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  % relevant application    This design proposal main purpose is to study an optical device known as the Mach-Zehnder interferometer interferometer(MZI)  via simulation and to verify its operation experimentally. The device will be fabricated using Silicon over Insulator (SOI) technology. These types of interferometers are commonly employed in telecommunications applications such as switches, modulators and filters. Also, in sensing applications, MZI are commonly employed to allow on of the arms of the interferometer to interact with an analyte via the evanescent field of the waveguide.  In this draft design, two devices were chosen. The first is a simple MZI with different path length difference $\DeltaL$. An explanation of a MZI operation is presented.   The second device is a basic filter based on two cascaded interferometers. Also, the basic theory of a lossless two stage MZI filter is presented.  In this report simulations in terms of optical component and circuit device are explained, which will be compared with future experimental results after device fabrication.