Microwave photon frequency multiplication and frequency shifting device and frequency shifting method

Abstract

The invention provides a microwave photon frequency multiplication and frequency shifting device and a frequency shifting method. An output optical port of a laser is connected with an input optical port of a modulator; an output optical port of the modulator is connected with a common input port of an MZI; the MZI outputs two light beams; one light beam passes through a PM and then enters an optical coupler together with the other light beam; an optical signal output by the optical coupler is connected with an optical input port of a BPD; a signal to be subjected to frequency shift is connected with a radio frequency input port of the modulator; and an electric signal output by the DDS is connected with a radio frequency input port of the PM. The device has the advantages of being simple in structure, large in bandwidth, small in stray distortion, capable of being expanded in a cascading mode and the like, the working frequency range and the signal bandwidth can be improved, the stray distortion of signals subjected to frequency shift is reduced, and the device has the advantage of resisting electromagnetic interference, can meet the requirement of radar target dynamic Doppler frequency shift simulation, has the advantages of extensible channels and multi-stage frequency shift accumulation, and is high in conversion efficiency and small in stray distortion.

Description

technical field [0001] The invention relates to the field of microwave photon technology and radar technology, in particular to a microwave photon frequency doubling and frequency shifting device and a frequency shifting method. Background technique [0002] Microwave frequency shifters have been widely used in systems such as electronic countermeasures, multiple access communications, and radar measurement. In electronic countermeasures systems, microwave frequency shifters can be used to impose false Doppler shift information on radar signals. For example, shifting the frequency of a 12GHz carrier frequency radar signal by 25kHz will output a false Doppler signal with a velocity of 312.5 m / s. target signal. In a frequency-steered array radar system, in order to form an array beam with a certain frequency difference, a microwave frequency shifter is needed to achieve multi-channel frequency shift of radar signals. [0003] Current electronic systems usually use microwave ...

AI Technical Summary

Problems solved by technology

The Doppler frequency shift generated by the fiber dispersion time-frequency mapping method depends on the fiber dispersion value, so the tuning is poor, and it is difficult to meet the needs of dynamic simulation of radar targets; the acousto-optic modulation method can only perform single-frequency frequency shift, and it is difficult to achieve multiple frequency shift; Microwave photon I / Q mixing efficiency is low and spurious distortion is serious

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