Waveguide type polarization mode converter

The invention discloses a waveguide type polarized mode converter, which is composed of a conventional dielectric waveguide which contains a substrate layer, a covering layer and a core layer; wherein, the core layer is formed by that the head and the tail of an L-shaped conversion waveguide are respectively connected with a rectangular input waveguide and a rectangular output waveguide which has a different dimension with the input waveguide, and also can be formed by that the head and the tail of the L-shaped conversion waveguide are respectively connected with a rectangular input waveguide and a rectangular output waveguide which has the same dimension as the input waveguide through a conical transition waveguide. The converter can realize the polarized mode conversion between the rectangular waveguides with different dimensions or same dimensions. The input waveguides which are processes by the polarized conversion have wide dimensional variation range, and the single mode conditions are easy to satisfy. The converter has simple structure, the required fabrication technology is mature, the dimension is compact, the polarized conversion efficiency is high, the frequency range is wide and is easy to be integrated, and the converter can be widely applied to the optical integrated circuits which are operated in the single polarized mode.