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

Claim 0:
1. A self-coherent receiver based on polarization-independent delay interferometers, comprising: a first beam splitter, a first circulator, a second circulator, a first polarization-independent delay interferometer, a second polarization-independent delay interferometer, a first balanced detector, a second balanced detector and an electrical signal processing module;
the first beam splitter is configured to split a received signal light to generate a first signal light component and a second signal light component;
the first circulator is configured to transmit the first signal light component to a first port of the first polarization-independent delay interferometer; the second circulator is configured to transmit the second signal light component to a first port of the second polarization-independent delay interferometer;
the first polarization-independent delay interferometer has a long arm and a short arm for performing a polarization-independent delayed self-interference on the first signal light component to generate a first interference optical signal and a second interference optical signal respectively output from the first port of the first polarization-independent delay interferometer and a second port of the first polarization-independent delay interferometer; the second polarization-independent delay interferometer has a long arm and a short arm for performing a polarization-independent delayed self-interference on the second signal light component, so as to generate a third interference optical signal and a fourth interference optical signal respectively output from the first port of the second polarization-independent delay interferometer and a second port of the second polarization-independent delay interferometer, wherein a phase difference between the long arm and the short arm of the second polarization-independent delay interferometer is π/2;
the first circulator is further configured to transmit the first interference optical signal to the first balanced detector; the second circulator is further configured to transmit the third interference optical signal to the second balanced detector;
the first balanced detector is configured to perform a balanced detection on the first interference optical signal and the second interference optical signal to generate a first differential current signal; the second balanced detector is configured to perform a balanced detection on the third interference optical signal and the fourth interference optical signal, to generate a second differential current signal;
the electrical signal processing module is configured to receive the first differential current signal and the second differential current signal, and sample and process the first differential current signal and the second differential current signal, to restore service data.