Integrated biplane optical sensing core chip

An integrated biplane optical sensing core chip, at least comprising:

• a non-linear optical substrate, a first waveguide structure, a second waveguide structure and a waveguide coupled fiber;
• wherein
• the first waveguide structure has a first main waveguide and a first branch waveguide on the non-linear optical substrate, wherein the first branch waveguide is formed by a first branch optical waveguide and a second branch optical waveguide, both of which are branched out from the first main waveguide, the first branch optical waveguide and the second branch optical waveguide have a first branch angle therebetween, and the first branch angle has a first opening direction which is a direction of an opening of the first branch angle;
• the second waveguide structure has a second main waveguide and a second branch waveguide on the non-linear optical substrate, wherein the second branch waveguide is formed by a third branch optical waveguide and a fourth branch optical waveguide, both of which are branched out from the second main waveguide, the third branch optical waveguide and the fourth branch optical waveguide have a second branch angle therebetween, the second branch angle has a second opening direction which is a direction of an opening of the second branch angle, and the second opening direction is parallel to and extends opposite to the first opening direction;
• the first main waveguide of the first waveguide structure is connected to the second main waveguide of the second waveguide structure via the waveguide coupled fiber;
• the integrated biplane optical sensing core chip comprises a first region, a second region and a third region, which are sequentially connected in series and extend horizontally;
• the first branch optical waveguide, the second branch optical waveguide and the second main waveguide are sequentially disposed along a vertical direction within the first region;
• the first main waveguide, the third branch optical waveguide and the fourth branch optical waveguide are sequentially disposed along the vertical direction within the third region;
• and the first branch optical waveguide, the second branch optical waveguide, the third branch optical waveguide and the fourth branch optical waveguide are sequentially disposed along the vertical direction within the second region;
• and
• the first branch optical waveguide and the second branch optical waveguide form a first branch portion, the first branch optical waveguide and/or the second branch optical waveguide extend non-horizontally from the first branch portion;
• the third branch optical waveguide and the fourth branch optical waveguide form a second branch portion, the third branch optical waveguide and/or the fourth branch optical waveguide extend non-horizontally from the second branch portion;
• the non-linear optical substrate has first side, a second side, a third side and a fourth side, which are sequentially connected in series and in a circular arrangement, and the fourth side is connected to the first side;
• and the first region comprises the first side and a part of the second branch portion, the third region comprises the third side and a part of the first branch portion, the second region is disposed between the first region and the third region, and connected to the first region and the third region, the second region comprises other one part of the second branch portion and other one part of the first branch portion.