| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系研究所 === 102 === Optical communication systems have been deployed widely with high expectations to provide broadband integrated services. With the rapid development of communication technologies, the increasing requirements raise the needs for high-speed and high bandwidth, not only for the single-mode fiber (SMF)-based backbone networks, but also for the free-space visible light communication (VLC)-based in-building ones. However, when the SMF is deployed toward in-building networks, installation cost and convenience are beyond disputed issues needed to be solved. To overcome the challenge, a new kind of in-building network medium is required. Recently, free-space VLC system is presently developed by researchers and engineers to create high-speed communication networks, by which using visible light to replace radio-frequency (RF) and microwave signals. It can provide many benefits, like providing communication links in specific areas in which RF communication is prohibited, such as in a hospital or in an airplane . This brilliant system is the potential candidate to solve the problem of in-building connection. In result, free-space VLC is an ideal scheme to integrate fiber backbone networks and in-building ones.
This study proposed four visible light communication systems. First is a two way visible light communication system, and provide demand of high bandwidth and long transmission distance. Then employ a single optical channel can increase to 2.5Gbps and the distance extended to 15 meters. The third structure is use a single optical channel increased to 10Gbps. Finally, even a combination of 10Gbps OFDM signals and CATV signal for data transmission in free-space .
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