| 摘要 |
PURPOSE:To improve the assembly operability by allowing all waveguide ends to face once side edge of a substrate, providing a groove on a branch part and providing a partial transmitting and reflecting filter in the groove, and also, providing an optical reflecting body on a turning-back part. CONSTITUTION:All waveguide ends of an input and an output are allowed to face one substrate side edge 1a. On the surface of a substrate 1, a groove 7 for parting the waveguide is carved and provided, and in this groove 7, an interference filter 8 is fitted and installed. In this constitution, when mixed light beams whose wavelengths are, for instance, 0.85mum and 1.3mum are made incident on an input path 2, the light beam whose wavelength is 0.85mum is led to a reflected light waveguide 3 by the filter 8, and the light beam whose wavelength is 1.3mum is led to a transmission light waveguide 4. The light beam propagated through this waveguide 4 reaches a turning-back part 5 and reflected by a reflecting body 10, propagated as it is in a waveguide 4b, transmits through an interference filter 9, and thereafter, emitted from the waveguide end of the side edge 1a and made incident on an optical fiber 11c. The light beam reflected by the filter 8 is made incident on an optical fiber 11b. In such a way, the assembly operability is improved, and also the assembly work can be executed easily. |
