Abstract: An integrated module for a fiber optic gyroscope system includes a fiber optic sensing coil arranged to sense rotations about a sensing axis via the Sagnac effect comprises a substrate, an optical waveguide formed on the substrate, a light source comprising a doped waveguide formed on the substrate. The light source and the optical waveguide are arranged to produce counterpropagating light waves in the fiber optic sensing coil. The light source may be formed as a rare earth doped polymer waveguide or as a rare earth doped glass waveguide.