The Design And Implementation Of The GPON System User Terminal Based On MIPS

Now to improve the quality of people’s lives, traditional communications business functions, such as phone calls and watching TV, have already been unable to meet their needs. With the rapid development of information networks, some emerging business services are gradually coming into people’s view, for example, high-speed computer communications, home networks, shopping, distance learning and medical care, but it is difficult to achieve them with copper and twisted-pair. So optical fiber communications stand out in the field of optical communications by its large capacity, low attenuation, anti-interference ability, and then have become one of the main means of transmission of the modern information network. People always have been concerned with FTTx, but because of the maturity and development of EPON/GPON technology, Fiber-to-the-home(FTTH) becomes a hot spot once again after yeas of silence, and then enters a rapid development period.This topic is a project from Wuhan HG GENUINE Photonic Technology Co.,Ltd, and we take GPON system as our background, and our focus is mainly research and development of the terminal equipment of the user side. Currently people don’t meet the demand for bandwidth, so they start to support GPON system because of the maturity of technology. However, costs of the user terminal equipment, specially the cost of optical module, are still restricting further development of the FTTH. The key to solve the problem is to reduce costs of the user terminal equipment in order to promote GPON system. So in this paper, we improve the original design and achieve low-cost, fully functional purpose.First of all, I talk about the research background briefly in the first two chapters, for instance, the purpose and significance of the research, and the background, architecture, a series of standards of GPON system, and the design description.Secondly, the middle two chapters is the core chapters of the thesis, and I begin the optical module from both hardware and software in the new design. With the thinking of the BOB technology, I can finish to connect the optical driver and the laser driver to the main processor, and communicate via I2C. At the same time I make some changes in the SFF-8472agreement, and I can use the text file to store the initial data and collecting data. Also I can see the result by calibrated in the screen clearly, in this way, I can configurate and modify the parameters so that I will complete the digital diagnostic function. On the other hand, I can build a test platform in the improved design, and test the new optical module by transmitting and receiving. Of course, I must record those data detailedly.Finally, the last chapter is the conclusion, and the new improved design is feasible certainly. I can see the fast development of GPON system but shall continue to improve our technology, in this way, products will be more perfect.