A superheterodyne microwave photon receiving system and method

Abstract

The invention relates to a superheterodyne microwave photon receiving system, which includes an electrical preprocessing unit, a carrier laser, an electro-optical up-conversion unit, a local oscillator laser, a photoelectric down-conversion unit, an electrical local oscillator source, an intermediate frequency down-conversion unit, etc.; The processing unit is used to pre-select and filter the frequency band of the microwave signal to be tested and then input it to the electro-optic up-conversion unit; the electro-optic up-conversion unit is used to up-convert the microwave signal to the optical carrier output by the carrier laser to obtain the optical carrier microwave signal; the local oscillator laser is used for Generate all-optical local oscillator; the photoelectric down-conversion unit is used to use all-optical local oscillator to down-convert the optical microwave signal to high-frequency signal; the electric local oscillator source is used to generate high-frequency electric local oscillator; the high-frequency down-conversion unit is used Down-convert IF signals to low IF or baseband. The invention uses a two-stage frequency conversion method, combined with an ultra-wideband all-optical local oscillator, to replace the traditional pure electric frequency conversion and microwave photon frequency conversion methods, and solves the bottleneck of the frequency conversion technology in the ultra-wideband receiving technology.

Description

technical field [0001] The invention relates to the technical fields of microwave photons and microwave radio frequencies, in particular to a superheterodyne microwave photon receiving system and method. Background technique [0002] The current receiver system is traditionally based on pure electronic devices and technologies, and its typical system architecture has two types: heterodyne architecture and homodyne architecture. The heterodyne architecture down-converts the microwave signal to a low-intermediate frequency. It has good spurious suppression capabilities such as images and a large dynamic range, but the system is complex and the instantaneous bandwidth is small, so it is often used by high-end equipment such as spectrum analyzers. The homodyne architecture directly down-converts the microwave signal to the baseband. It has a simple structure and a large instantaneous bandwidth, but it has poor spurious suppression capabilities such as images and a small dynamic ...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that the existing technology is limited by the ultra-wideband electric local oscillator source, and there are spurious interferences, and the problem that low-frequency microwave signals cannot be effectively converted. The present invention provides an ultra-external The differential microwave photon receiving system makes the receiver have higher comprehensive application performance in terms of operating spectrum range, instantaneous bandwidth, image and spurious suppression, low nonlinearity, etc.

Images