| 摘要 |
PURPOSE:To realize subminiaturization and stable operation by integrating a polarized wave separating circuit which uses a balanced receiver type polarization diversity reception system by using optical waveguides. CONSTITUTION:This optical circuit is equipped with an optical coupler optical waveguide, 1st and 2nd branch optical waveguides, a polarized wave separating filter 210 inserted into a groove 209, and photodetectors 211a, 211b, 212a, and 212b. Here, the phenomenon that an optical waveguide made of quartz glass holds a linear polarized wave is utilized. Further, two polarization beam splitters are formed of thin film filters in the groove formed at 45 deg. to the optical waveguides and signal light beams of a (p) wave and an (s) wave are detected by balance type photodetectors mounted on waveguide end surfaces. Consequently, the circuit is subminiaturized and the stable operation becomes possible. |
