公开(公告)号：US09163960B2

公开(公告)日：2015-10-20

申请号：US14201915

申请日：2014-03-09

Applicant: University of Electronic Science and Technology of China

Inventor： Yunjiang Rao ,  Zinan Wang ,  Zengling Ran

IPC: G01J5/00 ,  G01D5/353 ,  G01J1/42 ,  G01J5/10

CPC classification number: G01D5/35354 ,  G01J1/42 ,  G01J5/10

Abstract: A long-distance polarization and phase-sensitive reflectometry based on random laser amplification for extending a sensing distance includes a long-distance polarization and phase-sensitive reflectometry of a distributed Raman amplification based on optical fiber random lasers generated by unilateral pumps, a long-distance polarization and phase-sensitive reflectometry of a distributed Raman amplification based on optical fiber random lasers generated by bilateral pumps, and a long-distance polarization and phase-sensitive reflectometry of a Raman amplification based on a combination of optical fiber random lasers generated by unilateral pumps and a common Raman pump source, which are applied in optical fiber perturbation sensing and have a capability of greatly improving a working distance of a sensing system and a high practicability.

Abstract translation: 基于用于扩展感测距离的随机激光放大的长距离偏振和相敏反射测量包括基于由单侧泵产生的光纤随机激光器的分布式拉曼放大的长距离偏振和相敏反射测量， 基于由双边泵生成的光纤随机激光器的分布式拉曼放大的距离偏振和相敏反射测量，以及基于单边产生的光纤随机激光器的组合的拉曼放大的长距离偏振和相敏反射测量 泵和普通的拉曼泵浦源，它们应用于光纤扰动感测中，具有大大提高感测系统工作距离和高实用性的能力。

公开(公告)号：US20180156642A1

公开(公告)日：2018-06-07

申请号：US15874672

申请日：2018-01-18

Applicant: University of Electronic Science and Technology of China

Inventor： Zinan Wang ,  Ji Xiong ,  Lianlian Xie ,  Yunjiang Rao

IPC: G01D5/353 ,  G01D5/26 ,  G01P3/36

Abstract: A method of improving measurement speed of distributed optical fiber sensors by adopting orthogonal signals and the system thereof is disclosed, which is related to the optical fiber sensor field and solves the problems that conventional technology will increasing the bandwidth of the received signal, reducing the signal-to-noise ratio of the received signal or distortion the spatial resolution of the system. The method comprises steps of generating N periodic orthogonal optical pulse sequence; injecting the N periodic orthogonal optical pulse sequence into the optical fiber under test(5); collecting the scattered light signal; demodulating the scattered light signal with the local oscillating light and then converting into digital signals; extracting the scatter information of the orthogonal optical pulses from the collected digital signals; and arranging the scattered information in order of precedence of the infusion. The measurement speed of the distributed optical fiber sensors is improved by N−1 times.

公开(公告)号：US20140183360A1

公开(公告)日：2014-07-03

申请号：US14201915

申请日：2014-03-09

Applicant: University of Electronic Science and Technology of China

Inventor： Yunjiang Rao ,  Zinan Wang ,  Zengling Ran

IPC: G01M11/00

CPC classification number: G01D5/35354 ,  G01J1/42 ,  G01J5/10

Abstract: A long-distance polarization and phase-sensitive reflectometry based on random laser amplification for extending a sensing distance includes a long-distance polarization and phase-sensitive reflectometry of a distributed Raman amplification based on optical fiber random lasers generated by unilateral pumps, a long-distance polarization and phase-sensitive reflectometry of a distributed Raman amplification based on optical fiber random lasers generated by bilateral pumps, and a long-distance polarization and phase-sensitive reflectometry of a Raman amplification based on a combination of optical fiber random lasers generated by unilateral pumps and a common Raman pump source, which are applied in optical fiber perturbation sensing and have a capability of greatly improving a working distance of a sensing system and a high practicability.

Abstract translation: 基于用于扩展感测距离的随机激光放大的长距离偏振和相敏反射测量包括基于由单侧泵产生的光纤随机激光器的分布式拉曼放大的长距离偏振和相敏反射测量， 基于由双边泵生成的光纤随机激光器的分布式拉曼放大的距离偏振和相敏反射测量，以及基于单边产生的光纤随机激光器的组合的拉曼放大的长距离偏振和相敏反射测量 泵和普通的拉曼泵浦源，它们应用于光纤扰动感测中，具有大大提高感测系统工作距离和高实用性的能力。

公开(公告)号：US20170097281A1

公开(公告)日：2017-04-06

申请号：US15382671

申请日：2016-12-18

Applicant: University of Electronic Science and Technology of China

Inventor： Zinan Wang ,  Yun Fu ,  Yunjiang Rao

IPC: G01M11/00 ,  G01N21/47 ,  G01N21/21

CPC classification number: G01M11/3181

Abstract: A method for distributedly measuring polarization transmission matrices of an optical fiber includes steps of: inputting a fully polarized pulse into the optical fiber with linear birefringence only; and demodulating polarization states of Rayleigh backscattered light at different points on the optical fiber from a pulse input end; after demodulating, dividing the polarization states of the Rayleigh backscattered light into Q groups in sequence, wherein every three polarization states are divided into one group; calculating a transmission matrix of Group N; and solving the equation set using a numerical analysis method for obtaining multiple solutions, and screening the multiple solutions according to characteristics of the polarization transmission matrix, wherein each time of screening provides a unique solution Mx(N) of the equation set; continually updating MA values for iteration, so as to obtain the distribution of polarization transmission matrices of the optical fiber.

公开(公告)号：US10564012B2

公开(公告)日：2020-02-18

申请号：US15874672

申请日：2018-01-18

Applicant: University of Electronic Science and Technology of China

Inventor： Zinan Wang ,  Ji Xiong ,  Lianlian Xie ,  Yunjiang Rao

IPC: G01D5/353 ,  G01P3/36 ,  G01D5/26

Abstract: A method of improving measurement speed of distributed optical fiber sensors by adopting orthogonal signals and the system thereof is disclosed, which is related to the optical fiber sensor field and solves the problems that conventional technology will increasing the bandwidth of the received signal, reducing the signal-to-noise ratio of the received signal or distortion the spatial resolution of the system. The method comprises steps of generating N periodic orthogonal optical pulse sequence; injecting the N periodic orthogonal optical pulse sequence into the optical fiber under test(5); collecting the scattered light signal; demodulating the scattered light signal with the local oscillating light and then converting into digital signals; extracting the scatter information of the orthogonal optical pulses from the collected digital signals; and arranging the scattered information in order of precedence of the infusion. The measurement speed of the distributed optical fiber sensors is improved by N−1 times.

公开(公告)号：US20190058524A1

公开(公告)日：2019-02-21

申请号：US16166096

申请日：2018-10-20

Applicant: University of Electronic Science and Technology of China

Inventor： Yunjiang Rao ,  Yun Fu ,  Jiaqi Li ,  Zinan Wang

IPC: H04B10/25 ,  H04J14/02 ,  H04B10/50

Abstract: A hybrid distributed amplification method based on a random fiber laser generated within erbium fiber with low doping concentration, i.e. weak erbium-doped fiber (WEDF), which includes: Step 1. constructing a fiber link via WEDF; Step 2. generating the random fiber laser based on the fiber link, the pump source, the wavelength division multiplexer and the strong feedback module; Step 3. constructing the spatial equalized gain based on hybrid gain of the erbium fiber and random fiber laser; Step 4. the signal is amplified by the hybrid spatial equalized gain. The present invention solves the typical problem of high laser threshold and low pump conversion efficiency when conventional fiber is used to generate random fiber laser for distributed amplification.

公开(公告)号：US20180366897A1

公开(公告)日：2018-12-20

申请号：US16112516

申请日：2018-08-24

Applicant: University of Electronic Science and Technology of China

Inventor： Zinan Wang ,  Jiaqi Li ,  Han Wu ,  Yunjiang Rao

IPC: H01S3/067

Abstract: A random distributed Rayleigh feedback fiber laser based on a double-cladding weakly ytterbium-doped fiber includes: a pump laser source, a pump combiner, a cladding power stripper, and a double-cladding weakly ytterbium-doped fiber for simultaneously achieving distributed active gain and random distributed Rayleigh feedback. An output end of the pump combiner is connected with one end of the double-cladding weakly ytterbium-doped fiber, the other end of the double-cladding weakly ytterbium-doped fiber is connected with an input end of the cladding power stripper, and a concentration of ytterbium ions in the double-cladding weakly ytterbium-doped fiber is in a range of 0.5×1023 to 1×1027/m3. The laser provided by the present invention solves the problem that the existing random fiber lasers cannot simultaneously utilize distributed active gain and random distributed Rayleigh feedback with a single type of fiber.

公开(公告)号：US09841349B2

公开(公告)日：2017-12-12

申请号：US15382671

申请日：2016-12-18

Applicant: University of Electronic Science and Technology of China

Inventor： Zinan Wang ,  Yun Fu ,  Yunjiang Rao

IPC: G01N21/00 ,  G01M11/00

CPC classification number: G01M11/3181

Abstract: A method for distributedly measuring polarization transmission matrices of an optical fiber includes steps of: inputting a fully polarized pulse into the optical fiber with linear birefringence only; and demodulating polarization states of Rayleigh backscattered light at different points on the optical fiber from a pulse input end; after demodulating, dividing the polarization states of the Rayleigh backscattered light into Q groups in sequence, wherein every three polarization states are divided into one group; calculating a transmission matrix of Group N; and solving the equation set using a numerical analysis method for obtaining multiple solutions, and screening the multiple solutions according to characteristics of the polarization transmission matrix, wherein each time of screening provides a unique solution Mx(N) of the equation set; continually updating MA values for iteration, so as to obtain the distribution of polarization transmission matrices of the optical fiber.