A large dynamic signal demodulation model device based on phase modulation

Abstract

The invention belongs to the field of microwave photon technology, and specifically relates to a large dynamic signal demodulation model device based on phase modulation; the demodulation model device includes an optical frequency comb source, an optical amplification module, a phase modulation module, a radio frequency source module, and an optical filter Module, frequency locking control module and photoelectric detection module, the optical frequency comb source is connected to the optical input port of the phase modulation module after the optical amplification module, and the radio frequency signal output by the radio frequency source module is connected to the radio frequency input port of the phase modulation module at the same time, and the phase modulation The optical signal output by the module is divided into two paths after being processed by the optical filter module: the first path is connected with the frequency locking control module to generate a feedback signal and output to the optical frequency comb source, which controls and adjusts the absolute comb frequency of the optical frequency comb source; the second path It is connected with the photoelectric detection module to generate and output radio frequency signals; the invention uses the optical frequency comb source to provide phase-locked dual-wavelength lasers to realize precise adjustment and suppression of high-order spurious signals, thereby improving the third-order intermodulation value and dynamic scope.

Description

technical field [0001] The invention belongs to the field of microwave photon technology, in particular to a large dynamic signal demodulation model device based on phase modulation. Background technique [0002] The transmission characteristics of large dynamic and broadband radio frequency signals are the core requirements of electronic information equipment such as next-generation radar, electronic warfare, and communication. However, using the coaxial cable commonly used for radio frequency signal transmission as the transmission medium has many problems such as large volume, heavy weight, weak anti-electromagnetic interference ability, and large loss. Microwave photonic technology modulates radio frequency signals onto optical carriers, and uses optical fiber as the transmission medium for long-distance transmission; this technology has the following unique advantages: [0003] (1) The optical fiber is small in size, light in weight, and good in flexibility; (2) Strong...

AI Technical Summary

Problems solved by technology

Several methods have their own advantages and disadvantages. The phase-locked loop has a large dynamic range, but its bandwidth is usually less than GHz due to the phase-locked delay; the cascaded optical filter has the advantages of high linearity, large dynamics and large bandwidth, but Its bias point control is more complex in the system, and the dual-wavelength third-order intermodulation cancellation has the characteristics of large dynamic and large bandwidth, but the independent dual light source makes the system more complex in light source control and optical filtering, which seriously limits the phase-based modulation. Wide application of large dynamic microwave optical links

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