| With the improvement of optical fibre communication technology, the capacity of a single wavelength can reach OC-192 (10Gb/s) or OC-768 (40Gb/s). The maturity and widely application of WDM (Wavelength Division Multiplexing) expand the bandwith of optical networks. However, the bandwidth of a connection may be low, and it is not economical to provide a wavelength for every connection. So IP/MPLS over WDM is a good solution, because IP/MPLS layer can provide low speed and sub-wavelength granularity of requests. Traffic grooming can efficiently multiplex a set of low-speed connection requests onto high-capacity channels and intelligently switch them at intermediate nodes. Protection capability is of critical importance for optical networks, because a single failure may affect large volumes of traffic. Protection is classified into link protection, segment protection and path protection. In the two-layer network (e.g., IP/MPLS over WDM), path protection can be applied at two different levels, protection at lightpath (PAL) and protection at connection (PAC).In this dissertation, the author studies different survivability of dynamic traffic grooming in two-layer optical networks, and compares different survivable technology.In chapter 2, the author studies different survivable technology in two-layer optical networks, compares the simulation results, and indicates their using environment.In chapter 3, the author studies different survivable technology based on availability, analyses the effect to availability under different protect techniques.In chapter 4, the author proposes a new algorithm called SPCHTA (Shared lightpath Protection based on Connection Holding Time Awareness), in which the holding time of traffic is known in advance. Simulation results indicate the proposed algorithm performances well.Chapter 5 describes the simulation platform software which is used by the author. Model structure and some Pseudo codes are given too. And at the last, we make a conclusion for this paper. |
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