Khun-in, R.; Usman, A.; Bhatranand, A.; Jiraraksopakun, Y.; Choowitsakunlert, S.; Theeradejvanichkul, T.; Yokoi, H. Design and Fabrication of 1x2 Multimode Interference Coupler Using Photosensitive Permanent Material for Wavelength Division Demultiplexing. IEET 2025, 11, 12-20.