A Hybrid Optical Fiber and FSO System for Bidirectional Communications Used in Bridges

Yi-Lin Yu, Shien-Kuei Liaw, Hsi-Hsir Chou, Hoa Le-Minh, Zabih Ghassemlooy
2015 IEEE Photonics Journal  
In this paper, a 10-Gb/s hybrid optical fiber (OF) and free-space optics (FSO) link as part of a bidirectional long-haul OF transmission for application in outdoor environments such as bridges is proposed. A fiber-Bragg-grating (FBG) sensor head is used for monitoring the condition of a bridge, and in the case of the bridge being damaged, the transmission path is changed over from OF to the FSO link to ensure link connectivity. An Erbium-doped fiber amplifier is used to compensate for losses
more » ... nsate for losses due to the fiber cable and the free-space channel. At a bit error rate (BER) of 10e-9, the power penalty between the OF and FSO paths is < 1 dB, and the power variations for both paths are ±0.07 and ±0.12 dB, respectively. Index Terms: Free space optics, erbium doped fiber amplifier, fiber sensor, long-haul transmission system.
doi:10.1109/jphot.2015.2488286 fatcat:wjfftvcolvep7jqdkj4od23rdm