A Model Method for Large Dynamic Signal Demodulation 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 method based on phase modulation; the method includes generating multi-wavelength lasers locked by the interval of comb teeth, and performing optical power amplification to increase the power of each comb tooth Optical power; generate dual-tone radio frequency signals with similar frequencies, and load the positive / negative frequency sidebands of the radio frequency signals to the multi-wavelength laser respectively, and transmit them to the optical filter module for amplitude adjustment and spurious filter suppression; output the optical filter module One of the optical signals is directly output after passing through the photoelectric detection module, and the other optical signal generates a feedback signal through the frequency locking control module; the feedback signal is output to the optical frequency source comb to adjust its absolute comb frequency, and finally the photoelectric detection module Output a large dynamic RF signal that can effectively suppress the third-order intermodulation signal. The invention provides a phase-locked multi-wavelength laser to realize precise adjustment and suppression of high-order stray signals, thereby improving the third-order intermodulation value and dynamic range of the link.

Description

technical field [0001] The invention belongs to the field of microwave photon technology, in particular to a large dynamic signal demodulation model method 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...

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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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