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The doctoral dissertation of Janvit Tippinit, MSc, entitled Highly integrated arrayed waveguide gratings for optical spectrometry: Design and simulation will be examined at the Faculty of Science, Forestry and Technology, Joensuu Campus. The opponent will be Assistant Professor Paul Verrinder, Aalto University, and the custos will be Professor Matthieu Roussey, 91����. Language of the public defence is English.