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Master’s Thesis Defense Wednesday, April 13, 2016 12:30 PM in FH 580 LOW NOISE ALL OPTICAL SWITCH AND GeSn LASER FOR SILICON PHOTONICS Yun Zhao University of Dayton Abstract Silicon based electronics revolutionized the second half of the 20th centenary. Moore’s law has been successfully predicting the growth of integrated circuits for more than 40 years, but the trend has slowed down. To keep meeting with the ever so strong demands, new breakthrough is keenly needed. With the inspiring success of optical communication technology, many researchers believe this breakthrough relies on bringing optics onto silicon chips. This leads to the study of silicon photonics. All optical switch is one of the versatile components in silicon photonics. In optical interconnections, where on chip metal wires are replaced by waveguides, it can route the signals to the right destinations. Compared with traditional optical switches, all optical switch requires less power and generates less heat, which qualities are highly valued for large data center and high performance computing applications. In the future optical computing systems, it can serve as the logic gates. It is also likely to find its place in the more advanced quantum communication networks. On silicon chip laser is another fundamental component for silicon photonics. A scalable solution, where time consumption does not grow with the silicon wafer size is not yet found. In this thesis, we demonstrate two promising devices that is useful for silicon