Research On Key Techniques Of Metropolitan Optical Networks

Metro optical transport network is a general transport platform. It can support data, voice and video traffic over the same infrastructure. This requires the metro optical transport network to provide various data interface, maximize utilization of available bandwidth. The new technologies, such as virtual concatenation, link capacity adjustment scheme (LCAS) and Generic framing protocol, inject a strong vigor to its application in next generation networks. These technologies make it possible for SDH/SONET to create a right-sized pipe (bandwidth) for data services.Sponsored by the 863 Program of China our research work in this dissertation is listed as follow:The architecture of the smart metropolitan area network is studied in this dissertation. The key techniques, such as virtual concatenation, LCAS, and GFP are analyzed in detail. The transmission delay of virtual concatenation and the delay due to the LCAS protocol are analyzed carefully. In current SDH/SONET networks, only multiplex section protection or path protection can't satisfy the need of survivability. The combination protection is suggested based on the advantages of above two protection methods. By simulation and analysis, the combination protection is superior to the multiplex section protection and path protection in the ratio and the time of protection.The path selection for member of virtual concatenation group is NP complete problem in SDH networks applied virtual concatenation technology. A-TSOP algorithm is proposed that the new adding VC-n satisfies the differential delay constraints while maintain high utilization of network resources. Simulations are conducted to show the performance of A-TSOP is superior to K-Shortest Path algorithm and Modified-Link-Weight K-Shortest Path algorithm.The characteristics of the multi-granularity node with the tunable wavelength converters have been analyzed. A new dynamic routing and wavelength assignment algorithm applied in multi-granularity optical switching network is proposed. The performance of our MG-OXC with tunable optical converters is evaluated with numerical experiments under NSFNET topology, compared with traditional OXC or MG-OXC. The results show the performance of our MG-OXC with tunable wavelength converters is superior to the network composed with traditional OXC and MG-OXC.The key technologies in the UNI, for example the services offered over the UNI, Signaling transport and service invocation reference configuration, addressing, etc, have been researched in chapter 3. In the end a finite state machine for each node is raised based on GMPLS RSVP-TE to implement UNI signaling.The multi-granuliarity testbed is complished by my research group. This tesbet has four nodes, and will combine with ASON and MSTP system. Several experiments related to MG-Lightpath establishment and restorations are demonstrated with these platforms.