A reconfigurable microwave photon down-conversion method and device

Abstract

A reconfigurable microwave photon down-conversion method, which aims to provide a down-conversion method that can meet the requirements of microwave photon down-conversion for arbitrary frequency bands and broadband radio frequency signals, and at the same time reduce the requirements for high-frequency electrical local oscillator signal sources. Avoid using high frequency electrical LO sources. Filter the optical frequency comb signal input in the optical frequency mixing structure to generate two optical carriers with different frequencies respectively to realize the optical local oscillator with adjustable frequency interval; pass the RF signal to be processed through the phase modulation in the optical mixing structure Modulated on one of the optical carriers, the electrical local oscillator signal is modulated on another optical carrier through another phase modulator in the optical frequency mixing structure, and the adjacent first-order optical sidebands generated by the phase modulation are beaten and determined by The photodetector detects and obtains the down-conversion signal; by changing the frequency interval of the optical local oscillator and setting the frequency of the electrical local oscillator, the reconfigurable microwave photon down-conversion of radio frequency signals of different frequency bands and bandwidths is realized.

Description

technical field [0001] The invention belongs to the technical field of microwave photons, and in particular relates to a reconfigurable microwave photon down-conversion method and a microwave photon down-conversion device. Background technique [0002] The mixer is an indispensable frequency conversion basic device in the communication system. With the high carrier frequency and large broadband optical carrier microwave system becoming the development trend of optical fiber communication in the future, the traditional electrical frequency conversion technology is limited by the working bandwidth, low isolation, and loss. It is becoming more and more difficult to meet the current demand due to the influence of problems such as large size and low conversion efficiency. Microwave photonic frequency conversion technology makes full use of the advantages of photonic technology, such as large bandwidth, low transmission loss, and high isolation, to realize down-conversion of high-...

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Problems solved by technology

Among them, the series or parallel electro-optical modulation method loads the radio frequency signal to be processed and the electrical local oscillator signal to two different electro-optic modulators respectively, uses an optical filter to select two modulated optical sidebands with adjacent frequencies, and then passes the photoelectric detection The beating frequency of the device is used to achieve down-conversion. This solution requires a high-frequency electrical local oscillator source, and due to the limitation of the filtering bandwidth of the optical filter, the frequency range of the RF signal to be processed is limited, and the conversion efficiency is low; The principle of electrical oscillation realizes the generation of high-quality local oscillator signals without additional high-frequency electrical local oscillator signals, but due to the existence of oscillation systems and broadband microwave devices, the complexity and cost of the system are increased; the optical frequency comb heterodyne method uses loading The modulated optical sideband of the RF signal to be processed and the optical frequency comb are used for heterodyne beat frequency, which can realize the down-conversion processing of RF signals in any frequency band without additional electrical local oscillator signals. However, since only the optical frequency comb is used as the optical local The frequency of the vibration source and down-converted intermediate frequency signal cannot be flexibly controlled, and it is difficult to deal with RF signals of different bandwidths

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