| Due to the tremendous development of technology, voice and fiber in the world of the widely used over the last decade in the core transport network transmission capacity has been a huge increase. Commercial 1Tb/s transmission system can be set only on the shelf equipment can be achieved, the most advanced technologies available optical transmission technology can be achieved 10Tb/s. At the same time on the client, digital devices and computer performance started the great advances made possible by multi-media services, these multimedia services including video on demand, video conferencing, high-definition television (HDTV), online learning, online games, Internet chat, and more. This will result in the in the near future each user will need more than 30Mb/s bandwidth of the fundamental. However, the existing bridge users and the use of copper core network technology has reached the limit of the bandwidth and thus triggered the so-called last-mile bottleneck.PON technology is an important realization of FTTx technologies. So far, two kinds of using time-division multiplexing PON technology EPON and GPON are large-scale application. According to ITU-T G.984 for GPON is widely used in the United States and Europe, according to the Ethernet First Mile standard-IEEE 802.3ah for EPON is widely used in Japan and South Korea. The majority view that the overall wire-speed TDMA PON (although he has a total bit rate increased to 10 Gb/s trends, such as the so-called 10 GEPON) and power budget can not meet the needs of the future network development. PON power budget is not only limited the splitter ratio, but also limits the distance from the OLT to the ONU. Passive 1:N splitter in use will cause serious wear and tear (for example, the introduction of a 1:32 of the splitter insertion/split loss greater than 17dB) and to limit the length of the connection can be achieved. These issues will be with the wavelength division multiplexing passive optical networks (WDM-PON) the introduction of ease. In the WDM-PON, each ONU is assigned a single wavelength, which will provide greater bandwidth for each ONU. And each ONU can operate at its own rate rather than the overall (WDM) rate. Since each ONU through the physical wavelengths are separated, so network security and network convergence problem can be fundamentally solved. Another is that WDM-PON insertion loss than the TDM-PON to shunt a small loss.Spectral-slicing WDM-PON technology is the realization of a key technology, because of its simple structure and relatively low cost has attracted a large number of domestic and foreign studies, but the spectral-slicing WDM-PON has always been faced with budget shortfalls and the high cost of power challenges. This issue split the spectrum LED-based WDM-PON system, the power budget, adequate and relatively inexpensive. At the same time at home and abroad for the partition properties of the spectrum has a certain theoretical basis for research, but the lack of experimental support. The experimental platform based on subjects carried out a variety of features in-depth and comprehensive experiments.This topic is the National Natural Science Foundation of China: "Intelligent Optical Access key technologies" (60,672,025) one of the study. Author of this article during the post-graduate WDM-PON optical access network is mainly engaged in the research, and as one of the researchers involved in the spectrum WDM-PON optical access network test platform for the construction work. Results of the work during this period are:A systematic study of the development of optical access network at home and abroad, focusing on the spectrum wavelength division multiplexing passive optical networks (WDM-PON) to international developments, and analysis of its characteristics and advantages; 1. Participate in the National Natural Science Foundation of China: "Intelligent Optical Access key technology research", the main research spectrum split WDM-PON system research, including its key technologies, network programs, the main factors affecting its performance and to improve the spectrum split WDM-PON system, the primary method.2. Built spectral-slicing WDM-PON experimental environment which based on LED/SLD light source. In the case of coarse WDM optical line power budget, the system has a better sensitivity. In the case of dense wavelength division after adding amplifier power budget, the system sensitivity is acceptable. This verified with the use of low-cost light source and receiving devices, WDM-PON system has practical feasibility.3. In the experimental of the spectral-slicing WDM-PON system, the author did a large number of experiments about performance, including crosstalk, dispersion, power budget, sensitivity. Compare with theoretical analysis, I obtained a more convincing result of impact indicators.4. Dense WDM-PON system using LED/SLD light source power facing budget shortfalls and the system the problem of low sensitivity, this paper adopts the EDFA as a pre-amplification and line amplification to improve the spectral-slicing WDM system performance. Use theoretical analysis and experimental measurement to analysis system. This paper also analysis the amplifying performance when joining the post-EDFA performance and noise caused by the size of EDFA.This article is the author's theory during the post-graduate study and a summary of the actual research and development, divided into the following five chapters:Chapter I deals with some background knowledge of the research, and the author of some of the work during graduate the content and outcomes;Chapter II describes the spectral-slicing technology in the application of WDM systems, the main study the principles of WDM-PON systems, network programs and key technologies, followed by the study of the spectral-slicing technology with WDM-PON system combines applications;Chapter III testes CWDM and DWDM performance indicators to verify the feasibility of the system with the use of experimental conditions, construction of which is based on LED/SLD spectrum split WDM-PON system;Chapter IV describes use EDFA to improve the spectral-slicing WDM-PON system performance, and through theoretical and experimental results show the performance improvement;Chapter V studies of the spectrum split WDM-PON system, crosstalk characteristics of the theoretical models, experimental measurement and spectrum analysis of the impact of crosstalk.Finally, the author pointed out that the lack of existing work on the next stage of work is prospected. |
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