Abstract
This paper considers the physical layer transmission impairments while establishing a call in a wavelength-routed optical network. The impact of different routing and wavelength assignment (RWA) algorithms on the crosstalk performance of a 4x4 mesh-torus and a 15-node mesh network has been studied. This paper considers both switch-induced crosstalk and the crosstalk induced by the multiplexers and demultiplexers. A fast and accurate approach is employed to study the impact of gain saturation of Erbium-doped fibre amplifiers (EDFA’s) on the received signal quality of a 15-node network of interconnected rings. Previous works have approximated the measured EDFA gain curve by curve fitting approach. In this work, EDFA gain is numerically determined using the fast and accurate approach. The crosstalk and EDFA gain saturation can lead to poor received signal quality at the destination node. This results in increased receiver bit error rate (BER). This implied that some of the routes will deliver a signal quality which is unsatisfactory. To ensure that no resources are wasted on those connections which cannot deliver an acceptable signal quality, this paper uses an event-driven simulation which incorporates on-line BER calculations. A call is accepted only if the BER at the destination node is less than 10−12; otherwise it is rejected.
Published Version
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