Microwave signal phase shifting method based on polarized light interference technique

Abstract

The invention discloses a microwave signal phase shifting method based on polarized light interference technique in the technical field of microwave photonics. Photonic microwave signals generated by modulating a single sideband are transmitted by a polarization maintaining fiber and generate a group of optical carrier with locked phase and vertical polarization in a polarization manner by using the high birefringence characteristics and an appointed fusion angle. The input vertically-polarized optical carriers can generate different phase shift under the bias voltage of a phase modulator according to the polarization relativity of the modulation efficiency of the phase modulator, so that the phase difference among the optical carriers can be changed by adjusting the bias voltage. Then, the optical carriers are received by an analyzer with an appointed polarization angle to generate a group of parallel-polarized phase-shifting optical carriers. A photoelectrical detector can generate an electrical domain microwave phase-shifting signals after receiving beat frequency and isolating DC components, wherein the phase shifting magnitude depends on the bias voltage of the phase modulator. The invention further lowers the complexity of the microwave phase shifting system, and improves the phase shifting accuracy.

Description

technical field [0001] The present invention relates to a signal processing method in the field of microwave technology, specifically, a microwave signal phase shifting method based on polarized light interference technology. Background technique [0002] Microwave phase shifter is the core component of phased array radar, satellite communication, and mobile communication equipment. Its operating frequency band and insertion loss directly affect the anti-interference ability and sensitivity of these equipment, as well as the weight, volume and cost of the system. Therefore It is of great significance to study the phase shifter with wideband and low insertion loss in the field of military and civil satellite communication. In recent years, with the continuous progress in the research on optical waveguide and modulation technology, not only the optical fiber has been widely used as the transmission medium of communication signals and control signals in phased array radar, sate...

AI Technical Summary

Problems solved by technology

This type of photonic microwave phase shifter can control the beam more accurately and continuously, but at the same time, it modulates the amplitude of the photonic microwave signal, which introduces an uncertain additional phase shift, and the insertion loss increases, which further improves the stability of the device and The performance requirements of the system increase the cost

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