3D waveguide is attractive because it has a potential that the waveguides are arranged, not only in plane, into three-dimension. Mosquito method, of which the core and cladding material sources are liquid and will be cured using UV-light, is known as one of the ways to fabricate the 3D waveguide. In this method, if multiple waveguides are fabricated, time until UV-cure is different between first waveguide and last one and it leads to core position shift because of gravity. To solve the problem, we considered to reduce the time from the first waveguide formation to the UV-cure using automatic waveguide fabrication with a camera. For the automatic waveguide fabrication, YOLO (you look only once) and OpenCV is exploited as machine-learning and image-processor, respectively. As a result, waveguide recognition time of 10 ms and image processing time of 50 ms, totally 60 ms, are realized.
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