| 摘要 |
PURPOSE:To simplify the assembly, and to improve the productivity by placing an input terminal and an output terminal vertically against an interference filter means. CONSTITUTION:As for the light having plural wavelengths lambdaa-lambdad, which has been made incident on an optical fiber 16, the wavelengths lambdaa, lambdab pass through a long wavelength pass filter 24, and the wavelengths lambdac, lambdad are reflected. As for the wavelengths lambdaa, lambdab which have passed through the filter 24, only the wavelength lambdab is reflected by a band-pass filter 26A, and the wavelength lambdaa and the wavelength lambdab are obtained from an optical fiber 20a and an optical fiber 20b, respectively. On the other hand, as for the wavelengths lambdac, lambdad which have been reflected by the filter 24, only the wavelength lambdad is reflected by a band-pass filter 26C, and the wavelength lambdac and the wavelength lambdad are obtained from an optical fiber 20c and an optical fiber 20d, respectively. In this regard, input/output terminals 16, 20A-20D are displaced and provided so that the light passes through the center of a lens at a point opposed to an interference filter means 14, therefore, lenses 18, 22A-22D can be placed vertically against the filter means 14. |
