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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
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...
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Cable Subjected to a Distributed Load

The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
Maximum Power Transfer01:16

Maximum Power Transfer

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Related Experiment Video

Updated: Jun 2, 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

Dynamic λ-OFDMA with selective multicast overlaid.

Xiangjun Xin1, Lijia Zhang, Bo Liu

  • 1School of Electronic Engineering, Beijing University of Posts and Telecommunications (BUPT), 10 XiTuCheng Road, Beijing, 100876, China.

Optics Express
|April 20, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a new dynamic wavelength-OFDMA network architecture. It successfully transmitted high-speed unicast and multicast signals over 25 km, demonstrating efficient wavelength assignment and control.

Related Experiment Videos

Last Updated: Jun 2, 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

Area of Science:

  • Optical Communications
  • Telecommunications Engineering
  • Network Architecture

Background:

  • Existing optical network architectures face challenges in dynamic wavelength allocation and efficient multicast services.
  • The integration of multiple modulation formats and data rates in a single network requires advanced architectural solutions.

Purpose of the Study:

  • To experimentally demonstrate a novel dynamic wavelength-OFDMA (Orthogonal Frequency Division Multiple Access) architecture.
  • To showcase the integration of selective differential phase shift keying (DPSK) overlay and a colorless optical network unit (ONU).
  • To validate dynamic wavelength assignment and multicast control mechanisms.

Main Methods:

  • Implementation of a dynamic wavelength assignment system using optical switches.
  • Integration of a selective DPSK overlay with 16QAM-OFDM (Quadrature Amplitude Modulation-Orthogonal Frequency Division Multiplexing) signals.
  • Utilizing an alternative local oscillator at the optical line terminal (OLT) for multicast control.

Main Results:

  • Successful transmission of a 10-Gb/s × 4-channel 16QAM-OFDM unicast signal.
  • Demonstrated overlay of a 2.5-Gb/s DPSK signal.
  • Achieved 1.25-Gb/s upstream signal transmission over a 25-km fiber link.
  • Validated dynamic wavelength assignment and multicast control functionalities.

Conclusions:

  • The proposed dynamic λ-OFDMA architecture effectively supports high-speed unicast and multicast services.
  • The system demonstrates flexibility in wavelength allocation and efficient signal transmission.
  • This architecture offers a promising solution for next-generation optical access networks.