OPTICAL WAVEGUIDE TYPE ELEMENT AND PHASE ADJUSTMENT METHOD OF OPTICAL WAVEGUIDE TYPE ELEMENT

摘要

PROBLEM TO BE SOLVED: To enable easy manufacture by using an optical waveguide type element without having a phase adjustment function and to enable the easy phase adjustment over a wider range with low energy by forming a notched groove so as to cross the core part for guiding light on a substrate and packing org. polysilane into this notched groove. SOLUTION: The optical waveguide type element having the core 3, lower clad 2 and upper clad 4 which are formed on the substrate 1 and have no phase adjustment function is used and the notched groove 5 is formed in the laminated layers consisting of the clad layers 2, 4 and core 3 on the substrate 1 so as to cross the core 3 for guiding the light on the substrate 1. The org. polysilane is packed into this notched groove 5. The org. polysilane is poly and is polymerized by reflux of the corresponding 2-substd. dichlorosilane in toluene in the presence of sodium. A refractive index decreases with the photodecomposition of the org. polysilane by irradiation with UV light. This value is >=5 times as compared with a dyestuff dispersion type high polymer which induces a large refractive index change.