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Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the system's...
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...
Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Downstream Processing01:29

Downstream Processing

Downstream processing begins once fermentation is complete and involves a series of steps to recover and purify products such as acids, vitamins, antibiotics, or proteins.Cell HarvestingFor example, for intracellular protein-based products, the first step is harvesting the cells. This is typically achieved using centrifugation or filtration to separate the cells from the liquid phase.Cell Disruption for Intracellular ProductsIf the target product is intracellular, the harvested cells must be...
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:
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...

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Related Experiment Video

Updated: May 29, 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

Wavelength remodulation scheme using DPSK downstream and upstream for DWDM-PONs.

Nebras Deb1, Hanan Anis

  • 1School of Information Technology and Engineering (SITE), University of Ottawa, K1N 6N5, Canada. ndeeb070@uottawa.ca

Optics Express
|September 22, 2011
PubMed
Summary

This study introduces a new wavelength-division-multiplexed passive optical network (WDM-PON) architecture. The novel design enhances chromatic dispersion tolerance for improved optical network performance.

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Last Updated: May 29, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Area of Science:

  • Optical Networking
  • Telecommunications Engineering
  • Photonics

Background:

  • Chromatic dispersion poses a significant challenge in high-speed optical networks, limiting transmission distance.
  • Existing wavelength-division-multiplexed passive optical network (WDM-PON) architectures often require complex dispersion compensation mechanisms.

Purpose of the Study:

  • To propose and experimentally validate a novel WDM-PON architecture with enhanced tolerance to chromatic dispersion.
  • To enable error-free data transmission over extended fiber lengths without active dispersion compensation.

Main Methods:

  • A novel WDM-PON architecture utilizing differential phase-shift keying (DPSK) modulated downstream signals.
  • Remodulation of the downstream signal at the optical network unit (ONU) with a return-to-zero (RZ-DPSK) format.
  • Employing a pulse carver at the ONU for downstream data removal and upstream signal generation.
  • Experimental demonstration using both balanced and single-ended detection schemes.

Main Results:

  • Successful implementation of the proposed WDM-PON architecture at 2.5 Gb/s.
  • Achieved error-free operation over a 20 Km single-mode fiber link.
  • Demonstrated enhanced tolerance to chromatic dispersion without the need for external compensation.

Conclusions:

  • The proposed WDM-PON architecture offers a cost-effective and efficient solution for high-speed optical communication.
  • The novel remodulation technique at the ONU simplifies network design and improves performance.
  • This approach presents a viable alternative for future passive optical network deployments.