Microwave frequency conversion method and apparatus

Abstract

The invention relates to the microwave photon field, especially to a microwave frequency conversion method and apparatus. The apparatus is composed of a fiber laser, a polarizing beam splitter, an electro-optic modulator, a polarizing controller, a fiber coupler and a photoelectric detector. The fiber laser, the polarizing beam splitter, and the photoelectric detector are successively connected and then are coupled to one input terminal of the fiber coupler; the polarizing beam splitter and the polarizing controller are connected and then are coupled to the other input terminal of the fiber coupler; and the output terminal of the fiber coupler is connected with the photoelectric detector and the photoelectric detector outputs a converted frequency conversion signal. According to the invention, a microwave local oscillator signal source in the traditional frequency conversion way does not need to be provided and conversion from a broadband microwave signal to an intermediate frequency signal can be realized.

Description

Technical field: [0001] The invention relates to the field of microwave photons, in particular to a microwave frequency conversion method and device, which are mainly used in the fields of radar communication and optical radio transmission. Background technique [0002] Using optical means to generate high-quality microwave signals and integrating optical fiber transmission, high-speed optoelectronic devices and microwave signal radiation transmission in space has become the development direction of the next generation of wireless communication. Photogenerated microwave technology uses lasers, photodetectors and other devices to generate microwave signals optically. At present, the most commonly used optically generated microwave technology is the optical beat frequency method. The microwave signal generated by the optical beat frequency method mainly relies on coherent narrow linewidth lasers with two frequencies close to each other. At present, the optically generated mic...

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Problems solved by technology

[0003] One is to use two independent lasers to beat frequency to generate microwave signals, one of which has a fixed frequency and the other has an adjustable frequency, and uses an optical phase-locked loop to lock the phases of the two lasers, but this method is technically difficult not conducive to practical

[0004] The other is to use the same laser to generate lasers of two frequencies through related technical means, so that the microwave signal can be output directly, and the tuning of the microwave signal can be realized by changing the birefringence effect of the linear cavity fiber laser to change the frequency interval of the two lasers, but This method of applying stress to the laser fiber is random, which is not conducive to automatic control, and the whole laser is easily affected by environmental factors, it is difficult to realize the tuning of the beat frequency signal, and the gain balance of the two wavelength lasers in the cavity is not easy to guarantee

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