Research On The Key Control Techiniques In The Next Generation Optical Networks

It is proved that services have taken place of techniques as the main driver of the next generation optical networks (NGON) evolution. Kinds of intelligent control techniques are introduced and deployed in the NGON to meet future services' new requirements and characteristics. In the support of China 863 high-tech program projects, China Nature Science Found projects the author has done a lot of work in the key areas of the control of the NGON. The main contribution and innovation of this dissertation are described as follows.1. The relationship between the ASON control link traffic rate (CLTR) and the network traffic load, the relationship between the CLTR and the quantity of the users in the network, and the bandwidth requirements of the control link under different connection setup time limits are developed through simulation. And as the first time, the Multi-granularity ASON (MASON) is evaluated and compared with the Single-granularity ASON. Further more, an ASON control plane protocol stack implementation is developed. A trial network is set up to prove its feasibility.2. A routing control protocol advertising wavelength availability information throughout the wavelength routing optical network is suggested. The results prove that flooding wavelength information throughout the network is feasible.3. Two novel distributed wavelength reservation protocols for wavelength routing WDM optical networks are proposed which are Destination Reservation Protocol and Backward Reservation Protocol with Intermediate Retry. The simulation results reveal that these two new protocols outperform their counterpart protocols. Furthermore, the popular wavelength reservation protocols in the literature are simulated in the same neutral simulation platform and the results are comprehensively compared.4. Two routing update triggers for optical wavelength-routed networks, i.e. available wavelengths Sum change based Trigger and wavelength state Difference based Trigger. The existing triggers do not consider whether the wavelength availability state is changing from free to busy or from busy to free. Our triggers take this into consideration. Results show that the proposed triggers can adjust the routing update more finely through which a better balance between the routing update overhead and the blocking probability can be achieved. The existing evaluation mechanisms can not evaluate the routing update trigger's affection on the routing update overhead. To resolve this problem, this dissertation introduces two new evaluation metrics, i.e. the Average Routing Update Overhead and the Maximum Routing Update Overhead.5. A five-layer architecture is proposed for the ADaptive Optical Network (ADON) which are transport layer, transport control layer, control layer, service layer and management layer. Based on this architecture, a detailed lightpath impairments based ADON routing protocol is developed.