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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
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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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Updated: Jul 10, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Time-multiplexed photonically enabled radio-frequency arbitrary waveform generation with 100 ps transitions.

Chen-Bin Huang1, Daniel E Leaird, Andrew M Weiner

  • 1School of Electrical and Computer Engineering, Purdue University, 465 Northwestern Avenue, West Lafayette, Indiana 47907-2035, USA. robinh@purdue.edu

Optics Letters
|November 21, 2007
PubMed
Summary

Researchers demonstrate time-multiplexing of radio-frequency arbitrary waveforms within 100 picoseconds. This novel method integrates wavelength switching, optical frequency comb generation, and spectral shaping for faster transitions.

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Last Updated: Jul 10, 2026

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Area of Science:

  • Photonics and Optical Communications
  • Signal Processing

Background:

  • Arbitrary waveform generation is crucial for advanced communication systems.
  • Existing methods face limitations in speed and flexibility for radio-frequency (RF) signal generation.

Purpose of the Study:

  • To demonstrate a novel time-multiplexing scheme for RF arbitrary waveforms.
  • To achieve picosecond-level temporal resolution in waveform generation.
  • To integrate multiple optical techniques for enhanced waveform control.

Main Methods:

  • Integration of wavelength switching and optical frequency comb generation.
  • Application of spectral line-by-line shaping for precise waveform control.
  • Demonstration of time-multiplexing of RF arbitrary waveforms within 100 picoseconds.

Main Results:

  • Successful time-multiplexing of RF arbitrary waveforms at a 100 ps resolution.
  • Demonstration of a flexible and integrated optical approach.
  • Validation of the scheme's potential for rapid waveform transitions.

Conclusions:

  • The developed time-multiplexing scheme offers unprecedented speed and control for RF arbitrary waveforms.
  • This technique is extensible to diverse user specifications and faster transition times.
  • Represents a significant advancement in optical signal generation for communications.