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公开(公告)号：US12095501B2
公开(公告)日：2024-09-17
申请号：US17946054
申请日：2022-09-16
Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY
Inventor： Zhongmin Yang , Xiaoxiao Wen , Yueyi Sun , Xiaoming Wei
IPC: H04B10/079
CPC classification number: H04B10/079
Abstract: The present invention discloses an intelligent real-time full-field measurement method and system for a high-repetition-rate femtosecond pulse. The method includes: splitting a to-be-tested signal into n channels; performing a frequency reduction separation on each of the channels; splitting each channel of frequency-reduced time-domain demultiplexed signals into two signals, where a small dispersion component performs time-domain stretching on one signal, and a big dispersion component performs a time-frequency conversion on the other signal; acquiring time-domain intensity information of the to-be-tested signal after the stretching by the small dispersion component and frequency-domain envelope information of the to-be-tested signal after the time-frequency conversion by the big dispersion component; and continuously iterating the acquired time-domain intensity information and frequency-domain envelope information according to a Gerchberg-Saxton algorithm until a convergence is achieved, to obtain information about intensity and phase of the to-be-tested signal in a time domain and a frequency domain.
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公开(公告)号：US11768113B2
公开(公告)日：2023-09-26
申请号：US17436789
申请日：2020-04-30
Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY
Inventor： Zhongmin Yang , Xiaoxiao Wen , Wei Lin , Xiaoming Wei
CPC classification number: G01J11/00 , G02B27/14 , G02F1/353 , G02F1/3503
Abstract: The present application relates to a light pulse signal processing system. A to-be-measured signal light source generates a to-be-measured signal light pulse, and the to-be-measured signal light pulse is transmitted to a cylindrical lens. The to-be-measured signal light pulse is converted into a to-be-measured signal light pulse having a spatial angle chirp by the cylindrical lens, and is outputted and is incident into a pair of long mirrors at different angles. The to-be-measured signal light pulse incident at different incident angles is delayed by the pair of long mirrors. A cluster of to-be-measured signal light pulses with a corresponding repetition rate is outputted to a beam combining mirror, and is combined with a cluster of reference light pulses by the beam combining mirror. A light signal analysis device analyzes the combined cluster of light pulses.
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公开(公告)号：US09787050B2
公开(公告)日：2017-10-10
申请号：US15035605
申请日：2014-12-04
Applicant: South China University of Technology
Inventor： Shanhui Xu , Changsheng Yang , Zhongmin Yang , Zhouming Feng , Qinyuan Zhang , Zhonghong Jiang
IPC: H01S3/137 , H01S3/1055 , H01S3/139 , H01S3/106 , H01S3/094 , H01S3/102 , H01S3/067 , H01S3/08 , H01S3/16 , H01S3/17 , H01S3/00 , H01S3/04
CPC classification number: H01S3/1055 , H01S3/0064 , H01S3/0401 , H01S3/0405 , H01S3/06708 , H01S3/06712 , H01S3/06716 , H01S3/0675 , H01S3/08027 , H01S3/094042 , H01S3/1028 , H01S3/1062 , H01S3/137 , H01S3/139 , H01S3/1603 , H01S3/1618 , H01S3/175
Abstract: A tunable narrow-linewidth single-frequency linear-polarization laser device comprising a heat sink, a pumping source packaged on the heat sink, a first and second collimating lenses, a laser back cavity mirror, a thermal optical tunable filter, a rare-earth-ion heavily-doped multicomponent glass optical fiber, a super-structure polarization-maintaining fiber grating, a polarization-maintaining optical isolator, a polarization-maintaining optical fiber, and a thermoelectric refrigerating machine. The laser device uses a short and straight single-frequency resonant cavity structure, the heavily-doped and high-gain characteristics of the multicomponent glass optical fiber, a frequency selection role and wavelength tuning function of the thermal optical tunable filter and the superstructure polarization-maintaining fiber grating, and combines a precision temperature adjustment technology, and by means of real-time adjustment of distribution of reflection wavelengths and transmission wavelengths, the laser device changes spectrum peak overlapping positions, so as to implement stable output of wide-tuning-range, extra-narrow-linewidth, high-extinction-ratio and high-output-power continuously tunable single-frequency linear-polarization laser.
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4.发明申请公开(公告)号：US20160261085A1
公开(公告)日：2016-09-08
申请号：US15035605
申请日：2014-12-04
Applicant: South China University of Technology
Inventor： Shanhui Xu , Changsheng Yang , Zhongmin Yang , Zhouming Feng , Qinyuan Zhang , Zhonghong Jiang
CPC classification number: H01S3/1055 , H01S3/0064 , H01S3/0401 , H01S3/0405 , H01S3/06708 , H01S3/06712 , H01S3/06716 , H01S3/0675 , H01S3/08027 , H01S3/094042 , H01S3/1028 , H01S3/1062 , H01S3/137 , H01S3/139 , H01S3/1603 , H01S3/1618 , H01S3/175
Abstract: A tunable narrow-linewidth single-frequency linear-polarization laser device comprising a heat sink, a pumping source packaged on the heat sink, a first and second collimating lenses, a laser back cavity mirror, a thermal optical tunable filter, a rare-earth-ion heavily-doped multicomponent glass optical fiber, a super-structure polarization-maintaining fiber grating, a polarization-maintaining optical isolator, a polarization-maintaining optical fiber, and a thermoelectric refrigerating machine. The laser device uses a short and straight single-frequency resonant cavity structure, the heavily-doped and high-gain characteristics of the multicomponent glass optical fiber, a frequency selection role and wavelength tuning function of the thermal optical tunable filter and the superstructure polarization-maintaining fiber grating, and combines a precision temperature adjustment technology, and by means of real-time adjustment of distribution of reflection wavelengths and transmission wavelengths, the laser device changes spectrum peak overlapping positions, so as to implement stable output of wide-tuning-range, extra-narrow-linewidth, high-extinction-ratio and high-output-power continuously tunable single-frequency linear-polarization laser.
Abstract translation: 一种可调窄线宽单频线性偏振激光装置，包括散热器，封装在散热片上的泵浦源，第一和第二准直透镜，激光后腔镜，热光可调谐滤光器，稀土 超重掺杂多组分玻璃光纤，超结构偏振保持光纤光栅，偏振保持光隔离器，偏振保持光纤和热电制冷机。 激光器件采用短路和直线单频谐振腔结构，多组分玻璃光纤的重掺杂和高增益特性，热光可调谐滤波器的频率选择作用和波长调谐功能以及上部结构极化 - 维持光纤光栅，结合精密温度调节技术，通过实时调整反射波长和透射波长的分布，激光器件改变光谱峰值重叠位置，实现宽调谐范围的稳定输出 ，超窄线宽，高消光比和高输出功率连续可调谐单频线偏振激光器。
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公开(公告)号：US11862925B2
公开(公告)日：2024-01-02
申请号：US17277305
申请日：2018-10-30
Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY
Inventor： Shanhui Xu , Qilai Zhao , Zhitao Zhang , Changsheng Yang , Zhouming Feng , Zhongmin Yang
CPC classification number: H01S3/1308 , H01S3/0675 , H01S3/06716 , H01S3/08013 , H01S3/08054 , H01S3/09415 , H01S3/094003 , H01S3/10061 , H01S3/1608 , H01S3/1618
Abstract: A tunable narrow-linewidth photo-generated microwave source based on polarization control includes a high-reflectivity fiber grating, a high-gain fiber, a low-reflectivity polarization-maintaining fiber grating, a stress adjusting device, a single-mode semiconductor pump laser, an optical wavelength division multiplexer, a polarization beam splitter, a polarization controller, an optical coupler, and a photoelectric detector. Birefringence distribution in the low-reflectivity polarization-maintaining fiber grating is controlled by adjusting a stress magnitude of the stress adjusting device to the low-reflectivity polarization fiber grating, thereby controlling a laser frequency working in different polarization modes in a resonant cavity, and a tunable narrow-linewidth photo-generated microwave source is generated by a beat-frequency technology using a dual-wavelength narrow-linewidth laser with variable frequency intervals.
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Patent Agency Ranking
公开(公告)号：US10003167B2
公开(公告)日：2018-06-19
申请号：US15567082
申请日：2015-12-31
Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY
Inventor： Shanhui Xu , Zhongmin Yang , Yuanfei Zhang , Zhouming Feng , Changsheng Yang
CPC classification number: H01S3/0675 , H01S3/08 , H01S3/094053 , H01S3/10023 , H01S3/10084 , H01S3/10092 , H01S3/1062 , H04B10/25 , H04B10/548 , H04J14/002
Abstract: A width-tunable single-frequency fiber laser light source for coherent optical orthogonal frequency division multiplexing system including a chirped fiber grating with high reflectivity, a high gain optical fiber, a chirped fiber grating with low reflectivity, a single-mode semiconductor pump laser, an optical wavelength division multiplexer, an optical coupler, an optical circulator, and a tunable optical filter module is provided. The chirped fiber grating with low reflectivity and the chirped fiber grating with high reflectivity together serve as a front cavity mirror and a back cavity mirror of a resonant cavity to realize laser oscillation. After a laser with broad spectrum output from the optical wavelength division multiplexer is split by the optical coupler, a part of the laser passes through the optical circulator to enter the tunable optical filter module. A wavelength corresponding to any nominal center frequency stipulated by the ITU-T is selected by the tunable optical filter module, with a 3 dB spectral width of less than 0.1 nm, and is then injected back into the resonant cavity via the optical circulator and the optical coupler, and the resonant cavity is subjected to a self-injection locking.
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公开(公告)号：US11870210B2
公开(公告)日：2024-01-09
申请号：US15734648
申请日：2018-10-16
Applicant: South China University of Technology
Inventor： Jiulin Gan , Xiaobo Heng , Zhongmin Yang , Zhishen Zhang
IPC: H01S3/30 , H01S3/067 , H01S3/0804 , H01S3/094 , H01S3/10 , H01S3/08 , H01S3/0941
CPC classification number: H01S3/302 , H01S3/06754 , H01S3/06791 , H01S3/0804 , H01S3/094003 , H01S3/1001 , H01S3/1003 , H01S3/08013 , H01S3/09415 , H01S3/094065 , H01S3/10061
Abstract: The present invention discloses a transverse mode switchable all-fiber high-order mode Brillouin laser. The laser comprises a narrow linewidth pump laser, an optical amplifier, a 1×N optical switch (N≥2), a fiber mode selection coupler group, a first polarization controller, a fiber circulator, a fiber coupler, a second polarization controller, and a few-mode fiber. Based on the Brillouin nonlinear gain of a few-mode fiber in a ring cavity, the present invention realizes the resonance amplification of a specific order transverse mode in the cavity, and obtains the transverse mode switchable high-order mode laser beam output. The present invention, adopting an all-fiber structure, has the advantages of simple structure, low cost, easy fiber system integration, high stability and narrow linewidth of outputted laser beams, etc., and improves the practicality and reliability of high-order mode lasers.
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8.发明授权公开(公告)号：US10693274B2
公开(公告)日：2020-06-23
申请号：US16343412
申请日：2016-12-19
Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY
Inventor： Shanhui Xu , Zhongmin Yang , Yuning Zhang , Zhouming Feng , Changsheng Yang
Abstract: A multi-wavelength single-frequency optical fiber laser source for a laser radar system includes a resonant cavity composed of a high-reflectivity chirped optical fiber grating, a high gain optical fiber and a low-reflectivity chirped optical fiber grating, a single-mode semiconductor pump laser served as a pump light source, an optical wavelength division multiplexer, an optical coupler, an optical isolator, an optical circulator, an optical filter module, and a semiconductor optical amplifier. The pump light source performs optical fiber core pumping with respect to the high gain optical fiber. A portion of the wide-spectrum laser is filtered by the optical filter module to obtain a wavelength corresponding to a specific central frequency. Multi-wavelength laser lasing with a narrow linewidth and single longitudinal mode is implemented by combining a short linear resonant cavity structure and the optical filter module.
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公开(公告)号：US10608399B1
公开(公告)日：2020-03-31
申请号：US16266942
申请日：2019-02-04
Applicant: South China University of Technology
Inventor： Zhongmin Yang , Guowu Tang , Zhishen Zhang
Abstract: A manufacturing technique of ultra-wideband high gain optical fibers and devices is disclosed, including: (1) manufacturing a gain fiber, which is a composite structural optical fiber, having a core composed of a plurality of sets of sector structures distributed symmetrically or a plurality of concentric ring structures. The core is composed of at least two kinds of rare-earth-ion-doped glass, and luminescence centers are located in different sector or ring structure regions; and (2) constructing a fiber laser: using the gain fiber, selectively exciting rare earth ions in different regions in the core by controlling a shape of pump light spot, and combining with fiber grating pairs to realize a tunable laser output. The present disclosure can manufacture gain fibers with high-gain and ultra-wideband characteristics by combining the design of the fiber structure and the control of the light field of the pump light.
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公开(公告)号：US20190310498A1
公开(公告)日：2019-10-10
申请号：US16315114
申请日：2018-01-01
Applicant: South China University of Technology
Inventor： Shanhui Xu , Qilai Zhao , Zhongmin Yang , Zhouming Feng , Changsheng Yang
Abstract: The present invention provides a repetition frequency-tunable optical frequency comb generated by basis of optical feedback. The optical frequency comb comprises a single-frequency laser resonant cavity, a wavelength division multiplexer, a single-mode semiconductor pump light source, an optical circulator, a first optical fiber coupler, a second optical fiber coupler, a photoelectric detector, a highly-stable signal source, an error signal processing system, a laser frequency modulation device and a tunable laser-delay module. The present invention performs delay-time processing to the single-frequency laser by the tunable laser-delay module, and achieves an optical feedback by the optical circulator for injecting to the resonant cavity, generating a series of tunable laser longitudinal modes with equal frequency space. Meanwhile, in combination with the highly-stable signal source, the error signal processing system and the laser frequency modulation device, a laser frequency lock is achieved, and the laser frequency comb is generated. The invention obtains a repetition frequency-tunable laser frequency comb with a simple and practical method, having an extensive application prospect and huge application value in fields such as optical fiber sensing and spectroscopy of atom and molecule.
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