Method for regulating and generating various phase pulses in photonic microwave signal generator

Abstract

The invention discloses a method for regulating and generating various phase pulses in a photonic microwave signal generator. A microwave signal generator is formed by a broadband light source (100), a light intensity modulator (101), an electric pulse generator (102), a fiber Bragg grating string (103), an adjustable band pass filter (104), an optical amplifier (105), dispersive medium (106) and a photoelectric converter (107); a tunable spectrum structure unit (108) is formed by the fiber Bragg grating (FBG) string (103) and the adjustable band pass filter (104); and on the basis of the above-mentioned structure, the spectrum structure is scrambled and overlapped in shape to different extents in the dispersive medium (106) so as to generate the pulses in different shapes. The method disclosed by the invention has the advantages of simple structure and good tenability, and can be applied to a plurality of important fields such as microwave antenna, military radars, sensor networks and the like.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a technique for generating microwave signals by using a photon method, which is suitable for tunablely generating microwave signals of different envelope shapes. Background technique [0002] With the development of microwave communication technology, microwave signal generating equipment has been widely used, such as microwave antenna, military radar and different sensor networks. At present, microwave signal generators mainly use microwave circuit technology, but with the urgent demand for large-capacity, ultra-wideband and high-speed communications and the further development of my country's Internet of Things project, the signal generation rate of existing microwave signal generators And tunability, etc. put forward higher requirements. For this reason, in recent years, a method of generating microwave signals through photon technology, that is, microwave photon signal ge...

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Problems solved by technology

[0003] At present, there are mainly the following schemes to realize the generation of tunable microwave photonic signals based on the technology of optical frequency domain to time domain mapping: (1) Based on the technology of spatial light modulation and shaping, different spatial light modulation technologies are used to construct the required The shape of the spectrum, and then by virtue of the mapping from the frequency domain to the time domain and photoelectric conversion, the microwave signal of the desired shape can be obtained. This scheme has strong tunability, but the structure of the spatial light modulation device is large and expensive; (2) Based on the technology of all-fiber spectral shaping, through the tunable filter of all-fiber structure, the mapping from the optical frequency domain to the time domain is carried out or simultaneously, and then the microwave signal of the corresponding shape can be obtained by photoelectric conversion.

Through this scheme, the generation of sinusoidal signals, triangular signals, and ultra-wideband signals has been realized through different spectral construction devices, but the tunable generation of sinusoidal signals, triangular signals, and ultra-wideband signals in a single device has not been realized; (3) Based on the scheme of all-fiber spectral shaping and second-order dispersion medium, this scheme is an extension of scheme two, and the nonlinear frequency-domain to time-domain mapping through second-order dispersion can generate microwave signals with chirp

[0004] The above three schemes all use microwave photonic technology to realize the generation of tunable microwave signals. Among them, scheme one has good tunability, but the spectrum shaping is complicated. Schemes two and three propose different spectrum shaping technologies based on all-fiber , but it cannot realize the generation of any microwave signal of a single module, and the flexibility is poor, which restricts the development of the field of microwave communication

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