD-LMS抽头的数量，因为低波特率信号需要更少的抽头来覆盖给定范围的MPI，因为与高波特率信号相比。最后，还有一些方面针对ALMS均衡器，如果高阶模式的传输速度比基本模式慢，则通过将其中心抽头向右移动来进一步减少均衡器抽头的数量，否则中心抽头向左移位。

10. 发明申请

WO2009120219A1 DYNAMIC SIGNAL EQUALIZATION IN OPTICAL TRANSMISSION SYSTEMS 审中-公开
标题翻译：光传输系统中的动态信号均衡
公开(公告)号：WO2009120219A1
公开(公告)日：2009-10-01
申请号：PCT/US2008/059089
申请日：2008-04-02
申请人： NEC LABORATORIES AMERICA, INC.
发明人： HUANG, Yue-Kai , WANG, Ting , XU, Lei
IPC分类号： H04B10/18
CPC分类号： H04B10/25137 , H04B10/2575
摘要： In an optical transmission system, data is transmitted via an optical beam modulated with an arbitrary waveform. The optical beam is transmitted through at least one optical element. Transmission through at least one otpical element degrades the signal quality of the initial optical beam. The signal characteristics of at least one optical beam at the output of at least one optical element are used as feedback to shape the arbitrary waveform to improve signal characteristics. An arbitrary waveform may be used to compensate signal degradation caused by a multiplexer/demultiplexer in a wavelength division multiplex system.
摘要翻译：在光传输系统中，通过任意波形调制的光束发送数据。光束通过至少一个光学元件透射。通过至少一个元件的传输降低了初始光束的信号质量。使用至少一个光学元件的输出处的至少一个光束的信号特性作为反馈来形成任意波形以改善信号特性。可以使用任意波形来补偿由波分多路复用系统中的多路复用器/解复用器引起的信号劣化。

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