All-optical technology microwave receiving system and method
A technology of microwave receiving and optical technology, applied in the field of all-optical technology microwave receiving system, to achieve the effect of simplifying the structure of the base station, reducing the operating cost and increasing the working bandwidth
Active Publication Date: 2019-04-30
HUNAN INST OF TECH
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Problems solved by technology
[0004] The technical problem to be solved in the present invention is: 1, provide a kind of ultra-broadband microwave receiving method based on photon technology, its frequency conversion process is finished in optical domain, can overcome the negative impact of mixer and local oscillator on system performance, adopt simultaneously The "optical mixing" method is used to down-convert the microwave signal and realize the intermediate frequency output. It does not require high-frequency active devices such as local oscillators, which can minimize the electromagnetic interference of the system.
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[0030] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.
[0031] It should be noted in advance that in the description of the present invention, the terms "upper branch" and "lower branch" are only for those skilled in the art to distinguish the two branches when reading the present invention, rather than limiting the orientation . In addition, the numbers such as "1" and "2" after the names of the components are only for those skilled in the art to distinguish between two components of the same type when reading the present invention, and cannot be understood as indicating or implying relative importance The quantity of the indicated part is specified or implied.
[0032] The present invention is mainly based on the following ideas: modulate the ...
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The invention discloses an all-optical technology microwave receiving system and method, and relates to the technical field of microwave receiving. Based on a major concept, the method comprises the following steps: modulating laser intensity of a received microwave signal through an electro-optic intensity modulator, and implementing electro-optic conversion to form an optical signal 1 branch; constructing an optic-electric hybrid loop of which an open-loop gain is larger than 1, generating optic-electric hybrid oscillation on the basis of a 'self-excited oscillation' principle, and coupling a part of oscillated optical signals to form an optical signal 2 branch; coupling the optical signals of the two branches, and transmitting the coupled optical signals to a central station through an optical fiber; amplifying the two optical signals, compensating for the transmission loss of the two optical signals, performing 'optical mixing' through envelope detection of a photoelectric detector, and performing low-pass filtering to realize intermediate-frequency output; and finally, performing analog / digital conversion on an intermediate-frequency output signal, and performing digital signal processing.
Description
technical field [0001] The invention relates to the field of microwave receiving technology, in particular to an all-optical technology microwave receiving system and method. Background technique [0002] Microwave photon technology involves two fields of microwave and photon technology. It is an emerging discipline. It usually refers to the use of advanced photon technology to break through the electronic bottleneck for the generation, transmission, processing and reception of microwave signals. Optical fibers have the characteristics of large bandwidth, low loss, anti-electromagnetic interference, and light weight, and are widely used in the field of microwave photonics to generate, transmit, and process microwave signals. [0003] The structure of the existing microwave receiving system is as follows: figure 1 As shown, it usually mixes the high-frequency microwave signal and the local oscillator signal through a mixer to realize the down-conversion of the microwave sign...
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IPC IPC(8): H04B10/54H04B10/61H04B10/64H04B10/69
CPCH04B10/54H04B10/61H04B10/64H04B10/6972
Inventor 洪俊彭志强李祖林姚胜兴王小虎张松华
Owner HUNAN INST OF TECH