student profile: Miss Suen Xin Chew


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Thesis work

Thesis title: Microwave Photonic Phase Shifters on Nanochips

Supervisors: Javid ATAI , Xiaoke YI , Linh NGUYEN

Thesis abstract:

Microwave signal processing is attractive for processing high bandwidth signals. Photonic components providing compact size, large bandwidth, fast tunability, immunity to electromagnetic interference, and low weight, have been widely demonstrated in microwave systems. Microwave phase shifting is an important signal conditioning function that is required in phased-array  beamforming networks for radar and satellite communication systems and in signal processing for defense electronic countermeasure systems. The phase shifter needs to provide 360 degrees phase shifting and to maintain a constant amplitude and group delay in a certain bandwidth in order to minimize the distortion of the signal processing. It is desirable to design an all-optical microwave phase shifter that has a simple structure which can be easily integrated, that has robust operation, and that is capable of realizing a continuous 0 to 360 phase shift with only little changes in output RF signal amplitude over a wide frequency range. On the other hand, silicon Photonics has emerged as the most preferable technology platform for developing several integrated optics based functionalities in the last decades. Silicon-based technology can benefit from economics of scale for mass-market applications, resulting in low-cost and CMOS-compatible solutions. However, a major obstacle for large-scale silicon-based electronic-photonic integration is the indirect band gap of silicon. A very promising solution for implementing active functionalities using SOI platforms consists of bonding on a direct band gap material, especially those belonging to the III-V group. 

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