Chinese Optics Letters, 2008, 6 (11): 797, Published Online: Nov. 17, 2008
Improved free space optical communications performance by using time diversity Download: 620次
自由空间光通信 大气传输 大气湍流 060.2605 Free-space optical communication 010.1300 Atmospheric propagation 010.1330 Atmospheric turbulence
Abstract
A laser beam propagating through turbulence experiences random amplitude and phase fluctuations, which can severely degrade the performance of free space optical communication systems. In this letter, time diversity is demonstrated as a technique which can decrease turbulence influence. Statistically, laser propagation along an atmospheric path is uncorrelated with an earlier-time path for a time interval greater than the atmospheric turbulence correlation time. To estimate time diversity system performance, a 2.2-km optical link is set up for comparing the fade probability of a system using time diversity with a system not using time diversity. The experimental results obtained under different turbulence conditions are shown which are in good agreement with the theory.
Jing Chen, Yong Ai, Ying Tan. Improved free space optical communications performance by using time diversity[J]. Chinese Optics Letters, 2008, 6(11): 797.