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

Claim 5:
6. 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 a second notch groove, a second half-wave plate and a first Faraday rotation plate, and wherein the second notch groove is configured to transversely run through the first optical waveguide, the second optical waveguide, the third optical waveguide, and the fourth optical waveguide;
the second half-wave plate and the first Faraday rotation plate are aligned and tightly attached, and are placed in the second notch groove; and
an angle between a main axis of the second half-wave plate and a horizontal direction is 22.5°, and a polarization rotation angle of a Faraday rotation optical waveguide is 45°.