Prof. Zhi Liu Profile

Prof. Zhi Liu

at Changchun Univ of Science and Technology

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 21 April 2023 Paper

Research on all-optical wavelength conversion technology based on dual-pumped FWM

Yi Kang, Zhi Liu, YiDi Chang, Mingxue Shi

Proceedings Volume 12602, 1260215 (2023) https://doi.org/10.1117/12.2668013

KEYWORDS: Polarization, Technology, Laser communications, Telecommunications, Free space optics, Relays, Four wave mixing, Atmospheric turbulence, Signal attenuation, Modulation

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Proceedings Article | 21 April 2023 Paper

Channel equalization based on time domain spreading of Gaussian optical pulse turbulence channel transmission

Tongtong Geng, Zhi Liu, Yidi Chang, Haifeng Yao, Guiyun Zhang, Qingfang Jiang

Proceedings Volume 12602, 126020S (2023) https://doi.org/10.1117/12.2668184

KEYWORDS: Crosstalk, Atmospheric turbulence, Pulsed laser operation, Signal to noise ratio, Free space optical communications, Digital filtering

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Proceedings Article | 4 August 2022 Paper

Research on 4-PAM signal compensation technology for high-speed indoor FSOC based on FNN

Yidi Chang, Zhi Liu, Haifeng Yao, Tongtong Geng, Yugeng Chen, Shutong Liu

Proceedings Volume 12306, 123060L (2022) https://doi.org/10.1117/12.2641357

KEYWORDS: Telecommunications, Nonlinear optics, Complex systems, Free space optics, Neural networks, Modulators, Digital signal processing, Optical communications, Modulation

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SPIE Journal Paper | 9 July 2022

Performance analysis of PPM FSOC system with APD detector considering atmospheric turbulence channel and fiber coupling

Yidi Chang, Zhi Liu, Haifeng Yao, Xiaolong Ni, Baoqun Li

OE, Vol. 61, Issue 07, 076103, (July 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.7.076103

KEYWORDS: Avalanche photodetectors, Sensors, Telecommunications, Modulation, Signal to noise ratio, Atmospheric turbulence, Turbulence, Wavefront compensation, Orthogonal frequency division multiplexing, Optical engineering

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Proceedings Article | 20 December 2019 Paper

Research on light-flux fluctuations reciprocity of bidirectional atmospheric laser transmission channel

Yi Liu, Xiao-long Ni, Zhi Liu, Jia-xu Zhao, Hui-lin Jiang

Proceedings Volume 11209, 112092V (2019) https://doi.org/10.1117/12.2548690

KEYWORDS: Atmospheric optics, Free space optics, Atmospheric propagation, Receivers, Wave propagation, Atmospheric turbulence

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Atmospheric turbulence has a greater influence on the performance of the atmospheric laser communication system increasing the bit error rate (BER) and reducing the signal to noise ratio (SNR). If the bidirectional free space laser transmission link has channel reciprocity, the change of optical signal intensity at the two terminal is correlated, and channel state information (CSI) can be obtained at the transmitter, which saves channel space and improves real-time detection of instantaneous CSI and communication channel capacity. In this paper, under the condition of weak-fluctuation, according to the Rytov approximation theory, the relationship between the correlation of optical signal of receiving terminal and transmission path of bidirectional free space laser transmission link is deduced and analyzed, and then the coaxial atmospheric laser transmission link of bidirectional transmitting and receiving is built for field experiment. Experimental results show that the intensity of optical signal at the receiving terminalof bidirectional free space laser transmission link is correlated. The correlation coefficient is related to the location of transmission path. The probability density distribution of the optical signal collected by the experiment obeys the terminal and approximation theory, the relationship between the correlation of optical signal of receiving terminal and transmission path of bidirectional free space laser transmission link is deduced and analyzed, and then the coaxial is correlated. The correlation coefficient is related to the location of transmission path. The probability density distribution of the optical signal collected by the experiment obeys the lognormal distribution, and the real-time change trend of the intensity of the speckle signal at the both receivers is same. Therefore, the atmospheric channel of the bidirectional free space laser transmission link is reciprocal. The conclusion of this paper is of great significance for realizing high-rate and low bit error rate transmission in atmospheric channel.

Proceedings Article | 17 May 2019 Paper

Research on nonlinear compensation technology of wireless optical communication system

Xinsong Xue, Mei Liu, Guangwen Liu, Zhi Liu, Xiaolong Ni

Proceedings Volume 11170, 1117031 (2019) https://doi.org/10.1117/12.2533879

KEYWORDS: Telecommunications, Nonlinear optics, Wireless communications, Light sources, Capacitance, Transistors, Signal attenuation, Modulation

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Proceedings Article | 5 March 2018 Paper

The research based on intelligent night-time elimination of "red explosion" and "white explosion" vehicle license plate capturing and identifying system

Tian-Yu Ren, Qing-Duo Duanmu, Jing Liu, Bo-Qi Wu

Proceedings Volume 10710, 107100F (2018) https://doi.org/10.1117/12.2316993

KEYWORDS: Cameras, Image segmentation, Image processing, Image filtering, Imaging systems, Laser applications, Roads, Optical filters, Intelligence systems, Detection and tracking algorithms

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Proceedings Article | 9 November 2016 Paper

Spectrum analysis of rectangular pulse in the atmospheric turbulence propagation

Yi Liu, Xiaolong Ni, Huilin Jiang, Junran Wang, Zhi Liu

Proceedings Volume 10017, 1001713 (2016) https://doi.org/10.1117/12.2245959

KEYWORDS: Atmospheric turbulence, Rectangular pulse, Atmospheric propagation, Interference (communication), Laser communications, Telecommunications, Laser systems engineering, Signal detection, Oscilloscopes, Photodetectors

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Proceedings Article | 9 December 2014 Paper

Research on the laser transmission characteristics simulation and comprehensive test in complex channel environment

Qiang Fu, Jianhua Liu, Xiaoman Wang, Huilin Jiang, Zhi Liu

Proceedings Volume 9294, 92940R (2014) https://doi.org/10.1117/12.2073137

KEYWORDS: Optical simulations, Atmospheric turbulence, Laser applications, Turbulence, Device simulation, Control systems, Body temperature, Atmospheric modeling, Control systems design, Cooling systems

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Proceedings Article | 20 November 2014 Paper

Partially coherent polarized atmospheric transmission characteristics and application technology research

Qiang Fu, Duorui Gao, Zhi Liu, Chunyi Chen, Yan Lou, Huilin Jiang

Proceedings Volume 9300, 93002A (2014) https://doi.org/10.1117/12.2073129

KEYWORDS: Turbulence, Atmospheric turbulence, Gaussian beams, Polarization, Atmospheric propagation, Receivers, Global system for mobile communications, Beam controllers, Atmospheric optics, Transmittance

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Based on partially coherent polarized light transmission characteristics of the atmosphere, an intensity expression of completely coherent flashing light is derived from Andrews scale modulation method. According to the generalized Huygens-Fresnel principle and Rytov theory, the phase fluctuation structure function is obtained on condition that the refractive index profile in the atmosphere meet Von Karman spectrum, then get the arrival Angle fluctuation variance. Through the RMS beam width of gaussian beams in turbulent atmosphere, deviation angle formula of fully coherent gaussian beams in turbulence atmosphere is attained, then get the RMS beam width of partially coherent and derivation angle expression of GSM beam in turbulent atmosphere. Combined with transmission properties of radial polarized laser beam, cross spectral density matrix of partially coherent radially polarized light can be gained by using generalized huygens-fresnel principle. And light intensity and polarization after transmission can be known according to the unity of coherence and polarization theory. On the basis of the analysis model and numerical simulation, the simulation results show that: the light spot caused by atmospheric turbulence of partially coherent polarization will be superior to completely polarized light.Taking advantage of this feature, designed a new wireless suppression technology of atmospheric turbulence, that is the optimization criterion of initial degree of coherent light beam. The optimal initial degree of coherent light beam will change along with the change of atmospheric turbulence conditions,make control the beam’s initial degree of coherence to realize the initial degree of coherence of light beam in real time and dynamic control. A spatial phase screen before emission aperture of fully coherent light is to generate the partially coherent light, liquid crystal spatial light modulator is is a preferable way to realize the dynamic random phase. Finally look future of the application research of partially coherent light.

Proceedings Article | 21 August 2013 Paper

Study of laser scintilla characteristics in the atmosphere

Qiang Fu, Chun-yi Chen, Hui-lin Jiang, Zhi Liu, Zheng Li

Proceedings Volume 8906, 890616 (2013) https://doi.org/10.1117/12.2033149

KEYWORDS: Scintillation, Turbulence, Atmospheric turbulence, Atmospheric modeling, Refractive index, Optical simulations, Atmospheric scintillation, Optical spheres, Atmospheric propagation, Spherical lenses

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Proceedings Article | 21 August 2013 Paper

Research on demodulation technology of atmospheric laser communication system base on CPolSK

zhou xin, Yan Liu, Zhi Liu, Dan Liu, Han-han Fang, Min Zheng

Proceedings Volume 8906, 890619 (2013) https://doi.org/10.1117/12.2033163

KEYWORDS: Telecommunications, Modulation, Polarization, Signal detection, Laser communications, Laser systems engineering, Demodulation, Receivers, Atmospheric optics, Optical communications

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Proceedings Article | 21 August 2013 Paper

Research on modulation properties of atmospheric wireless optical communication

Hanhan Fang, Yan Liu, Zhi Liu, Dan Liu, Xin Zhou

Proceedings Volume 8906, 89060W (2013) https://doi.org/10.1117/12.2032962

KEYWORDS: Modulation, Atmospheric optics, Polarization, Signal to noise ratio, Wireless communications, Laser communications, Head, Receivers, Telecommunications, Atmospheric turbulence

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Proceedings Article | 21 August 2013 Paper

Effect of light source parameters on the polarization properties of the beam

Dan Liu, Yan Liu, Hui-lin Jiang, Zhi Liu, Xin Zhou, Hanhan Fang

Proceedings Volume 8906, 89060U (2013) https://doi.org/10.1117/12.2032952

KEYWORDS: Polarization, Atmospheric propagation, Light sources, Atmospheric turbulence, Turbulence, Global system for mobile communications, Telecommunications, Free space optical communications, Beam propagation method, Laser beam propagation

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Proceedings Article | 2 February 2006 Paper

Laser communications technology with airborne platform

Huilin Jiang, Guojun Liu, Fuchang Yin, Zhi Liu

Proceedings Volume 6031, 603102 (2006) https://doi.org/10.1117/12.667892

KEYWORDS: Laser communications, Telecommunications, Airborne laser technology, Control systems, Laser applications, Laser systems engineering, Stanford Linear Collider, Data communications, Satellite communications, Satellites

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Proceedings Article | 2 February 2006 Paper

Interface technology of precise-tracking camera in optical communication of space

Shuchang Liu, Zhi Liu

Proceedings Volume 6031, 60311A (2006) https://doi.org/10.1117/12.668051

KEYWORDS: Cameras, Optical communications, Interfaces, Astronomical imaging, Telecommunications, Imaging systems, Digital signal processing, Control systems, Digital imaging, Laser communications

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Proceedings Article | 20 January 2006 Paper

Research on application of several tracking detectors in APT system

Zhi Liu

Proceedings Volume 6027, 60272S (2006) https://doi.org/10.1117/12.668300

KEYWORDS: Charge-coupled devices, Sensors, Imaging systems, CMOS sensors, Telecommunications, CCD image sensors, Image sensors, Optical amplifiers, Signal to noise ratio, Laser communications

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Proceedings Article | 14 February 2005 Paper

Study on sub-pixel measurement accuracy of CMOS imager

Zhi Liu

Proceedings Volume 5634, (2005) https://doi.org/10.1117/12.574292

KEYWORDS: Imaging systems, Image sensors, Image resolution, Digital cameras, Light sources, CCD image sensors, Charge-coupled devices, Reflectors, Digital imaging, CMOS sensors

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Proceedings Article | 8 February 2005 Paper

Face detection based on color adaptation

Jin Duan, Xiaoman Wang, Chunguang Zhou, Xiaohua Liu, Zhi Liu

Proceedings Volume 5637, (2005) https://doi.org/10.1117/12.569369

KEYWORDS: Skin, RGB color model, Facial recognition systems, Image segmentation, Roentgenium, Video, Light sources and illumination, Reliability, Image processing algorithms and systems, Colorimetry

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Proceedings Article | 20 January 2005 Paper

A safety monitoring system for taxi based on CMOS imager

Zhi Liu

Proceedings Volume 5633, (2005) https://doi.org/10.1117/12.576863

KEYWORDS: Imaging systems, Safety, Sensors, Infrared imaging, Infrared radiation, CMOS sensors, Human-machine interfaces, CCD image sensors, Image acquisition, Light sources

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Proceedings Article | 20 January 2005 Paper

Research on application of several tracking detectors in APT system

Zhi Liu

Proceedings Volume 5633, (2005) https://doi.org/10.1117/12.576885

KEYWORDS: Charge-coupled devices, Imaging systems, Sensors, Telecommunications, CMOS sensors, CCD image sensors, Image sensors, Optical amplifiers, Signal to noise ratio, Laser communications

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Proceedings Article | 2 November 2003 Paper

Study on APT subsystem in optical communication link between the GEO and airplane

Shou-feng Tong, Zhi Liu, Yuegang Fu, Huiling Jiang

Proceedings Volume 5284, (2003) https://doi.org/10.1117/12.522434

KEYWORDS: Telecommunications, Optical communications, Sensors, Mirrors, Telescopes, Laser communications, Satellite communications, Satellites, Receivers, Optical filtering

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Proceedings Article | 20 September 2002 Paper

Application of CMOS APS in star tracker

Zhi Liu, Yefan Wang, Jingyi Yang, Zhihang Hao

Proceedings Volume 4919, (2002) https://doi.org/10.1117/12.471883

KEYWORDS: Stars, Sensors, CMOS sensors, Cameras, Satellites, Prototyping, CCD image sensors, CMOS cameras, CMOS technology, Image processing

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Proceedings Article | 20 September 2002 Paper

Multisensor data fusion in laser target identification system

Xiaoman Wang, Jingyi Yang, Zhi Liu, Ye Wang, Yue Jia

Proceedings Volume 4919, (2002) https://doi.org/10.1117/12.471889

KEYWORDS: Sensors, Target recognition, System identification, Data fusion, Laser systems engineering, Reliability, Signal to noise ratio, Control systems design, Signal detection, Laser applications

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Proceedings Article | 20 September 2002 Paper

CMOS APS digital camera based on enhanced parallel port

Zhi Liu, Jingyi Yang, Yefan Wang, Zhihang Hao

Proceedings Volume 4919, (2002) https://doi.org/10.1117/12.471882

KEYWORDS: Cameras, Digital cameras, Image processing, Digital imaging, Imaging systems, CMOS sensors, Digital image processing, Image quality, Interfaces, Image sensors

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Proceedings Article | 9 September 2002 Paper

Temperature radiation measurement with optical fiber sensor

Jingyi Yang, Yulan Zhang, Zhi Liu

Proceedings Volume 4920, (2002) https://doi.org/10.1117/12.481945

KEYWORDS: Sensors, Temperature metrology, Fiber optics sensors, Infrared radiation, Optical fibers, Black bodies, Infrared sensors, Optical testing, Infrared detectors, Target detection

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Proceedings Article | 5 October 2000 Paper

Photoelectric soft x-ray multilayer coating thickness control system

Xuan Ming, Bin Chen, Zhi Liu

Proceedings Volume 4223, (2000) https://doi.org/10.1117/12.401769

KEYWORDS: Control systems, Coating, X-rays, Sputter deposition, Signal detection, Computing systems, Signal processing, Reliability, Target detection, Ion beams

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Showing 5 of 27 publications

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