Experimental investigation of optimum beam size for FSO uplink

OPTICS COMMUNICATIONS

卷:400

Article

Kaushal, Hemani¹  Kaddoum, Georges²  Jain, Virander Kumar³  Kar, Subrat³ 

[1] NorthCap Univ, Dept Elect Elect & Commun Engn, Gurgaon, Haryana, India

[2] Ecole Technol Super, Dept Genie Elect, Montreal, PQ, Canada

[3] Indian Inst Technol Delhi, Elect Engn Dept, New Delhi, India

关键词: Turbulence;    Beam wander;    Free space optical communication;    Bit error rate;    Scintillation;    OTG chamber;    Pointing error;   

DOI  :  10.1016/j.optcom.2017.05.009

来源: Elsevier

【 摘 要 】

In this paper, the effect of transmitter beam size on the performance of free space optical (FSO) communication has been determined experimentally. Irradiance profile for varying turbulence strength is obtained using optical turbulence generating (OTG) chamber inside laboratory environment. Based on the results, an optimum beam size is investigated using the semi-analytical method. Moreover, the combined effects of atmospheric scintillation and beam wander induced pointing errors are considered in order to determine the optimum beam size that minimizes the bit error rate (BER) of the system for a fixed transmitter power and link length. The results show that the optimum beam size for FSO uplink depends upon Fried parameter and outer scale of the turbulence. Further, it is observed that the optimum beam size increases with the increase in zenith angle but has negligible effect with the increase in fade threshold level at low turbulence levels and has a marginal effect at high turbulence levels. Finally, the obtained outcome is useful for FSO system design and BER performance analysis. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free