Search

CN-122017388-A - Ultra-wideband pulse signal detection method based on time stretching

CN122017388ACN 122017388 ACN122017388 ACN 122017388ACN-122017388-A

Abstract

The invention belongs to the field of electromagnetic environment sensing, and provides a detection method of ultra-wideband pulse signals based on time stretching. The system consists of a wide-spectrum light source, a single-mode long optical fiber, an electro-optical modulator, a photoelectric detector, a data acquisition card and an industrial personal computer. The invention can stretch the signal time domain by utilizing the optical signal dispersion principle without depending on a heavy and expensive traditional oscilloscope, so as to realize the detection and sampling of ultra-wideband pulse signals with narrow time domain pulse width and extremely low duty ratio.

Inventors

  • HAO XUCHUN
  • Xu Haoru
  • YANG YAN
  • HOU HAILONG
  • Gao Muyao

Assignees

  • 北京航空航天大学

Dates

Publication Date
20260512
Application Date
20251229

Claims (8)

  1. 1. The ultra-wideband pulse signal detection method based on time stretching is characterized by comprising an ASE light source, an MZ electro-optical modulator, a single-mode long optical fiber, a data acquisition card and a photoelectric detector.
  2. 2. The ultra-wideband pulse detection method of claim 1, wherein the ASE light source is spectrally flat with a 3dB bandwidth of 1528-160nm.
  3. 3. The ultra-wideband pulse detection method of claim 1, wherein the ASE light source has an optical power of 10dBm.
  4. 4. The ultra-wideband pulse detection method of claim 1, wherein the MZ electro-optic modulator has a half-wave voltage of 5.58V.
  5. 5. The ultra-wideband pulse detection method of claim 1, wherein the single-mode fiber has a length of 50km. The dispersion coefficient was 17ps/nm×km.
  6. 6. The ultra-wideband pulse detection method of claim 1, wherein the data acquisition card has a sampling rate of 400MS/s.
  7. 7. The ultra-wideband pulse detection method of claim 1, wherein the photodetector has a bandwidth of 1GHz and is dc-blocking.
  8. 8. Use of ultra wideband pulse detection according to any of claims 1-7, characterized in that a gaussian pulse signal with a bottom width of 940ps is detectable.

Description

Ultra-wideband pulse signal detection method based on time stretching Technical Field The invention belongs to the field of electromagnetic environment sensing, and particularly relates to an ultra-wideband pulse signal detection method based on time stretching. Background With the development of electronic information technology, the detection requirement of electromagnetic environment is increasing, and the detection of nanosecond ultra-wideband pulse signals is crucial to the electromagnetic compatibility (EMC) design of electronic equipment. However, ultra wideband pulse signals have very narrow pulse widths and low duty cycles. Because of the small dynamic range, poor survivability, bulky equipment and high cost, the traditional signal acquisition system is difficult to meet the measurement requirements. Along with the maturation and application of microwave photonics, an electric field to be detected can be modulated on light through a photoelectric field sensor with a high damage threshold value, and laser carrying an electric signal is transmitted to the rear end for detection by utilizing an optical fiber. The problem of poor survivability is solved, because nanosecond level ultra-wideband signal time domain pulse width is extremely narrow, and the duty cycle is extremely low, although the front end probe can sense the ultra-wideband signal propagated in space, the back end is difficult to effectively carry out analog-to-digital conversion, and the system is difficult to capture complete waveforms. While measurements made using conventional oscilloscopes require equipment with extremely high sampling rates, such equipment is bulky and expensive. With the research and development of microwave photon technology, there is a method for researching photon time stretching at home and abroad, the time domain of a picosecond-level supercontinuum pulse light source is stretched by utilizing a dispersion principle, and then a radio frequency signal is modulated on the pulse light source, so that the time domain stretching of the radio frequency signal is realized, and the sampling pressure of back-end equipment is reduced. But such methods are more suitable for continuous signal stretching and acquisition, and for ultra wideband signals with a smaller duty cycle, it is difficult to modulate the light pulses effectively. Disclosure of Invention In order to overcome the defects in the technology, the invention provides a method for detecting an ultra-wideband pulse signal, which is used for modulating the ultra-wideband pulse signal on a wide-spectrum continuous light source and transmitting the ultra-wideband pulse signal through a single-mode fiber so as to realize effective modulation of the ultra-wideband pulse signal and reducing the sampling pressure of a back-end system through the dispersion effect of the optical fiber. The technical scheme of the invention is as follows: the ultra-wideband pulse detection method based on time stretching comprises a wideband ASE continuous light source, an MZ electro-optic modulator, a single-mode fiber, a data acquisition card, a photoelectric detector and an industrial personal computer; Preferably, the ASE continuous light source wave band range is C+L wave band, the spectrum flat 3dB bandwidth is 1528nm-1602nm, the optical power is 10dBm, and the ASE continuous light source wave band range is continuous natural noise in the time domain. Preferably, the MZ electro-optic modulator is biased at 0V. The half-wave voltage is 5.58V. Preferably, the single mode fiber has a length of 50km and a dispersion coefficient of 17ps/nm×km. Preferably, the data acquisition card is 16 bits, and the sampling rate is 400MS/s. Preferably, the bandwidth of the photodetector is 1GHz, and direct current is blocked. Preferably, the industrial personal computer comprises a radio frequency input interface and integrates time domain drawing software. Compared with the prior art, the invention has the beneficial effects that: the invention provides a system method for detecting ultra-wideband pulse signals, which has the advantages of low cost, small occupied space, low requirement on required hardware sampling rate, simple structure and easy integration and application. Drawings So that the manner in which the above recited embodiments of the present invention and the manner in which the same are attained and can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings, which drawings are intended to be illustrative, and which drawings, however, are not to be construed as limiting the invention in any way, and in which other drawings may be obtained by those skilled in the art without the benefit of the appended claims. FIG. 1 shows a broad spectrum ASE light source used in the present invention. Fig. 2 is a diagram of an ultra wideband signal detection s