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

Claim 17:
18. The self-coherent receiver based on polarization-independent delay interferometers according to claim 3, wherein each of the first reflection module and the second reflection module comprises a sixth Sagnac ring composed of a twentieth polarization beam splitter; 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 twentieth polarization beam splitter are connected directly by a polarization-maintaining optical fiber;
the sixth Sagnac ring is configured to reflect optical signals input through two paths, and to rotate a horizontal polarization component and a vertical polarization component of each of the optical signals input through two paths respectively to a vertical polarization component and a horizontal polarization component correspondingly, and output rotated optical signals from corresponding input ports.