Optical waveguide grating and production method therefor

Abstract From the Canadian patent

An optical waveguide grating with radiative mode-coupling properties with exceptional stability and reliability as an optical component wherein the central wavelength of the rejection band has a low temperature dependence due to the use of silica glass doped with germanium and boron for the core. The rejection bandwidth can be narrowed without increasing the grating length by forming the radiative mode-coupled optical waveguide grating in an optical waveguide wherein the mean relative refractive index difference of the core is greater than that of optical communication waveguides. The rejection can be increased by reducing the occurrence of cases wherein propagation modes of the core …