Quantum Dot Lasers can be considered as a quantum leap in the development of lasers. Quantum Dots improve basically the laser emissions. This property of Quantum Dots is well utilized for fiber optic communication, which is now the leading subject under research and development. Quantum Dots are thus very well used in applications fiber optic communication. The remaining major division of the field of quantum electronics deals with the interactions of coherent light with matter and again leads to a wide range of all-optical and optoelectronic devices. Basically Quantum Dots are made of InGaAs or simply GaAs structures. Also the possibility for extended wave length (?>1.1µm) emission from GaAs based devices is an important characteristic of Quantum Dots. The QDs are formed by an optimized growth approach of alternating sub-monolayer deposition of column III and column V, constituents for optoelectronic device fabrication. Thus there is a large energy separation between states.