System and method for generating multicarrier signals with high flatness and high sideband suppression ratios

Abstract

The invention provides a system and method for generating multicarrier signals with high flatness and high sideband suppression ratios, and relates to the technical field of optics, microwave and microwave photonics. Multicarrier signals with the high flatness and the high sideband suppression ratios are generated in an optical frequency comb manner to solve the existing problem of multichannel microwave radio frequency signal generation problem within wide broad frequency coverage and acquire the multicarrier signal with a large bandwidth, good flatness and large carrier number. The invention provides an SSB-OCS generation method based on three MZMs connected in parallel, wherein two MZMs work in a single sideband modulation mode, and the other MZM works in an even order suppression mode so as to generate SSB-OCS signals with high sideband suppression ratios in combination with optical phase shift control of 90 degrees. Then, with the proposed SSB-OCS signal generation and optical frequency shift loop as a core, an oscillating circuit is formed in the optical domain to perform circular frequency shift so as to generate the multicarrier signals with high flatness and high sideband suppression ratios.

Description

technical field [0001] The invention relates to a system and method for generating a multi-carrier frequency signal with high flatness and high sideband suppression ratio, and belongs to the field of microwave photon technology. Background technique [0002] On-board microwave communication forwarding technology is developing toward larger capacity, more on-board processing functions, and stronger anti-jamming capabilities, and the communication frequency band of satellite payloads is gradually expanding from S-band to Ka-band accordingly. With the development of satellite payload technology and the continuous improvement of on-board microwave forwarding requirements, the multi-band integrated RF front-end has become a key development direction of broadband communications in the future, which also puts forward new requirements for the comprehensive reception and processing of multi-band broadband microwave signals. [0003] In the satellite payload RF front-end, the local os...

AI Technical Summary

Problems solved by technology

The frequency of the local oscillator signal generated by the current crystal oscillator is low, and the electronic frequency multiplication method is used to generate the local oscillator signal with complex structure and high phase noise, while the tuning range of the local oscillator signal generated by the dielectric resonator is extremely narrow

The frequency of the local oscillator source generated by the above-mentioned electronic technology is single, and it is impossible to realize multi-carrier frequency generation at the same time

In addition, multi-channel transmission and feeding through RF cables also have problems in large-scale feeding, anti-electromagnetic interference and low quality, which cannot meet the high linearity and large bandwidth receiving and processing requirements of the multi-band integrated RF front-end

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