Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment

Conference object English OPEN
Lee, I. E. ; Ghassemlooy, Z. ; Ng, W. P. ; Gourdel, V. ; Khalighi, M. A. ; Zvanovec, S. ; Uysal, Murat (2014)
  • Publisher: IEEE
  • Related identifiers: doi: 10.1109/CSNDSP.2014.6923856
  • Subject: Free-space optical (FSO) communications | Fog attenuation | Hard switching | Hybrid FSO/RF link

Due to copyright restrictions, the access to the full text of this article is only available via subscription. The availability and performance of terrestrial free-space optical (FSO) communication systems are heavily deterred by the fluctuating conditions of the atmospheric channel, particularly in the presence of visibility-limiting fog effects. In this paper, we examine the viability of deploying hybrid FSO and radio frequency (RF) links through an experimental study, which takes advantage of a dedicated laboratory atmospheric chamber to emulate the fog scenarios encountered on outdoor environment. In particular, a root mean square power detector is developed and introduced in the system under study to monitor the signal quality of the primary FSO link. The quasi-linear output voltage characteristics of the power detector device is utilized as a useful decision metric to implement hard switching in a hybrid FSO/RF link based upon the changes in the visibility. Our measurement results reveal that the selection of a desirable threshold voltage is dependent upon the intended data rate and minimum achievable bit error rate, in order to enable effective switching between the FSO and RF links. European Commission
Share - Bookmark