Abstract:

Using the atmospheric turbulence simulator used in optical transmission experiments, characteristics of optical transmission are measured. Two methods such as the fluctuation of beam’s arrival angle and the intensity of beam’s scintillation are used to measure the characteristics in the experiment . Results show that, the range of Fried coherence length is 0.7~40 cm when the difference in temperature is 1~200 ℃, and the frequency of arrival angle fluctuation spectrum ranges can be up to100 Hz when the difference in temperature is 200 ℃. The scintillation intensity frequency is up to 100 Hz, feature speed of turbulence is about 0.1 m/s, and the outer scale is about 20 cm. All the tested performances of turbulence simulator are relatively close to the actual atmospheric turbulence’s performance, and the turbulence intensity also has good stability and controllability. So both of them can satisfy the needs of optical transmission experiments.

Key words: atmospheric turbulence, scintillation of beam, coherence length, arrival angle fluctuation, outer scale