Research And Circuitry Design Of GPON User Termination

The passive optical network (PON) breaks traditional point-to-point solution and only uses passive nodes, so it costs lower in operating and is easy to upgrade. Compared with APON and EPON, Gigabit-capable Passive Optical Network (GPON) is an emerging broadband access networking technology, which has advantages of high-efficiency, high-speed, high-bandwidth utilization and suppoits whole service. As a result, GPON has bright prospects .The Optical Network Unit (ONU) is an important part of GPON system, it affects user's financial capacity directly. While domestic researches on the ONU drop behind: there is no mature technique, and the equipment costs higher. Therefore, the resarch on GPON termination is very urgent.The main content of the paper is as follows:1. This paper introduces the development of passive optical network, present researches, and virtues of GPON;2. On the basis of G.984, this paper illuminates GPON architecture, operation principle and some key techniques of GTC;3. By analyzing GPON PMD (physical medium layer) and GPON ONU, the paper proposes system architecture of GPON user termination, combined with the technology of ARM and FPGA;4. Analyzing physical layer transceiver module, embedded management control module and FPGA processing module functions,then designing the specific hardware circuit, including the chip selection and peripheral interface circuit design;5. Building the optical transceiver hardware platform and the embedded hardware platform on the basis of the design schemes, and realizing a normal serial communication on embedded hardware platform; This paper highlights the system architecture of GPON user termination and the specific circuit design. In order to achieve better performance, at the stage of debugging, it is necessary to verify the rationality of hardware design, and optimize the system according to the testing results. This research plays a positive role in popularizing GPON in China.