Device utilizing single longitudinal mode dual wavelength fibre laser to generate microwave and millimeter wave

Abstract

The invention relates to a device utilizing a single longitudinal mode dual wavelength fibre laser to generate a microwave and a millimeter wave and a working method thereof. The device comprises a pump laser, a wavelength division multiplex optical coupler, an ultrashort linear cavity resonator, an optoisolator and a high-speed photodetector which are sequentially connected to form the device, wherein the ultrashort linear cavity resonator comprises a low reflectivity fiber grating, an active optical fibre and a high reflectivity fiber grating which are sequentially connected to form the device. The device uses the two fiber gratings as reflecting mirrors of the laser, and selects the active optical fibre with proper length as a gain medium for the laser, so as to form the ultrashort linear cavity resonator by combination; the frequency-selective property of the ultrashort linear cavity resonator and the wavelength-selective property of the fiber gratings are utilized for realizing the single longitudinal mode dual wavelength output of lasers; and the single longitudinal mode dual wavelength lasers are coupled into a high-speed photodetector, and microwave signals and millimeter wave signals are generated by frequency beating. The method has the characteristics of simple structure, low cost, narrow microwave and millimeter wave signal bandwidth, low noise, etc.

Description

(1) Technical field: [0001] The invention relates to the fields of optical fiber communication and optical fiber sensing, in particular to a device for generating microwave and millimeter waves using a single longitudinal mode dual-wavelength optical fiber laser, which is mainly used for optical fiber communication, optical fiber sensing, radar and radio-frequency optical fiber transmission (Radio-over -fiber) and other fields. (two) background technology: [0002] Microwave and millimeter wave signals generated by photons are widely used in the fields of optical fiber communication and optical fiber sensing. application. The advantage of this technology is that it uses photon technology to replace the traditional method of generating millimeter-wave signals by frequency doubling of lower-frequency electrical signals to generate microwave and millimeter-wave signals, and the signals can be transmitted through single-mode optical fibers with extremely low loss. , long-dista...

AI Technical Summary

Problems solved by technology

At present, photon technology is used to generate microwave and millimeter wave signals. One is to generate microwave and millimeter wave signals based on phase shaping technology, but this method is difficult to obtain narrowband, high-quality microwave and millimeter wave signals; the other is based on external modulation technology. The intensity modulator or phase modulator doubles the frequency of the laser source to generate microwave and millimeter wave signals, but this method requires a high-quality reference signal source; the third is based on optical heterodyne technology, the two laser beams emitted from different laser sources are first Phase locking to reduce phase noise, and then beat frequency to generate microwave and millimeter wave signals; but this method also requires a high-quality reference signal source, however, in practical applications, especially in wireless communication and radar systems, millimeter wave generation The device is generally used as a local oscillator, and there is no reference signal source available

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