Mirror image rejection down-conversion receiving system and method based on photoelectric oscillator

Abstract

The invention discloses a mirror image rejection down-conversion receiving system and method based on a photoelectric oscillator, and mainly relates to the field of optical communication and the technical field of microwave photons. The system comprises a photoelectric oscillator loop and a down-conversion oscillation loop, the photoelectric oscillator loop comprises a laser, a first phase modulator, an optical amplifier, a first optical circulator, a first phase shift Bragg grating, a first photoelectric detector and an electric coupler, and selective amplification receiving of radio frequency input signals is achieved; and the down-conversion oscillation loop comprises a second phase modulator, a second circulator, a second phase shift Bragg grating, a second photoelectric detector, an electric amplifier and an electric beam splitter, and down-conversion output of the radio frequency input signal is realized. The beneficial effects of the invention are that the system does not need external local oscillator signal source input, the input IM signal is filtered through the frequency selection characteristic of the photoelectric oscillator, the 'mismatch problem' in the phase cancellation technology can be avoided, and the applicable frequency range can be tuned by tuning the frequency of the laser.

Description

technical field [0001] The present invention relates to the field of optical communication and the field of microwave photon technology, in particular to a photoelectric oscillator-based image suppression down-conversion receiving system and method. Background technique [0002] In existing radar and communication applications, the RF front-end is mainly based on microwave electronic technology to realize signal frequency conversion and transmission. With the increase of processing frequency, the traditional RF front-end faces "electronic bottlenecks" such as large transmission loss, difficult high-frequency processing, limited bandwidth, poor isolation, and susceptibility to electromagnetic interference, and cannot solve the needs of multi-band and multi-function. The resulting electronic devices are complex, heavy, high power consumption, and high cost. [0003] The frequency down-conversion based on microwave photonic technology is to modulate the radio frequency signal ...

AI Technical Summary

Problems solved by technology

Although this type of method has the advantage that the applicable frequency is not limited, it also has the problem of reduced IM suppression performance caused by phase and amplitude mismatch, and needs to input a specific local oscillator signal to achieve frequency conversion.

Images