| 摘要 |
PURPOSE:To provide the optical multiplexer/demultiplexer which facilitates optical axis alignment and has small light loss. CONSTITUTION:A slab type intermediate waveguide 10, channel type demultiplexing waveguides 12, multiplexing waveguides 13, and two-way waveguides 14 are provided on a substrate 16 in monolithic structure and the alignment of the optical axes is facilitated. The demultiplexing waveguides 12 and multiplexing waveguides 13 are provided on one side of the intermediate waveguide 10 and the two-way waveguides 14 are provided on the other side. A total reflecting surfaces 18 are provided on the opposite sides of the two-way waveguide 14 from the intermediate waveguides 10. When the difference (d) in length between adjacent two-way waveguides 14 is set to an optional suitable constant value, wavelength-multiplexed light can be converged on constant positions differing with the wavelength at the time of the incidence of the light on the intermediate waveguide 10 from the multiplexing waveguides 13 through the intermediate waveguide 10, two-way waveguides 14, and reflecting surfaces 18. The demultiplexing waveguides 12 are arranged at the convergence position of the light. The two-way waveguides 14 are arranged radially about the multiplexing waveguides 13f to narrow down the convergence area of the light by the wavelengths, thereby reducing the light loss. |
