Optical Burst Switched Networks provides an overview of optical burst switching which is intensively used in the area of network quality of service. Design and research issues involved in the development of OBS networks are discussed, and approaches to providing QoS in OBS networks are presented. Topics include: optical burst switching node and network architectures; burst assembly; signaling protocols; contention resolution; burst scheduling; quality of service in OBS networks. The audience is industry practitioners, researchers, and graduate students who work on (and/or want to learn more about) optical WDM networks, and/or related fields.