A Novel QoS Aware Wavelength Assignment Algorithm with Dedicated Path Protection Consideration for all Optical Networks

As regeneration capability is not available in all optical networks, the physical layer impairments (PLI) accumulate in the network. During transmission, Quality of Service (QoS) of signals as measured by their Bit Error Rates (BER) is degraded due to propagation in the fibers, amplifier noise, and crosstalk between channels arising from the switches and demultiplexers which cannot be removed at the physical layer. It is possible to mitigate physical layer effects at the network layer using appropriate QoS aware Wavelength Assignment (WA) algorithm. In this paper a WA Scheme based on wavelength pre ordering is presented with dedicated path protection consideration that mitigates PLI. The wavelength preordering technique expected to improve BER performances, due to crosstalk reductions. The proposed WA scheme is performed on a standard regional area network with standard network parameters by defining a realistic physical layer transmission model. The proposed technique is evaluated using simulations and simulations show that the proposed algorithm performs better in terms of blocking rate and BER.