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Proceedings Paper

Error rate performance of atmospheric laser communication based on bubble model
Author(s): Ke Xu; Jin Wang; Yan Li
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Paper Abstract

Free-Space Optics (FSO) can provide an effective line-of-sight and wireless communication with high bandwidth over a short distance. As a promising field of wireless communication, FSO is being accepted as an alternative of the more expensive fiber-optic based solutions. Despite the advantages of FSO, atmospheric turbulence has a significant impact on laser beam propagating through the channel in the atmosphere over a long distance. Turbulent eddies of various size and refractive index result in intensity scintillation and phase wander, which can severely impair the quality of FSO communication system. In this paper, a new geometrical model is used to assess the effects of turbulence on laser beam in its propagation path. The atmosphere is modeled along the transmission path filled with spatial-distributed spherical bubbles. The size and refractive index discontinuity of each bubble is K-distributed. This Monte Carlo technique allows us to estimate the fluctuation of intensity and phase shifts along the path. A pair of uncollimated rays arrives at the receiver through different path, and an optical path difference is produced. This difference causes a delay between the two rays. At the receiver, as the two rays are superposed, the delay ultimately affects the judgement of the bits. In the simulation, we assume that when the delay exceeds half of the bit width, bit error is possible. On the contrary, when the delay is less than the bit width, the bit error will not happen. Based on this assumption, we calculate the BER under different conditions, and results are further analyzed.

Paper Details

Date Published: 27 October 2009
PDF: 10 pages
Proc. SPIE 7516, Photonics and Optoelectronics Meetings (POEM) 2009: Optoelectronic Devices and Integration, 751605 (27 October 2009); doi: 10.1117/12.843166
Show Author Affiliations
Ke Xu, Huazhong Univ. of Science and Technology (China)
Jin Wang, Huazhong Univ. of Science and Technology (China)
Yan Li, Chongqing Univ. of Technology (China)


Published in SPIE Proceedings Vol. 7516:
Photonics and Optoelectronics Meetings (POEM) 2009: Optoelectronic Devices and Integration
Zishen Zhao; Ray T. Chen; Yong Chen; Jinzhong Yu; Junqiang Sun; Weiwei Dong, Editor(s)

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