Fiber-optic network, on both small and large, have many advantages over traditional wire and wireless networks. Second, optical networks provide huge bandwidth that hundreds of times greater than other media. In Optical Networks, Ramaswami and Sivarajan author explores the concepts of scientific and engineering considerations behind the network-based light. The authors begin with the physical phenomena that make possible optical network. The authors then cover various means of encoding information into light waves, considering topics such as wavelength routing, network topology, and management. Readers who plan to make an optical network may find that this book of case studies is the most interesting part of the text. The authors give examples of real networks that have built different companies, including AT & T's Africa ONE and Alcatel's WDM Ring.