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Optical generation method and system for radio frequency arbitrary waveform based on digital logic operation

A digital logic, arbitrary waveform technology, applied in the field of RF arbitrary waveform light generation, can solve the problems of digital signal difficulty and so on

Active Publication Date: 2018-07-06
TSINGHUA UNIV
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  • Claims
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Problems solved by technology

For electronic devices, it is difficult to generate digital signals with high code rates.

Method used

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  • Optical generation method and system for radio frequency arbitrary waveform based on digital logic operation
  • Optical generation method and system for radio frequency arbitrary waveform based on digital logic operation
  • Optical generation method and system for radio frequency arbitrary waveform based on digital logic operation

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Embodiment

[0056] This embodiment takes PDAC system bit number n=2 as an example to test the solution of the present invention. In the experiment, the wavelengths of the two lasers are set to be 1554.985nm and 1557.404nm respectively, and the power ratio is 1:2. The signal generated by the target is a 10GHz sine wave. The signal is sampled and quantized with 2 bits at a sampling rate of 24Gb / s, and the required 12Gb / s digital signal is derived from the XOR logic relationship for each bit of data. Two pairs (four channels) of 12Gb / s non-return-to-zero code microwave digital signals generated by a microwave digital signal generator, these two pairs of non-return-to-zero code microwave digital signals are sent to two double-drive Mach The RF input port of the Zender modulator is used to modulate two optical signals respectively. The two modulated optical signals are coupled to an optical path through a 50:50 optical coupler, and sent to a photodetector to complete photoelectric conversion, ...

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Abstract

The invention provides an optical generation method and system for a radio frequency arbitrary waveform based on a digital logic operation, belonging to the field of arbitrary waveform generation. Thesystem comprises n optical power modulation units, a wavelength division multiplexer or an optical coupler, a photodetector and a filter, wherein each optical power modulation unit comprises a laser,a modulator, two microwave phase shifters and a digital signal generator. The method comprises the following steps: generating n pairs of digital signals according to an expression of a target radiofrequency analog signal waveform and a logic operation relationship realized by the modulator, correspondingly generating non-return-to-zero code microwave digital signals by using the digital signalgenerator, inputting each pair of non-return-to-zero code microwave digital signals to the modulator to perform intensity modulation on a path of laser, obtaining n paths of optical signals, and thencoupling the n paths of optical signals into one path of optical signal, converting the optical signal into an electric signal, and finally obtaining the target radio frequency analog signal waveformthrough the filter. According to the scheme of the invention, the range resolution of radars, satellite detection systems and other systems can be effectively improved, and high-precision imaging canbe realized.

Description

technical field [0001] The invention relates to the technical field of arbitrary waveform generation, in particular to a method and system for generating radio frequency arbitrary waveform light based on digital logic operations. Background technique [0002] Radio frequency arbitrary waveform generation technology plays an important role in imaging radar, communication, satellite remote sensing and other fields, but limited by the bottleneck of electronic devices, the signal generated by traditional direct digital frequency synthesis, electrical digital-to-analog conversion and other electrical arbitrary waveform generation methods Bandwidth and frequency can no longer meet the demand. With the help of the anti-electromagnetic interference and high frequency (THz level) characteristics of light, the method of generating radio frequency arbitrary waveform based on light has attracted extensive attention of researchers in recent years. Among them, there are mainly frequency-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/54H04B10/27
CPCH04B10/27H04B10/541
Inventor 郑小平彭韶文李尚远薛晓晓
Owner TSINGHUA UNIV
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