Embedded Fault-Tolerance Routing and Wavelength Assignment Algorithms in DWDM Networks

Abstract

DWDM (Dense Wavelength Division Multiplexing) is a technique of sending many light beams of different wavelengths simultaneously down the core of an optical fiber. Although, the wavelength conversion can efficiently improve the problem of wavelength conflict and also can increase the wavelength reusable rate. The number of wavelength conversion should be minimized since the response time of the wavelength converter will affect the QoS of the networks. This paper proposes the embedded fault-tolerance routing and wavelength assignment algorithm to wavelength convertible connection accommodation in the wavelength-routed networks. There are four phases in the proposed algorithm, which are validation, transformation, allocation (wavelength assignment), and fault tolerant phases, respectively. These mechanisms are studied to reduce the number of wavelength converters from the system but also keep its own efficiency.