Shien-Kuei Peter Liaw
In this talk, high-speed free space optics communication (FSO) technologies will be reviewed and introduced. We design and demonstrate two proposed FSO schemes. The first scheme is a bi-directional, short-range and free-space optical (FSO) communication with 2x4x10 Gb/s capacity in wavelength division multiplexing (WDM) channels for short-distance transmission. Compared to the backto- back link and uni-directional transmission system, the measured power penalties for bi-directional, four-channel WDM FSO communication are less than 0.8 dB and 0.2 dB, respectively. The second scheme is the hybrid optical fiber and FSO link for outdoor environment, such as cross bridge or inter-building system. In case that the bridge breaks, the transmission path can be switched from fiber link to FSO link to ensure the connectivity of data link. In both cases, the single-mode-fiber (SMF) components are used in the optical terminals for both optical transmission and receiving functions. The environmental and infrastructure factors including window glasses, air turbulence and rainfall that influence the case will also be addressed. The air turbulence induces extra transmission loss and instability in the received power. We found that raindrops are the most influential environmental factor. The bit error rate (BER) test shows that raindrops seriously increase the BER that may interrupt the transmission instantaneously. After appropriate performance improvement, the proposed transmission structures show potential applications for outdoor transmission under various natural weather conditions.
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