Tunable single passband microwave photonic Hilbert transform filter system

Abstract

The present invention discloses a tunable single pass band microwave photonics Hilbert transform filter system that is based on broad spectrum light source polarization processing and combines with spectral notch phase shift and dispersion integral effect. The system comprises an amplification spontaneous emission broad spectrum light source, an optical fiber Bragg grating, a first polarization polarizer, a first polarization controller, a polarization beam splitter, an adjustable light delay line, an adjustable light attenuator, a phase shift optical fiber grating, a polarization beam combiner, a second polarization controller, a polarization modulator, a third polarization controller, a second polarization polarizer, a dispersion compensation module, and a high-speed photoelectric detector that are all connected with the amplification spontaneous emission broad spectrum light source. According to the system, random tuning of the spectrum position of the bandpass Hilbert transform is realized through turned light delay in a broad spectrum microwave band, so that the Hilbert transform of the bandpass microwave signal is realized. In addition, the system output has no base frequency response and no periodic spectral response, and ensures the singleness and immunity of channel selection.

Description

technical field [0001] The invention relates to the technical field of microwave photonics (Microwave Photonics), and more specifically relates to a tunable single-passband microwave photon Hilbert transform filter system utilizing phase shift grating and fiber dispersion technology combined with polarization multiplexing modulation. Background technique [0002] In modern satellite, wireless communication, and radar detection, it is often necessary to perform signal processing on multi-band high-frequency microwave / millimeter waves, so as to obtain the amplitude and phase characteristics of the electromagnetic signal transmission process, and realize the measurement of the instantaneous frequency of captured information. [0003] The Fourier transform method is a commonly used frequency measurement method, but this method gives the average change of the signal within a certain period of time, and cannot reflect the relationship between frequency and time. At present, the mo...

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Problems solved by technology

[0006] Aiming at the above situation, the present invention provides a tunable single-passband microwave photon Hilbert transform filter system based on broad-spectrum light source phase-shifting and trapping through polarization processing combined with dispersion integration effect. This system can be used in the DC-20GHz microwave frequency band Realize the band-pass Hilbert transform of any passband microwave signal within a certain range, so as to solve the problems of complex structure, serious crosstalk and poor reconfigurability faced by the band-pass Hilbert transform system based on high-frequency microwave electronic devices

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