US 12,306,439 B2
Optical waveguide multi-cascaded coupling mode division multiplexer
Tingyun Wang, Shanghai (CN); Chuanlu Deng, Shanghai (CN); Yi Huang, Shanghai (CN); and Xiaobei Zhang, Shanghai (CN)
Assigned to Shanghai University, (CN)
Filed by Shanghai University, Shanghai (CN)
Filed on Feb. 27, 2023, as Appl. No. 18/114,824.
Claims priority of application No. 202210210877.8 (CN), filed on Mar. 3, 2022.
Prior Publication US 2023/0280535 A1, Sep. 7, 2023
Int. Cl. G02B 6/12 (2006.01); G02B 6/122 (2006.01); G02B 6/125 (2006.01); G02B 6/14 (2006.01); G02B 6/26 (2006.01); G02B 6/27 (2006.01)
CPC G02B 6/125 (2013.01) [G02B 6/12 (2013.01); G02B 6/122 (2013.01); G02B 6/14 (2013.01); G02B 6/26 (2013.01); G02B 6/272 (2013.01); G02B 6/2773 (2013.01); G02B 2006/12164 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical waveguide multi-cascaded coupling mode division multiplexer, comprising an optical waveguide layer, wherein the optical waveguide layer comprises a first optical waveguide and a second optical waveguide;
the second optical waveguide comprises a transmission optical waveguide and a plurality of coupling structures;
each coupling structure comprises a coupling optical waveguide and a connecting optical waveguide;
the coupling optical waveguide and the transmission optical waveguide are connected through the connecting optical waveguide, wherein one end of the connecting optical waveguide is connected to one end of the coupling optical waveguide and another end of connecting optical waveguide is connected to one end of the transmission optical waveguide, another end of the transmission optical waveguide is connected to a side surface of another adjacent connecting optical waveguide, and another end of the coupling optical waveguide is a free end;
the coupling optical waveguide is parallel to the transmission optical waveguide; the lengths of the coupling optical waveguides in the coupling structures are obtained so that the power of the two superimposed optical waves is equal, and the phases of the modes in the waveguides of any two superimposed coupling structures are equal at the superposition position, such that the phase difference is 0, so that the maximum power of the optical waves after coupling and superposition is ensured;
the distance between the coupling optical waveguide and the first optical waveguide is smaller than that between the transmission optical waveguide and the first optical waveguide; and
when optical waves are propagated in the first optical waveguide, the coupling structures in the second optical waveguide are used for sequentially coupling the mode power of the first optical waveguide, the sequentially coupled mode power is superposed, and the coupled and superposed power is output at the output end.