Simulation study on fiber-coupling efficiency for quantum communication through atmospheric turbulence

Xuejun Long; Bo Qi; Ge Ren; Sanhong Wang; Haotong Ma; Jiang Bian

doi:10.1117/12.2065310

3 February 2015 Simulation study on fiber-coupling efficiency for quantum communication through atmospheric turbulence

Xuejun Long, Bo Qi, Ge Ren, Sanhong Wang, Haotong Ma, Jiang Bian

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92553M (2015) https://doi.org/10.1117/12.2065310
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

Quantum communication is a high secure and high efficiency communication method. The received laser beam in the quantum communication system must be coupled into the fibers, by which the communication signal can be detected, amplified and processed for the latter devices. However, atmospheric turbulence will degrade the spatial coherence of the laser beam and limits the fiber- coupling efficiency. In the paper, the propagation model of the laser beam through atmospheric turbulence is established and the fiber-coupling efficiency for the laser beam distorted by atmospheric turbulence is evaluated, and the optimal coupling geometry parameter a=1.12 is given, with which the theoretical maximal coupling efficiency is reached. Then the relationship between the atmospheric coherence constant r₀ and the fiber-coupling efficiency is analyzed. The simulation also indicates that the fast steering mirror (FSM) can reduce the influence of the atmospheric turbulence and improve the coupling efficiency distinctly.

Citation Download Citation

Xuejun Long, Bo Qi, Ge Ren, Sanhong Wang, Haotong Ma, and Jiang Bian "Simulation study on fiber-coupling efficiency for quantum communication through atmospheric turbulence", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92553M (3 February 2015); https://doi.org/10.1117/12.2065310

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KEYWORDS

Atmospheric turbulence

Atmospheric modeling

Quantum communications

Multimode fibers

Quantum efficiency

Signal detection

Single mode fibers

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