Asymmetric adiabatic polarization beam splitter and integrated optical waveguide filtering chip

An integrated optical waveguide filtering chip, comprising:

• an asymmetric adiabatic polarization beam splitter;
• and
• a packaging structure, used to package the asymmetric adiabatic polarization beam splitter to form the integrated optical waveguide filtering chip, wherein the asymmetric adiabatic polarization beam splitter comprises:
• an optical substrate, having a first side, a second side opposite to the first side, a third side and a fourth side opposite to the third side, wherein the third side and the fourth side are adjacent to the first side and the second side, and from the first side to the second side, sequentially having a first featured region, a second featured region, a third featured region, a fourth featured region and a fifth featured region;
• a first optical waveguide, a second optical waveguide and a third optical waveguide, formed on the optical substrate and extend from the first side to the second side, wherein from the third side to the fourth side, there are sequentially the first optical waveguide, the second optical waveguide and the third optical waveguide;
• a band filtering structure, formed on the optical substrate, located in the second featured region and between the first optical waveguide and the second optical waveguide, used to guide a first specific band light source in the first optical waveguide into the second optical waveguide, wherein the first specific band light source is a light source of a first specific band;
• and
• a polarization filtering structure, formed on the optical substrate, located in the fourth featured region and between the second optical waveguide and the third optical waveguide, used to guide a first polarization direction light source in the second optical waveguide into the third optical waveguide.