Microwave photonic image frequency rejection mixing method and device

Abstract

The invention discloses a microwave photonic image frequency rejection mixing method which comprises the steps of: respectively regulating a radio frequency signal and a local oscillation signal which are to be mixed to an optical domain to obtain a light-carrying radio frequency signal and a light-carrying local oscillation signal; and dividing the light-carrying radio frequency signal / light-carrying local oscillation signal into four paths, after respectively carrying out phase shifting on the four paths of optical signals by theta 1, theta 2, theta 3 and theta 4, respectively coupling the obtained optical signals with the light-carrying local oscillation signal / light-carrying radio frequency signal, then respectively converting the four paths of optical signals obtained after coupling into electric signals, and finally coupling the four paths of electric signals together after respectively carrying out phase shifting on the four paths of electric signals by (with reference to the specification) so as to obtain a mixed signal. Theta 1, theta 2, theta 3 and theta 4 for phase shifting meet the relationships that theta 2=theta 1+pi+2pi n1, theta 3=theta 1+pi / 2+2pi n2, and theta 4=theta 1+3pi / 2+2pi n3, wherein ni (i=1, 2, 3) is an integer; and (with reference to the specification) for phase shifting meets the relationship that (with reference to the specification), wherein ki (i=1, 2, 3) is an integer. The invention further discloses a microwave photonic image frequency rejection mixing device. The microwave photonic image frequency rejection mixing method and device have the advantages of high flexibility, high conversion efficiency, high linearity, high frequency broadband and simultaneous suppression on various strays.

Description

technical field [0001] The invention relates to a frequency mixing method, in particular to a microwave photon image frequency suppression mixing method and device, belonging to the technical field of microwave photonics. Background technique [0002] Microwave mixer is one of the most commonly used devices in microwave systems. Its flexibility, linearity, and high-frequency broadband characteristics have always been an urgent need for multi-functional system applications. However, traditional electronic-based microwave mixers often have disadvantages such as difficult reconfigurability, large signal distortion, narrow operating bandwidth, low operating frequency, and difficulty in suppressing radio frequency and local oscillator leakage. In order to meet the application requirements of different systems, it is urgent to solve the flexible reconfigurability and high-frequency broadband linear frequency conversion characteristics of microwave mixers. [0003] As one of the e...

AI Technical Summary

Problems solved by technology

However, only the image frequency component, RF and LO leakage components in the spurious components have been discussed so far

(Z.Z.Tang, and S.L.Pan, "A Compact Image-Reject and Single-Sideband Mixer with Suppression of LO Leakage Based on A Dual-Polarization Dual-Drive Mach-Zehnder Modulator," in the Avionics and Vehicle Fiber-Optics and PhotonicConference and the International Topical Meeting on Microwave Photonics 2016 (AVFOP&MWP 2016), Oct.31-Nov.3, 2016, Long Beach, California, USA) and other spurious components are not reported, such as the double intermediate frequency generated by the image frequency and signal component, and the double intermediate frequency component will be seriously aliased into the intermediate frequency signal when the broadband signal is mixed, and it cannot be separated in the frequency domain

[0004] On the other hand, the modulation format of the signal is often limited to meet the suppression of spurs or the improvement of frequency conversion efficiency

Due to the need to prevent local oscillator and radio frequency leakage, it is often required to implement carrier-suppressed single-sideband modulation for the frequency-converted signal, and this modulation format puts forward strict requirements on the carrier-suppressed ratio of the modulator, and often needs to cooperate with the filter as a limiting signal Bandwidth devices to assist in the implementation (Berceli, T."New methods for subcarrier type optical reception applying new single sideband optical-microwave mixers."MicrowaveSymposium Digest, 1994.IEEE MTT-S International IEEE, 1994:1125-1128vol.2.); In addition, in order to improve the frequency conversion efficiency, the double sideband modulation format has also been proposed (Chan E H W, Minasian R A."MicrowavePhotonic Downconverter With High Conversion Efficiency,"Journal of LightwaveTechnology, 2012,30(23):3580-3585.), similarly, This solution still needs a filter to suppress the carrier to prevent local oscillator and radio frequency leakage, and it will also generate twice the radio frequency and twice the local oscillator component

[0005] At present, there is no solution that can realize unlimited signal modulation format and linear image frequency suppression mixing that can suppress multiple spurs, especially the suppression mixing of 2 times IF spurious signals

Images