Broadband microwave instantaneous spectrum measurement device based on Brillouin scattering

Abstract

The invention relates to a broadband microwave instantaneous spectrum measurement device based on Brillouin scattering. The device comprises a narrow-band light source, an optical splitter, a first electro-optical modulator, a Brillouin scattering medium, a second electro-optical modulator, a local signal source, an optical circulator, a photoelectric detector and a data collection module. By means of the Brillouin scattering phenomenon, high-resolution and high-operation-bandwidth instantaneous spectrum measurement is achieved. According to the device, by detecting a Brillouin gain signal, instantaneous spectrum information of frequency and power of a broadband microwave signal can be obtained.

Description

technical field [0001] The invention relates to microwave photon information, in particular to a broadband microwave instantaneous spectrum measurement device based on Brillouin scattering. Background technique [0002] With the continuous improvement of the information rate, the demand for electromagnetic signal characteristic analysis of high frequency and large bandwidth is also increasing. The electromagnetic characteristic analysis technology based on microwave photonics has its own ultra-wideband, good stability, high precision, anti-interference, etc. Advantages, it is gradually becoming one of the powerful tools for detecting and analyzing transmitted signals, and has good application prospects in the fields of civil communication, military electronic reconnaissance, and deep space and deep sea exploration. Among them, frequency measurement, as an important part of electromagnetic characteristic analysis technology, can be roughly divided into three types according t...

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Problems solved by technology

[0003] The first is optical domain spectrum measurement, and its mature representative is the spectrum analyzer based on diffraction grating. Spectral analysis technology with high spectral resolution can be realized through optical narrowband effect [JM.Subias Domingo, J.Pelayo, F.Villuendas, C.D.Hears, E.Pellejer, "Very high resolution optical spectrometry by stimulated Brillouin scattering," IEEE Photonic Tech.L., vol.17, no.4, pp.855-857, 2005], the measurement accuracy can reach 0.08pm, but This measuring device is only suitable for amplitude spectrum analysis of periodic signals;

[0004] The second is fast frequency measurement, which uses the inherent frequency / amplitude conversion mechanism in photonics such as dispersion inhomogeneity and nonlinear effects to realize fast real-time measurement of single / multi-tone electromagnetic signal frequencies [J.Zhou, S.Fu, S.Aditya, P.P.Shum, C.Lin, "Instantaneous microwave frequency measurement using photonictechnique," IEEE Photonic Tech.L., vol.21, no.15, pp.1069-1071, 2009], mainly used in receiver front-end Obtain the communication carrier frequency in real time. This technology is characterized by fast measurement speed, and its measurement period is often on the order of milliseconds or even shorter. It can process non-periodic signals. However, its defect is that it cannot be applied to arbitrary signals, especially frequency chirp Chirping broadband signal;

[0005] The third is time-domain chirp measurement, the purpose is to obtain the instantaneous frequency and power of the signal, so as to effectively evaluate the signal quality, and realize the time-domain chirp measurement is divided into complex spectrum inverse Fourier transform method [A.Villafranca, J.Lasobras , R. Escorihuela, A. Rafael, G. Ignacio, “Time-resolved Chirp Measurements using complex Spectrum analysis based on stimulated Brillouin Scattering,” Optical Fiber Communication Conference. Optical Society of America, 2008] and time-domain frequency / amplitude conversion methods [ S. Tammela, H. Ludvigsen, T. Kajava, M. Kaivola, "Time-resolved frequency chirp measurement using a silicon-wafer etalon," IEEE PhotonicTech.L., vol.9, no.4, pp.475-477, 1997], the former needs to rely on precise phase spectrum analysis technology, the system is complex and cannot be applied to arbitrary signals, while the key to achieve high-performance chirp measurement of the latter lies in the use of photonic narrow-band effects and filter devices

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