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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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All-optical central-frequency-programmable and bandwidth-tailorable radar.

Weiwen Zou1,2, Hao Zhang1, Xin Long1

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This study presents a novel all-optical radar system. It offers programmable frequencies and bandwidth agility, enabling advanced radar capabilities for diverse applications.

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Area of Science:

  • Photonics and Radar Systems
  • Microwave Photonics Applications
  • Radio-Frequency Engineering

Background:

  • Modern radar systems require multi-band reconfigurability, programmable frequencies, and bandwidth agility.
  • Traditional radar architectures face limitations in meeting these advanced requirements.
  • Microwave photonics offers a promising solution for enhanced radar capabilities.

Purpose of the Study:

  • To demonstrate an all-optical radar architecture with central-frequency programmability and bandwidth tailoring.
  • To utilize a single mode-locked laser for both signal generation and reception in a coherent system.
  • To achieve ultra-high-range resolution through innovative signal processing techniques.

Main Methods:

  • Generating a wideband linearly chirped radar signal via heterodyning of filtered, pre-chirped optical pulses.
  • Employing wavelength-to-time mapping for optical pulse pre-chirping.
  • Modulating radar echoes onto a shared optical pulse for signal generation and reception.
  • Utilizing the time-stretch principle for signal stretching or compression to facilitate digitization.

Main Results:

  • Demonstration of an all-optical radar architecture with flexible band tailoring and user-defined carrier frequencies.
  • Successful implementation of a coherent system using one mode-locked laser for signal generation and reception.
  • Facilitation of digitization without loss of detection ability through time-stretch processing.
  • Achieved ultra-high-range resolution radar signal generation and processing.

Conclusions:

  • The developed all-optical radar architecture offers unprecedented flexibility in frequency and bandwidth.
  • This photonics-assisted approach enables advanced radar functionalities for military, security, and rescue applications.
  • The system's ability to achieve ultra-high-range resolution marks a significant innovation in radar technology.