Patent ID: 11923909
Assignee: BEIJING ZHONGKE GUOGUANG QUANTUM TECHNOLOGY CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 12:
13. The self-coherent receiver based on polarization-independent delay interferometers according to claim 2, wherein each of the first reflection module and the second reflection module comprises a third Sagnac ring composed of a seventeenth polarization beam splitter and a fourth Sagnac ring composed of an eighteenth polarization beam splitter; and the first long-arm optical fiber, the first short-arm optical fiber, the second long-arm optical fiber and the second short-arm optical fiber are all polarization-maintaining optical fibers;
two output ports of the seventeenth polarization beam splitter are directly connected with each other by a polarization-maintaining fiber; two output ports of the eighteenth polarization beam splitter are directly connected with each other by a polarization-maintaining fiber;
the third Sagnac ring and the fourth Sagnac ring are respectively configured to reflect an input optical signal, and to respectively rotate a horizontal polarization component and a vertical polarization component of the input optical signal to be a vertical polarization component and horizontal component.