Mr. Hong-Kun yang Profile

Hong-Kun yang

at Changchun Univ of Science and Technology

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Publications (3)

PROCEEDINGS ARTICLE | August 21, 2013

The research of high efficient optical fiber coupling technology in space laser communication

Proc. SPIE. 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems

KEYWORDS: Refractive index, Statistical analysis, Aerospace engineering, Single mode fibers, Turbulence, Fiber couplers, Atmospheric turbulence, Fiber optic communications, Electromagnetism, Free space optical communications

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With the development of optical fiber communications, especially the maturity of the optical amplifiers and the WDM technology, space optical communication at 1550 nm becomes a promising solution for future high speed satellite communication. Receiving technology with optical amplifiers and coupling space light into single mode fiber are key technologies in space optical communication at 1550 nm. Free-space-to-fiber coupling technique investigated in this paper is the first challenge of applying fiber communication techniques to free space optical communications. We analyzed the factors that affect the efficiency of free-space-to single-mode-fiber coupling based on mode-matching theory of electromagnetic fields. On this objective, in this paper, the theoretical analysis of the effect of atmospheric turbulence on the space light-single mode fiber coupling efficiency is discussed. On this basis, the short-distance experiment coupling space light into single mode fiber is carried out. 1. The main factors affecting the process coupling space light into single mode fiber are analyzed. This paper introduced the statistical theory of atmospheric turbulence and gave out the main turbulence parameters and meteyard based on the theory of the space light-single mode fiber coupling efficiency under ideal conditions. 2. The influence of atmospheric turbulence on the space light-single mode fiber coupling efficiency is analyzed and simulated. In the weak turbulence condition, mathematical model of the mean coupling efficiency and its fluctuation variance was given. And the fluctuation variance of coupling efficiency was simulated studied under the atmospheric conditions. The influences on the average coupling efficiency was theoretically studied, which were induced by the structure constant of atmospheric refractive index, the diameter of coupling lens and the single-mode fiber mode field radius. 3. Validating the theoretical model by a experiment under a short link coupling condition. The results of this paper lay the theoretical and experimental foundation for indeed establishing the efficient space light-single mode fiber coupling systems.

PROCEEDINGS ARTICLE | August 21, 2013

Based on ground station adaptive optics for laser communications demonstration platform structures

Proc. SPIE. 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems

KEYWORDS: Adaptive optics, Control systems, Telecommunications, Zernike polynomials, Optical communications, Liquid crystals, Atmospheric turbulence, Laser communications, Atmospheric optics, Laser systems engineering

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With the rapid development of modern science and technology in astronomical imaging, optical communications, optical radar, optical information processing, high-precision ranging, tracking, guidance, and remote sensing, light waves propagating in the medium, especially in the turbulent atmosphere spread more and more important. Atmospheric turbulence is one of the main factors which have influence on the performance of a laser communication system. Adaptive optics technology is an important means to solve the problem of atmospheric turbulence. This paper states how adaptive optics technique can be used in space laser communication system to compensate atmospheric turbulence when laser beam transmission through it. The core content of adaptive optics is correct laser beam wave-front disturbance in real-time，with it to enhance optical system imaging quality and the next aim is reach the level of diffraction limitation. Adaptive optics system consists of wave-front detection， wave-front control and wave-front correction . The demo platform including: atmospheric turbulence simulation unit、adaptive correction unit、signal transmitting and receiving unit. Liquid crystal spatial light modulator applications in adaptive optics system and the turbulence simulation system introduced. And used zernike polynomials method to produce atmospheric turbulence phase screen simulation analysis. Simulation results show that: in the low spatial frequency components, the atmospheric turbulence phase screen generated by Zernike polynomial method consistent with the theoretical values, but in the high spatial frequency components, the simulation results with large difference between the theoretical values. In addition, the simulation results also show that: we can change the distribution of turbulence in the atmospheric turbulence phase screen by increasing the Zernike polynomials of orders or change the receiving apertures, but to calculate the large calculate the complex and other shortcomings. If adaptive optics technique can be applied in space laser communication system and is proved by practice， must make a space laser communication system performance has greatly improved.

PROCEEDINGS ARTICLE | August 21, 2013

The research of high-speed clock in space laser communication

Proc. SPIE. 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems

KEYWORDS: Oscillators, Clocks, Aerospace engineering, Imaging systems, Reliability, Power supplies, Telecommunications, Signal processing, Laser communications, Voltage controlled current source

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