A Hybrid BB/MW/MMW Optical Transport System

• Main Authors: Jian-Ying Wen, 溫建穎
• Other Authors: Hai-Han Lu
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/fygyg7

碩士 === 國立臺北科技大學 === 光電工程系研究所 === 101 === In recent years, due to the rapid development of smart phones, smart table and Cloud Computing technology. The demands on wire and wireless capacity have grown rapidly. In order to bear huge amount of data, we need to improve the existing transmission system. In this thesis, we propose two different optical transport systems. No matter which architectures, the goal is to achieve RoF and FTTH. In order to improve the transmission quality, we use different architectures to achieve this goal. First, by cascading a phase modulator (PM) and a Mach-Zehnder modulator (MZM) to generate multiple coherent lightwaves, hybrid 1.25Gbps baseband (BB), 1.25Gbps/20GHz microwave (MW), and 1.25Gbps/40GHz millimeter-wave (MMW) downstream signals and a 1.25Gbps BB upstream signal are simultaneously transmitted. Furthermore, with an assistance of an optical signal to noise ratio (OSNR) enhancement circuit, sufficient low bit error rate (BER) values are experimentally achieved for both down-link BB/MW/MMW and up-link BB signals. No additional high-frequency local oscillator, mixers and upstream laser diode are required in both transmitter and receiver sites. Under this architecture, both wire-lined and wireless clients can be simultaneously served without using any extra device/equipment to convert the downstream signals among BB, MW and MMW formats. The hybrid three-band lightwave transport system will be an attractive candidate to provide broadband wire-lined and wireless integrated services including the Internet, telecommunication and digital CATV services. Second, A full-duplex lightwave transport system employing intensity-modulated CATV, phase-modulated RoF, and intensity-remodulated 16-QAM OFDM signals over two 20-km SMFs links is proposed and demonstrated. Good performances of CNR, CSO, and CTB are obtained for CATV signal transmission, as well as low BER values are achieved for RoF and 16-QAM OFDM applications. Our proposed systems present brilliant performances characteristic in transmitting hybrid CATV/RoF/16-QAM OFDM signals over fiber links.