Volume 48 Issue 6
Jul.  2019
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Guo Shuhuai, Wang Tianhe, Ji Xia, Dang Ying, Lv Xie. Link loss of the free space optical communications of real-time transmission with 1 Gbps[J]. Infrared and Laser Engineering, 2019, 48(6): 622004-0622004(7). doi: 10.3788/IRLA201948.0622004
Citation: Guo Shuhuai, Wang Tianhe, Ji Xia, Dang Ying, Lv Xie. Link loss of the free space optical communications of real-time transmission with 1 Gbps[J]. Infrared and Laser Engineering, 2019, 48(6): 622004-0622004(7). doi: 10.3788/IRLA201948.0622004

Link loss of the free space optical communications of real-time transmission with 1 Gbps

doi: 10.3788/IRLA201948.0622004
  • Received Date: 2019-01-11
  • Rev Recd Date: 2019-02-21
  • Publish Date: 2019-06-25
  • The biggest challenge for free space optical(FSO) communication systems is the attenuation/fluctuation of light intensity caused by influence of atmospheric turbulence in long distance communication, resulting in communication link interruption. A method to calculate the link loss due to atmospheric turbulence, based on lognormal statistics of the received power, was presented. It can be used to evaluate the system parameters in FSO communication system. The effects of different intensity turbulence were simulated, and the relationship between optical communication link loss and transmission distance at 850 nm and 1 550 nm wavelengths at receiving terminals of 2 cm and 20 cm was obtained. Then the simulated analysis results were used to design a FSO communication system with a receiving aperture of 20 cm, which could transmit HD image and video at a distance of about 2 km under strong turbulence conditions. The transmission rate of the FSO communication system was 1 Gpbs which could meet the sharpness and real-time performance of large amount of uncompressed data transmission compared with the 4 G networks.
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Link loss of the free space optical communications of real-time transmission with 1 Gbps

doi: 10.3788/IRLA201948.0622004
  • 1. Xingtai Medical College,Xingtai 054000,China;
  • 2. Tianjin Jinhang Institute of Technical Physics,Tianjin 300308,China

Abstract: The biggest challenge for free space optical(FSO) communication systems is the attenuation/fluctuation of light intensity caused by influence of atmospheric turbulence in long distance communication, resulting in communication link interruption. A method to calculate the link loss due to atmospheric turbulence, based on lognormal statistics of the received power, was presented. It can be used to evaluate the system parameters in FSO communication system. The effects of different intensity turbulence were simulated, and the relationship between optical communication link loss and transmission distance at 850 nm and 1 550 nm wavelengths at receiving terminals of 2 cm and 20 cm was obtained. Then the simulated analysis results were used to design a FSO communication system with a receiving aperture of 20 cm, which could transmit HD image and video at a distance of about 2 km under strong turbulence conditions. The transmission rate of the FSO communication system was 1 Gpbs which could meet the sharpness and real-time performance of large amount of uncompressed data transmission compared with the 4 G networks.

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