Dr. Xiaolong Ni Profile

Dr. Xiaolong Ni

at Changchun Univ of Science and Technology

SPIE Involvement:

Author

Publications (5)

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

Read Abstract +

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

Read Abstract +

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

Read Abstract +

Proceedings Article | 7 November 2018 Paper

Cascaded constant modulus equalization algorithm in wireless optical communication systems

Ce Meng, Haifeng Yao, Zhi Liu, Xiaolong Ni, Xinsong Xue

Proceedings Volume 10832, 1083219 (2018) https://doi.org/10.1117/12.2511376

KEYWORDS: Telecommunications, Signal processing, Signal detection, Atmospheric optics, Atmospheric modeling, Detection and tracking algorithms, Wireless communications, Atmospheric particles, Interference (communication), Sensors

Read Abstract +

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

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years