Patent ID: 6546161
Filing Date: 2003-04-08
Classification: G02B

Abstract:
A no polarization dependent waveguide type optical circuit including at least two input waveguides formed on a substrate, a first directional coupler connected to said input waveguides, at least two output waveguides, a second directional coupler connected to said output waveguides, two connecting waveguides connecting said first directional coupler and said second directional coupler forming an optical circuit, and a polarization mode converter provided at a center of an optical path of said connecting waveguides of said optical circuit and converting a horizontally polarized light into a vertically polarized light and converting a vertically polarized light into a horizontally polarized light, whereinintermediate portion of said connecting waveguides being formed with S-shaped waveguides of the same shape consisted of respectively two curved waveguides or two curved waveguides and straight waveguides connecting said curved waveguides, and a polarization mode converter being provided in a groove formed across said S-shaped waveguides, and a perpendicular line to an incident surface of light of said polarization mode converter and said S-shaped waveguide forms an angle,greater than 0Â°.