Research On GMPLS-based Optical Label Switching Technology

With the arrival of the multi-media information era, a greater variety of service information, such as voice, data and image information, needs to be transmitted, switched and processed. And higher transfer rate, switch rate and storage capacity also needs to be satisfied. In this aspect, optical switching technology shows its advantage that the electrical switching can not be compared, and it becomes one of the important supporting technologies in the next generation all-optical network. In current transport network, WDM technology can satisfy people’s needs for bandwidth, but the simple use of WDM can not fundamentally overcome the electronic speed "bottleneck" in network nodes. From the entire network structure, high-speed transfer rates and low-speed switching rates can not match, so the method to overcome "bottleneck" is to transfer data directly in DWDM rather than ATM and SDH layer, namely establishing all-optical Ethernet (IP over DWDM). In this situation, as the basis for building all-optical Ethernet, optical label switching (OLS) technology has become a hotspot in optical switching field both at home and abroad.Generalized Multiprotocol Label Switching GMPLS is extended and updated from MPLS in order to implement the dynamic control in intelligent optical network and to meet the requirement of transport signaling. The generation of GMPLS made the management of IP and transport network no longer independent of each other, and then enable IP layer to integrate with optical layer seamlessly, so it is very important to research GMPLS-based OLS system.The paper mainly focuses on the GMPLS-based optical label switching technique, and does the research in the following two aspects:(1) Analyzing several modulation formats in high-speed optical communication system, and comparing their transmission performance of anti-dispersion and anti-nonlinear in40Gbit/s system. Then, according to the conclusions, we propose two schemes of optical packet generation in OLS system:Manchester-SCM/CSRZ-DPSK hybrid modulation scheme and Manchester-SCM/CSRZ-DPSK dedicated scheme. Also, we verify their feasibility and analyze their own performance.(2) After proposing the generation scheme of optical packet in the first part, this part mainly researches on control of packets forwarding and switching, that is, Traffic Engineering TE. We analyze GMPLS TE mechanism, including extensions of routing and signaling protocol, and verify the application of GMPLS TE in the network through simulating and analyzing the performance indicator of network throughput and link utilization.