| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength branching filter circuit which is suitable for high integration by reducing the size, making the operation fast, and improving element characteristics such as transmission efficiency and performance. SOLUTION: This wavelength branching filter circuit controls wavelength deflection by generating strong wavelength dispersion characteristics that ordinary optical crystal does not have by not forming waveguides individually like a conventional AWG(array waveguide), but periodically arraying materials which are different in refractive index and is characterized by that a substrate 1 structured by embedding atom media 5 in a background medium 4 in two-dimensional triangular arrangement is sandwiched between a 1st clad 2 and a 2nd clad 3, an incidence surface 6 for a light signal slants at a certain angle to the incidence direction, and the light signal is outputted from a projection surface 7. The adjacency intervals of the atom media 5 are designed in conformity with the wavelength of the light signal and the thickness of the substrate 1 is so designed that the light signal is confined sufficiently to the substrate 1 and the travel direction of the light may not deviate greatly from the substrate surface. |
