This book is titled with optical fiber and solitons consist of five units The first units deals with that apart from optical fiber an optical transmission system would need in a practical system two other key elements namely the transmitter and receiver which had been already developed independentlyIn order to send a light signal through optical fiber it is required to have a source that emits a bright directional signal Also since light signals are often in digital form that is the information is conveyed in the form of series of light pulses the light sources should e capable of being turned on band off quickly