| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical multiplexer/demultiplexer capable of reducing cost and miniaturizing and obtaining stable optical characteristics by suppressing an effective area of the grating surface to the absolute minimum with respect to the spread of the incident light in the blaze direction on the grating surface when a diffraction grating having a large angle of incidence like an echelle grating is used. SOLUTION: This device is an optical multiplexer/demultiplexer which diffracts an optical signal outputted from the other end of a light waveguide path array element 3 having an input/output ports array 2 at one end by guiding it to a planer diffraction grating 5 through a lens 4 and inputs the optical signal diffracted through the diffraction grating 5 into the other end of an optical waveguide path 3 through the lens 4. The two opposite sides of the diffraction grating 5 are fixed with rod-shaped supporting members 6, 7 on the substrate 1, so that the light waveguide array element 3 and the lens 4 are fixed on the substrate 1 before the diffraction grating 5 can be fixed on. |
