Microwave phase discrimination device and phase locking device based on microwave photon technology

Abstract

The invention discloses a microwave phase discrimination device based on a microwave photon technology, and the device comprises a light source which is used for providing an optical pulse sequence with a femtosecond-order pulse width; a phase discrimination module which is of a Sagnac ring structure in which a DP-DMZM is connected in series in a loop, and is used for modulating phases of two paths of microwave signals of which the frequencies are integral multiples of the repetition frequency of the optical pulse sequence to two orthogonal polarization states of the optical pulse sequence, and enabling forward and reverse propagated modulated optical signals to form interference at an output port of the Sagnac ring structure; a polarization separation module which is used for separating out two orthogonal polarization states in the two paths of optical signals output by the Sagnac ring structure; and a balance detection module which is used for carrying out balance detection on the two paths of separated horizontal polarization state optical signals and the two paths of separated vertical polarization state optical signals respectively to obtain phases of the two paths of microwave signals respectively. The invention further discloses a microwave phase locking device based on the microwave photon technology. According to the invention, the phases of two microwave signals can be independently and accurately detected at the same time, the structure is simple, and the implementation cost is low.

Description

Technical field[0001]The invention relates to a microwave phase discriminating device, in particular to a microwave phase discriminating device based on microwave photonic technology.Background technique[0002]Phase detectors have important applications in systems such as signal synchronization, low phase noise microwave extraction, distance measurement, and phase noise measurement. The accuracy of the phase detector determines the performance of these systems. Traditional microwave phase discrimination uses electric mixing, and the reference source is a single-frequency signal, which can only perform phase discrimination on a certain frequency. At the same time, the noise of the mixer is large, which has an important impact on the phase discrimination accuracy. The microwave phase noise generated by the microwave source is not particularly low, so the phase discrimination effect is not good. In summary, the traditional method of phase detection microwave has the disadvantages of poo...

AI Technical Summary

Problems solved by technology

But the polarization modulator is expensive, and when the optical pulse is used as a reference source, the extremely high peak power makes the polarization modulator very prone to irreversible damage

[0003] At present, the existing phase detectors use one modulator to detect one microwave. When multiple microwave signals need to be phase detected, multiple phase detectors need to be built. How to use one modulator to detect multiple microwave signals at the same time? The signals are independently phase-detected, and the microwave frequencies can be different, and there is no related research

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