Image frequency suppression mixing transmission method and device

Abstract

The present disclosure provides a method and device for image frequency suppression mixing transmission. The device includes: a remote end, including: a wide-spectrum light generating module for generating a spectrally shaped line-biased wide-spectrum optical signal; a radio frequency modulation module and a wide-spectrum optical signal The optical generation module is connected, and the linearly polarized wide-spectrum optical signal is modulated by the received RF signal to be mixed, and the polarization complex composed of the RF modulated optical signal with orthogonal polarization states and different delays and the unmodulated optical carrier is obtained. signal; and the central station, which receives the polarization multiplexed signal through a single-mode optical fiber and outputs a mixed signal, including: a local oscillator modulation module, which is used to realize the modulation of the optical carrier in the polarization multiplexed signal by the local oscillator signal, and obtain the positive polarization state The alternating radio frequency dimmed signal and the local oscillator dimmed signal; and the photodetection module, which is connected with the local oscillator modulation module, is used to project the polarization state orthogonal radio frequency dimmed signal and the local oscillator dimmed signal to the The same polarization direction and complete the photoelectric conversion, and output the image frequency suppression mixing signal.

Description

Technical field [0001] The present disclosure relates to the field of microwave photonic technology, in particular to a mirror frequency suppression mixing transmission method and apparatus. Background [0002] Microwave downconverters are an important part of microwave systems such as radar, electronic countermeasures, wireless communications, and satellite payloads. When the signal is downconverted, the underconversion signal frequency of the mirror frequency interference is the same as the frequency of the useful RF signal downconversion signal, which cannot be filtered by filtering, and it is necessary to use other means to achieve mirror interference suppression. In recent years, microwave photonic mirror frequency rejection mixers have received extensive research and attention due to their large bandwidth, immunity from electromagnetic interference, and integration with optically loaded RF systems. [0003] Microwave photonic mirror frequency rejection mixers are mainly im...

AI Technical Summary

Problems solved by technology

However, the tunability of electrical filters, the Fabry-Perot structure or the roll-off characteristics of optical filters based on Hilbert transform will limit the operating frequency range of the system, and the scheme based on the stimulated Brillouin scattering effect An additional broadband microwave source is required, increasing the cost and complexity of the system

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