Materials with nonlinear properties are a basic ingredient of any device that can efficiently switch and amplify optical signals. The need for such materials has increased with the growing use of optical frequency waves as carriers of information over long distances. A particularly desirable type of nonlinear property is bistable behavior, i.e. having two possible steady states under the same external conditions and the option of switching between them. Many proposals for achieving this type of behavior have been made, but they often involve a special material where bistability is found only in a narrow, well defined frequency range and above a certain intensity threshold, both of which cannot be altered. One way of possibly avoiding such limitations is to achieve bistable behavior in composite materials. It is important to realize that optical communications is not like electronic communications. While it seems that light travels in a fibre much like electricity does in a wire this is very misleading. Light is an electromagnetic wave and optical fibre is a wave guide. Everything to do with transport of the signal even to simple things like coupling (joining) two fibres into one is very different from what happens in the electronic world. The two fields (electronics and optics) while closely related employ different principles in different ways. Some people look ahead to “true” optical networks. The present research paper focus on Non Linear Properties in Materials of Optical wave guide: Nonlinear Optical Effects in Silicon of Optical Wave guide

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