| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系研究所 === 104 === At present, free-space optical (FSO) communications are being developed to create high-speed,high security, and friendly communications employing high bandwidth and high capacity light signal instead of traditional RF communications. FSO communications have many attractive characteristics, such as worldwide available and license-free bandwidth, non-interference with radio bands, and the promotion of multi Gigabit optical wireless applications by facilitating flexibility through free-space transmissions. Therefore, the development of FSO communications is expected to overcome the wireless connection issues. For a real and practical implementation of FSO communication, long transmission distance and high transmission rate are the major interests of system designers. In this paper, a 320 Gbps FSO communication with afocal scheme and dense wavelength-division-multiplexing (DWDM) technology is proposed. The free-space transmission distance is greatly increased by the afocal scheme, and the free-space transmission rate is significantly enhanced by the DWDM technology. A DWDM FSO communication over a 50 m free-space link with a total transmission rate of 320 Gbps (40 Gbps/λ x 8 λ = 320 Gbps) is obtained. With the help of low noise amplifier (LNA) and clock/data recovery (CDR) at the receiving site, good bit error rate (BER) performance and clear eye diagram are achieved at a 50 m/320 Gbps operation. Such proposed 50 m/320 Gbps DWDM FSO communication is shown to be a prominent one not only provides the advantages of optical wireless communications for long transmission distance and high transmission rate but reveals its feasibility for long-haul and high-speed light-based WiFi (LiFi) applications.
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