Design And Implementation Of Passive Optical Network Applied In Industrial Communication Field

The Industrial Ethernet, which has the advantage of unified standards and strong interoperability, makes its rapid development in industrial communication field. The CSMA/CD mechanism worked well in the traditional industrial Ethernet before. But now both its rate and bandwidth are unable to meet its needs. The Passive Optical Network(PON), which has a superior data throughput, high-speed, can adapted to the harsh environment, low costs and many other advantages, has been widely used in the communication network. However, the commercial PON technology was designed for telecommunication network. It will can’t fully meet the increasing demand of the industrial field communication in aspect of the real-time and cost-effect. So, the application of PON is not much in the industrial communication field. This paper design a kind of PON, which considered the industrial communication of real-time, anti-interference, low cost requirements, can be used in the industrial field instead of industrial Ethernet. Aiming at the application of the advanced PON technology in industrial communication field. The main work and achievements are as follows:1) On the basis of in-depth analysis of the EPON hierarchical model. Design the OLT and ONU respectively according to the design idea of modularization, and discusses their hardware implementation scheme. Located in the central node of the optical line terminal(OLT) and at the access node of the optical network unit(ONU) is a key equipment in PON system. The hardware design scheme of OLT designed for FPGA+MPU structure. In the ONU design, FPGA as the main control module. The OLT is divided into four parts of MPCP Layer, OAM Layer, Physical Media Layer and Business Interface Layer. ONU consists of three parts:Data Link Layer, Physical Media Layer and Business Interface Layer. 2) Describes the functionality of each module, select the appropriate chip through market research. Using DXP2004EDA design software to complete the schematic design of each module. Make the system clock and high speed data bus signal into PCB board according to the rule of high-speed digital circuit, Installing and welding for myself. Completed the physical circuit, and debugging the main circuit.3) Analysis of the strengths and weaknesses of several classical dynamic bandwidth allocation (DBA) algorithm. According to the requirements of real-time and fairness in the industrial communication system, We propose an improved algorithm. This DBA algorithm is to put forward a three-point improvement on the basis of the algorithm based QoS guarantee:based on the minimum time slot set, depending on the business class distinction scheduling, and bandwidth report request improvements. Ensure the fairness of bandwidth allocation and the real-time of the system.Testing the service interface of the system and the bit error rate of the system, and joint the OLT and ONU together for debugging. Finally, The paper make a summary of the full paper, and put forward some prospects of further research.