A differentiated survivable service provisioning (DSSP) framework is investigated in this paper for optical networks
providing dedicated path protection (DPP) and shared path protection (SPP) services. To tackle the service provisioning
problem under the framework, spare capacity allocation (SCA) problem is studied first. The structure of the problem is
captured by a set of matrices. Then, based on the matrix model, a path-flow integer linear programming (ILP)
formulation is presented to find the optimal service provisioning solution for a given set of traffic demands. The
objective is to minimize total capacities consumed by working and backup paths of all demands. Furthermore, network
performance under the dynamic DSSP framework is illustrated in terms of blocking probability, resource overbuild and
average hop distance.
Considering the economic and technical aspects of wavelength converters, full wavelength conversion capability will not be available throughout optical networks in the foreseeable future. This letter investigates the wavelength assignment problem in wavelength-continuous optical burst switching (OBS) networks. First, we develop a novel static approach, termed balanced static wavelength assignment (BSWA), which outperforms all other static strategies, and achieves almost the same performance as dynamic strategies with the advantage that no extra dynamic information is needed. Then, we apply BSWA to a dynamic approach to accelerate network convergence and reduce the initial burst loss. Numerical results show that our approaches make significant improvements in the burst loss probability in OBS networks.
Optical Burst Switching (OBS) is supposed to be a promising switching technology in the future WDM networks,
which is suitable to support burst traffic. A problem with OBS network is that bursts with longer routing lengths are
more likely to be dropped before arriving at the destination router. In this paper, we propose two approaches using offset
time differentiation (OTD) and burst length differentiation (BLD) to solve the burst loss differentiation (BLP) unfairness
problem in OBS networks. Simulations show that BLP fairness in OBS is greatly enhanced with our approaches,
especially with the OTD approach. Besides, we also investigate the BLP unfairness problem in offset time based QoS