| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical multiplexer/demultiplexer which has the function of D-WDM and the function of WDM by using one optical component by forming a reflection grating at a specific position of a channel waveguide array for connection. SOLUTION: Light of the 1.55μm band which is made incident on an input waveguide 41 spreads laterally because of diffraction effect when entering an input-side slab waveguide 43a, and then enters the respective waveguides of the waveguide array 45. Refraction gratings 46 of the 1.55μm band are formed almost in the center of the waveguide array 45 and the position of each reflection grating 46 is shifted by certain length from an input-side slave waveguide 43a. Consequently, the lights which are made incident on the respective waveguides are different in reflection position and the tilts of equal-phase surfaces are different by wavelengths of the 1.55μm band right before the input- side slab waveguide 43a. Namely, the light of the 1.55μm band is projected from an output waveguide 42 and branched, and light of the 1.3μm is projected from an output waveguide 44 without being affected by the reflection gratings 45 of the 1.55μm band. |
