Device for generating millimeter wave signals by using double independent tunable fiber lasers

Abstract

The invention relates to a device for generating millimeter wave signals by using double independent tunable fiber lasers. A first nonlinear medium is connected with a first fiber laser, and a second nonlinear medium is connected with a second fiber laser; a first optical coupler is respectively connected with the first nonlinear medium and the second nonlinear medium, an optoisolator is connected with the first optical coupler, a second optical coupler is connected with the optoisolator, a third optical coupler is connected with the second optical coupler, a spectrograph is connected with the third optical coupler, and a first photodiode is connected with the third optical coupler; and a spectrometer is connected with the first photodiode, a second photodiode is connected with the second optical coupler, a narrow band filter is connected with the second photodiode, an amplifier is connected with the narrow band filter, and an antenna is connected with the amplifier. The device disclosed by the invention has the following beneficial effects: 1. the wavelengths of the lasers are tunable; 2. the phase relationship of optical signals is stable; and 3. the structure is simple.

Description

technical field [0001] The invention belongs to the field of optical fiber communication and optical fiber sensing, and in particular relates to a device for generating millimeter wave signals by using dual independently tunable optical fiber lasers. Background technique [0002] The use of photons to generate millimeter wave signals has a very wide range of applications in the fields of radar, optical fiber communication, optical sensing and radio frequency optical fiber transmission. method to generate millimeter wave signals. The signal generated by this method has low transmission loss in the optical fiber line, and the signal can be transmitted long-distance through the amplifier. [0003] At present, the mainstream optical microwave signal generation technology can be mainly divided into three categories: (1) optical heterodyne method, since two or more light sources are required for input, the stability of the phase difference between the optical signals cannot be gu...

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Problems solved by technology

[0003] At present, the mainstream optical microwave signal generation technology can be mainly divided into three categories: (1) optical heterodyne method, since two or more light sources are required for input, the stability of the phase difference between the optical signals cannot be guaranteed, which also leads to The generated microwave signal is affected by phase noise

(2) Frequency-time domain mapping method. The modulation method of microwave signals generated by this method is generally fixed to intensity modulation. It is difficult to directly realize high-order modulation formats by this method. Combined with spectral construction technology, the parameters of the generated microwave signal are often limited by the design of the spectral construction module

(3) The external modulation method is generally implemented by adding an intensity modulator at the sending end. It is the simplest and most effective method. It has high reliability and low cost, but it requires a high-quality reference signal source

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