Research On Technologies Of 100G Ethernet Physical Layer Optical Transmission

During the last thirty years, Ethernet has become the chief IP bearer technol-ogy because of its advantages of low-cost, high-reliability, easily-installed and conveniently-maintain. With the development of Internet and E-commerce, greater bandwidth is required to meet the requirement of growing enterprises and customers. And in the past decade, the flowrate of Internet doubles every twelve months, which will keep going in future. The telecom-based applica-tions of Ethernet also need greater aggregate bandwidth. Therefore, the 10G Ethernet can hardly satisfy the fast growing need. It is high time to develop next generation 100G Ethernet.In this research, firstly, we introduce roadmap of 100G Ethernet standlization and product modules and demoes for 100GE that service providers and man-ufacturers published. Through this, the background and meaning of this re-search is made clear. Secondly, there is an introduction about optical fiber characteristics which influence the performance of high-speed optical com-munication systems, such as attenuation, chromatic dispersion, polarization mode dispersion and nonlinear effects. Also the solutions are included. Then we stress our research on two kinds of 100GE physical layer transmission (including 100G DQPSK modulation serial transmission and 4X25G duobi-nary modulation parallel transmission). Three methods to implement 100G DQPSK modulation serial transmission are analyzed and some characteristics are analyzed by setting up simulation systems. Finally 50 Gb/s PRBS signal Mux/Demux modules, modulation transmitter module and transmission mod-ule are displayed. Using these modules, we set up 50Gb/s PRBS intensity modulation transmission and 25Gb/s PRBS duobinary transmission systems. These works contribute a lot to the establishment of experimental verification system of 100GE optical interface and transmission technology.The innovative parts of this thesis are as follows1. Three ways to realize RZ-DQPSK are analyzed. Simulation models are build to analyze the four characteristics such as attenuation, chromatic disper-sion, polarization mode dispersion and nonlinear effects. And a comparison of different modulations is given, which can let us know their advantages, dis-advantages and utilities. 2. Signal multiplexing from 12.5Gb/s PRBS to 50Gb/s PRBS is realized. De-sign and package of communication devices modules are accomplished, which make a great contribution to the following 100Gb/s DQPSK experi-mental system.3. Implement 50Gb/s PRBS intensity modulation transmission experiment and 25Gb/s PRBS duobinary modulation transmission experiment. Get useful datas and eye diagrams.