WAVELENGTH SEPARATING FILM AND FILTER FOR OPTICAL COMMUNICATION USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a wavelength separating film in which the total number of laminating films can be reduced, while thickness of each laminated layer can be reduced, and shift breadth of a transmission band and a blocking band due to deviation of an incident angle of light can be reduced and further the blocking band can be made broader than before, and to obtain a filter for optical communication using the same. SOLUTION: The wavelength separating film is constituted by alternatively laminating a first thin film consisting of a high refractive index material and a second thin film consisting of a low refractive index material. The first thin film is a Si thin film and the second thin film is a Ta2O5thin film or a Nb2O5thin film or a ZrO2thin film or an Al2O3thin film. COPYRIGHT: (C)2008,JPO&INPIT