Constraint based routing due to physical impairments in automatically switched transport networks

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The thesis explores the advancements in next-generation optical communication systems, emphasizing the importance of high data rates, signal powers, and dense wavelength division multiplexing (DWDM). It discusses the evolution of automatically switched transport networks (ASTN) that facilitate transparent optical paths without signal conversion. The work highlights the critical impact of physical impairments, such as dispersion and noise, on signal quality. A swift evaluation of signal quality over transmission distances is essential for optimizing path selection in complex, meshed networks.