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

Claim 1:
2. The self-coherent receiver based on polarization-independent delay interferometers according to claim 1, wherein the first polarization-independent delay interferometer comprises a second beam splitter, a first long-arm optical fiber, a first short-arm optical fiber and a first reflection module;
the second beam splitter is configured to split an input first signal light component to generate a first long-arm component and a first short-arm component, wherein the first long-arm component and the first short-arm component correspondingly enter the first long-arm optical fiber and the first short-arm optical fiber respectively;
the first reflection module is configured to respectively reflect the first long-arm component transmitted through the first long-arm optical fiber and the first short-arm component transmitted through the first short-arm optical fiber, such that a horizontal polarization component and a vertical polarization component of each of the first long-arm component and the first short-arm component are respectively rotated to be vertically polarized and horizontally polarized;
the second beam splitter is further configured to interfere the reflected first long-arm component and the reflected first short-arm component to generate the first interference optical signal and the second interference optical signal;
the second polarization-independent delay interferometer comprises a third beam splitter, a second long-arm optical fiber, a second short-arm optical fiber, a first phase shifter and a second reflection module;
the third beam splitter is configured to split an input second signal light component to generate a second long-arm component and a second short-arm component, wherein the second long-arm component and the second short-arm component correspondingly enter the second long-arm optical fiber and the second short-arm optical fiber respectively;
the second reflection module is configured to respectively reflect the second long-arm component transmitted through the second long-arm optical fiber and the second short-arm component transmitted through the second short-arm optical fiber, such that a horizontal polarization component and a vertical polarization component of each of the second long-arm component and the second short-arm component are respectively rotated to be vertically polarized and horizontally polarized;
the first phase shifter is configured to adjust a phase of the second short-arm component, so that a phase difference between the second short-arm component and the second long-arm component is π/2;
the third beam splitter is further configured to interfere the reflected second long-arm component and the reflected second short-arm component to generate the third interference optical signal and the fourth interference optical signal.