| 摘要 |
PURPOSE:To enable simple branching of an optical signal without using special circuit parts by using a multilayered structure of a multilayered printed circuit board, providing stepwise a slitting groove crossing optical waveguides and packing a light transmittable material having the refractive index different from the refractive index of the optical waveguide into the slitting groove. CONSTITUTION:The signal light P1 made incident at an incident angle theta2 on a plane 18b advances through the optical path of a refractive index theta3 into a core part 13 and is made incident at an incident angle theta4 on the boundary surface 13a of the core part 13. The incident angle theta4 is so set as to be made larger than the critical angle of the part 13 by calculating preliminarily the shapes and size of the core parts 12, 13 and the packing material 19 in a V groove as well as the respective refractive indices. The signal light P1 made incident on the boundary surface 13a of the part 13 is therefore totally reflected by the surface 13a so as to advance in an arrow direction through the inside of the part 13, from which the light is outputted as output signal light P2. If the structure is constituted in the above-mentioned way, the three-dimensionally refractive transmission of the signal light from one waveguide to the other optical waveguide of the different step layer is made possible by the simple construction. |
