MSc Somnath Paul presents in his doctoral thesis the design, manufacturing and experimental verifications of silicon photonic components for telecommunication applications. Paul used diffractive optics methods to design the nanometre-scale devices. The main focus of the research was to demonstrate an on-chip add-drop filter, based on waveguide Bragg gratings, that are one of the essential building blocks for optical integrated circuits. The optical integrated circuits are omnipresent in many consumer electronic products, especially in the fields of telecommunication and sensing technologies.
Paul further presented a phase modulation technique to demonstrate multi-wavelength operations of those on-chip add-drop filters. The modulated phase functions for the multi-wavelength operations are calculated with the iterative Fourier transform algorithm. He has experimentally shown sub 1 nm bandwidth of the filters with the commercially suitable manufacturing technologies. The demonstrated devices show robust functions and have good potential to be used in the commercial optical integrated circuits.
The doctoral dissertation of MSc Somnath Paul, entitled Prospects of on-chip integrated silicon photonic Bragg gratings will be examined at the Faculty of Science and Forestry. The opponent in the public examination will be Research Team Leader Timo Aalto, VTT Technical Research Centre of Finland, and the custos will be Associate Professor Matthieu Roussey, University of Eastern Finland.
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