Dissipative Optical Solitons This book introduces the basic concept of a dissipative soliton before going to explore recent theoretical and experimental results for various classes of dissipative optical solitons high energy dissipative solitons and their applications and mode locked fiber lasers. A soliton is a concept which describes various physical phenomena ranging from solitary waves forming on water to ultrashort optical pulses propagating in an optical fiber. While solitons are usually attributed to integrability in recent years the notion of a soliton has been extended to various systems which are not necessarily integrable. Until now the main emphasis has been given to well known conservative soliton systems but new avenues of inquiry were opened when physicists realized that solitary waves did indeed exist in a wide range of non integrable and non conservative systems leading to the concept of so called dissipative optical solitons. Dissipative optical solitons have many unique properties which differ from those of their conservative counterparts. For example except for very few cases they form zero parameter families and their properties are completely determined by the external parameters of the optical system. They can exist indefinitely in time as long as these parameters stay constant. These features of dissipative solitons are highly desirable for several applications such as in line regeneration of optical data streams and generation of stable trains of laser pulses by mode locked cavities. Chapter1: Dissipative Solitons (DSs): an Introduction Chapter2: DSs in Semiconductor Lasers Chapter3: DSs in Passively Mode Locked Lasers Chapter4: DS Buildup Dynamics Chapter5: Vector Dissipative Solitons Chapter6: Dispersion Managed Dissipative Solitons Chapter7: RamanDissipative Solitons Chapter8: Dissipative Cavity Solitons Chapter9: LaserCavity Soliton Micro Combs Chapter10: Spatial Resonator Solitons Chapter11: Discrete Ginzburg Landau Solitons Chapter12: Multi Soliton Complexes Chapter13: Dissipative Soliton Resonance Pulses Chapter14: Ultra Short High Amplitude DSs Chapter15: Dynamics of Pulsating DSs Chapter16: L band Tunable Dissipative Soliton Fiber Lasers Chapter17: Multiplexed Dissipative Soliton Fiber Lasers Chapter18: Noise Like Pulses in Mode Locked Fiber Lasers Chapter19: Dissipative Rogue Waves.