The Design Of The Core Node In The Optical Packet Switching System

Stepping into the information age of the new century, a variety of the new network services and applications based on IP technology increases very fast with the the rapid development of Internet applications,which leads to the exponential growth of the data that flows through the backbone network,and it put forward higher requirements for the performance of communication networks. Optical packet switching is a packet level optical switching technology that can quickly assign optical channel in the size of packet, and it supports ATM and IP access technologies, therefore Optical packet switching has a great prospect.This article first introduces the basic functions and network reference model of the all-optical packet switching, and describes the system architecture of the core node and its main modules. Then mainly discusses three main optical packet coding techniques that are most researched, including the optical packet serial encoder, optical packet parallel encoding and optical packet band signaling coding. We focuse on a novel carrier suppression optical packet coding method is analyzed, and according to that, an optoelectronic hybrid core node architecture based on carrier suppression modulation the principle is designed, which includes the data transport layer in the optical do main and the control layer in the electric field. In the use of OptiSystem, the transmission and transformation of the optical packet in the core node is simulated, and an experimental platform is built which realizes the 10Gb/s payload and 1.25Gb/s label in the core node optical domain data transmission system, and we respectively study the transmission performance of the label and the payload. Then we introduce the hardware design of electric field control layer, and describe its main modules, finally we set up a system to test the electrical domain control layer functions.It can be obtained from the simulation and experimental results in the optical domain: Under the condition of the1.25Gb/s label modulation rate and the 10Gb/s payload modulation rate, the signal quality of the optical packet based on the carrier suppression modulation is very good, the BER is still able to maintained less than 10-10 after the 60 km transmission distance; In the standard of BER=10-10, the power penalty of the label and payload is 1dBm and 2d Bm respectively after 40 km transmission distance. The results of control layer test in the electric field showed that: It is feasible that realizes the optical switch electrically in the use of SFP module, FPGA control board and optical switching driver board, the payload can be switched successfully in the optical domain based on the routing information in the optical label.