Physical Layer Structure And Modulation Format Reserch Based On Optical Access Network

With the rapid development of IT industry, cloud computing, virtualization, high-definition video, e-commerce, social networking, high-speed wireless network and so many new type business continue to come up. These bring tremendous opportunities and challenges to base-network. WDM passive optical network (WDM-PON) is a new optical access solutions to meet the rapid growth of bandwidth requirements and compatible with other optical access technologies. Statics show that the growth rate of10G ports is far higher than the growth rate of low speed. The application number of10G high speed ports on access and client devices is larger and larger. However, the growth of transmitting speed beings up the higher cost of transmitting devices. The technique cost and power cost constrain the real usage of10G or higher speed transmitting devices.As a new optical access modulation format, carrier-less amplitude and phase (CAP) modulation is similar to the conventional quadrature amplitude modulation (QAM). Because of the low cost and low power consumption, CAP becomes an alternative signal modulation in high speed network. Machine learning is the hottest research in recent years, which has applications in various fields. Support vector machine (SVM) as a good classification algorithm for signal reception can play special effects in digital signal process, it has great promotion in signal analysis and demodulation.WDM-PON systems physical layer structure and CAP modem access network technology are studied in this thesis using laboratory experiments, Altera Corporation QuartusII platform development environment, VPI, Modelsim and Matlab simulation software. This thesis carries out the following work:Firstly, the current situation and key technologies of WDM-PON is described. A comparative analysis of the10G rate Ethernet physical layer structure, multi-wavelength10G-EPON test system solutions based on RSOA is proposed.Secondly, Design the10Gb/s rate of the physical layer structure solution, a multi-wavelength design10G-EPON physical coding sublayer (PCS) transmission and reception of the frame structure is built at both ends. Using programmable gate array (FPGA) to implement the RTL function simulation and timing verification.Thirdly, design the optical access network using carrier-phase amplitude modulation format for transmission systems, realize modulation and demodulation, also make simulation analysis and experimental tests. The experiments show that the system can meet the CAP10G Access Network transmission requirement.Finally, using machine learning support vector machine (SVM) algorithm to solve phase rotation of CAP system, meanwhile, research high efficient and low complexity M-ary SVM algorithm. Then, extend the research to multi-level multi-band transmission system of CAP, and more complex OFDM-CAP transmission system.