A frequency hopping communication system based on a directly modulated laser and a method for generating a frequency hopping signal
A frequency hopping communication and laser technology, applied in transmission systems, electromagnetic wave transmission systems, electromagnetic transmitters, etc., can solve the problems of hopping speed limitations, restrictions, and radio frequency sources that are difficult to generate ultra-wideband.
Active Publication Date: 2021-04-27
CHINA SHIP DEV & DESIGN CENT
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Problems solved by technology
The phase-locked frequency synthesis completes the frequency synthesis through the phase-locked loop. This method has a simplified structure and high spectral purity; but due to the inherent delay of the feedback loop, its jump speed is limited
Direct digital frequency synthesis is a frequency synthesis technology based on digital signal processing. This method directly samples and digitizes the reference sinusoidal clock, and then performs frequency synthesis through digital computing technology. Because it uses a linear working method to output the required frequency, It has extremely fast frequency hopping speed, but limited by the resolution of the digital-to-analog converter, amplitude quantization errors will occur when the reference signal is digitized, which will affect the output spectrum and bring certain spurious signals
There are some technologies that combine the above two methods to make up for their respective shortcomings, but the existing technologies are limited by the bandwidth of electronic devices, and it is difficult to generate ultra-wideband radio frequency sources
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] see figure 1 , a frequency hopping communication system based on a direct modulation laser of the present invention includes a driving signal source, a direct modulation laser, an optical intensity modulator, a continuous light source, an electro-optical modulator, an optical coupler, a photodetector and a high-pass filter; The optical output end of the laser is connected to the optical input end of the optical intensity modulator, the signal output end of the driving signal source is respectively connected to the signal input end of the directly modulated laser and the intensity modulator, and the optical output end of the continuous light source is connected to the optical input end of the electro-optical modulator. The input end is connected, the optical output end of the optical intensity modulator and the electro-optical m...
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The invention provides a frequency hopping communication system and a frequency hopping signal generation method based on a direct modulation laser. In the form of optical heterodyne, an electric signal with amplitude jump is used to drive a direct modulation laser and a cascaded optical intensity modulator to obtain The optical carrier with frequency hopping; the other uses the electro-optic modulator to modulate the baseband electrical signal into light waves, combines the two optical signals and beats at the photodetector to obtain a broadband, high-speed frequency hopping radio frequency electrical signal. The solution of the invention is simple and efficient, supports ultra-large bandwidth and ultra-high switching speed, is widely used in ultra-wideband high-speed frequency-hopping communication systems, and has strong engineering practicability.
Description
technical field [0001] The invention belongs to the technical field of wireless communication over light, and in particular relates to a frequency-hopping communication system based on a direct modulation laser and a method for generating a frequency-hopping signal. Background technique [0002] Frequency hopping communication has good anti-interference and anti-interception capabilities, so it is widely used in various communication scenarios, especially in the field of military electronic countermeasures. An important module in the frequency hopping communication system is the frequency synthesizer, which is used to generate the radio frequency source for frequency hopping. The commonly used frequency synthesis techniques include phase-locked frequency synthesis, direct digital frequency synthesis and their combination. The phase-locked frequency synthesis completes the frequency synthesis through the phase-locked loop. This method has a simplified structure and high spect...
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IPC IPC(8): H04B10/50H04B1/7136
CPCH04B1/7136H04B10/503
Inventor 陶理王瑞黎梦雪王之立谭辉
Owner CHINA SHIP DEV & DESIGN CENT