Efficient Distributed Control Routing and Wavelength Assignment Mechanism for a Scalable Hierarchical Single-hop WDM all-Optical Interconnection Network

In this paper we propose an efficient distributed routing and wavelength allocation method for a Single-hop WDM (Wavelength Division Multiplexing) all-Optical Interconnection Network for Scalable Multiprocessor systems. By wavelength allocation, we mean the assignment of unique wavelength(s) to the access nodes. The WDM techniques enable extraction of a larger amount of usable bandwidth. Routing and wavelength assignment algorithms fine-tune the overall process by achieving orders of magnitude of performance improvement. The goal in this paper is to present an efficient dynamic distributed routing and wavelength allocation method that minimizes path latency, wavelength blocking and the number of wavelengths applied. We have applied this routing and wavelength allocation method in the simulation study of a multiprocessor interconnection network. The results are also presented. The overall effect is that our results show an improvement in performance, scalability and flexibility. This routing control mechanism and wavelength assignment is well suited to the SCOPIN (SCalable OPtical Interconnection Network) architecture introduced in [1]. The SCOPIN architecture is quite scalable, hierarchical, regular and can easily be implemented using optics. With a distributed control, the interconnection networks are more robust and fault tolerant.