Nanotechnology has been recognised as the interesting subject of research and investigation in either theory or experiment for a decade, where many research works and implementations have shown the significant growth and progress in many related technologies. Recently, the use of a small wave guide known as micro and/nanoring resonators has shown the potential of applications in many research areas, especially, in computer, communication and signal processing in the nanoscale regime. This book presents the immerging techniques that can be merged into one particular subject, which is known as Nano Communications Networks. In applications, such devices, techniques or systems can be integrated and used for some particular applications.

Optical devices have become interesting tools that can be used in various applications. The use of such devices have been investigated in many areas such as E/O (electrical/optical) and O/E(optical/electrical) signal converters; optical signal processing; optical sensor; optical communication and medicine, etc. More interesting applications have been introduced such as the use of a micro/nanoscale device, which has become both interesting and challenging. In this book, the behaviour of light(light pulse) within the micro and nanoscale device(ring resonator) is investigated. This can be integrated to form circuit and system devices that can be used for atom/molecule trapping and transportation; optical transistor; fast calculation device(optical gate); nanoscale communication and networks and a device for medical applications.