| 摘要 |
PURPOSE: To make it possible to obtain low propagation loss and high environmental safety by constituting the optical waveguide of a layer of a polymer material contg. epoxy groups having different degrees of polymn. and eventually a preselected range of different refractive indices. CONSTITUTION: This polymer-like optical waveguide consists of the layer of the polymer-like material contg. the epoxy groups having the different degrees of polymn. and eventually the preselected range of the different refractive indices. In such a case, the optical waveguide is constituted by coating a suitable base body 10 with a layer 20 of a coating material, for example, quartz, glass, polymer, etc. This coating layer has the refractive index lower than the refractive index of the core or polymer optical waveguide material and is optical. The layer described above is then coated with a layer 30 of a photosensitive polymer, more typically an Epirezsu 8 having a photoacid. The coatings applied on the base body are then subjected to baking for several minutes. The negative photomask formed in such a manner forms the desired patterns of exposed regions 40 and unexposed regions 50. |
