'Advances in Optics: Reviews' Book Series is a comprehensive study of the field of optics, which provides readers with the most up-to-date coverage of optics, photonics and lasers with a good balance of practical and theoretical aspects. Directed towards both physicists and engineers this Book Series is also suitable for audiences focusing on applications of optics. A clear comprehensive presentation makes these books work well as both a teaching resources and a reference books. The book is intended for researchers and scientists in physics and optics, in academia and industry, as well as postgraduate students. The fifth volume is devoted to optics, lasers, optical communication and networks, and written by 53 authors from academia and industry from 12 countries: Belgium, Bulgaria, China, France, Italy, Iraq, Japan, Russia, Spain, Turkey, USA and Vietnam. But it is not a simple set of reviews. As usually, each chapter contains the extended state-of-the-art followed by new, unpublished before, obtained by the authors results. This book ensures that our readers will stay at the cutting edge of the field and get the right and effective start point and road map for the further researches and developments. By this way, they will be able to save more time for productive research activity and eliminate routine work.