Patent ID: 11949461
Assignee: BEIJING ZHONGKE GUOGUANG QUANTUM TECHNOLOGY CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The integrated self-coherent receiving optical chip based on round-trip delay interferometers according to claim 1, wherein the non-reciprocal polarization rotation modules comprise four identical polarization rotation optical waveguides, and
wherein each of the four identical polarization rotation optical waveguides comprises a half-wave plate optical waveguide and a Faraday rotation optical waveguide that are closely connected; a polarization rotation angle of each of the Faraday rotation optical waveguides is 45°; and
each of the first optical waveguide, the second optical waveguide, the third optical waveguide, and the fourth optical waveguide comprises a polarization rotation optical waveguide.