With the development of new laser sources, fiber amplifiers, and other optical components, optical communication systems have undergone enormous growth and evolution in recent decades. The current trend of optical networking is to move towards dynamic, all-optical networks. In all-optical networks, information signals are transmitted from source to destination totally in the optical domain, without the usual optical-electrical-optical conversions at intermediate nodes. New challenges and opportunities emerge in different layers of the optical network architecture in this transition process. This book explores several interesting topics in both the physical layer and the network layer of all-optical networks. Our studies examine physical impairments which can adversely influence network performance. Both novel proactive and reactive approaches are proposed to improve network performance and provide quality of service (QoS) for users. The proposed methods and algorithms can be especially useful to professionals, students, and researchers working in the field of optical communications.

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