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Related Concept Videos

Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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.
Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Related Experiment Video

Updated: Jul 3, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Frequency sixupler for millimeter-wave over fiber systems.

Mohmoud Mohamed1, Xiupu Zhang, Bouchaib Hraimel

  • 1Advanced Photonic Systems Laboratory, Department of Electrical & Computer Engineering, Concordia University, Montreal, Qc H3G1M8, Canada.

Optics Express
|July 9, 2008
PubMed
Summary

This study introduces a new millimeter-wave (mm-wave) frequency sixuplexing technique using two cascaded Mach-Zehnder modulators. The novel method enhances radio frequency (RF) power and receiver sensitivity for mm-wave signal generation.

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Area of Science:

  • Photonics and Optical Communications
  • Radio Frequency Engineering
  • Signal Processing

Background:

  • Millimeter-wave (mm-wave) frequencies are crucial for high-bandwidth communication systems.
  • Efficient generation of mm-wave signals with high power and sensitivity is a key challenge.
  • Existing techniques like optical carrier suppression modulation have limitations.

Purpose of the Study:

  • To propose and investigate a novel frequency sixuplexing technique for mm-wave generation.
  • To enhance radio frequency (RF) power and receiver sensitivity compared to conventional methods.
  • To demonstrate the robustness of the generated mm-wave signal against fiber chromatic dispersion.

Main Methods:

  • Utilizing two cascaded Mach-Zehnder modulators (MZMs).
  • The first MZM is biased for even-order optical harmonic generation.
  • The second MZM performs optical carrier suppression and data signal modulation.

Main Results:

  • Achieved an 8-dB higher RF power at 60 GHz.
  • Demonstrated a 6-dB improvement in receiver sensitivity.
  • The generated mm-wave signal exhibits robustness to fiber chromatic dispersion.

Conclusions:

  • The proposed cascaded MZM technique offers superior performance for mm-wave generation.
  • This method provides significant improvements in power and sensitivity.
  • Experimental verification confirms the technique's effectiveness and robustness.