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Related Concept Videos

Lossless Lines01:23

Lossless Lines

In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
Reducing Line Loss01:18

Reducing Line Loss

In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...

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Related Experiment Video

Updated: Jun 17, 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

A low bending loss multimode fiber transmission system.

Denis Donlagic1

  • 1University of Maribor, Faculty of Electrical Engineering and Computer Sciences, Maribor, Slovenia. ddonlagic@uni-mb.si

Optics Express
|December 10, 2009
PubMed
Summary

This study introduces a bend-resilient multimode optical fiber system. The new fiber exhibits minimal signal loss even when tightly coiled, ensuring compatibility with standard fiber optic networks.

Area of Science:

  • Optical Engineering
  • Materials Science
  • Telecommunications

Background:

  • Standard multimode optical fibers suffer significant signal loss when bent.
  • This limits their deployment in space-constrained environments.
  • Developing bend-tolerant fibers is crucial for next-generation networks.

Purpose of the Study:

  • To present a novel bend-tolerant multimode optical fiber.
  • To demonstrate its compatibility with existing 50 micrometer graded index multimode fiber infrastructure.
  • To quantify its performance under tight bending conditions.

Main Methods:

  • Fabrication of a bend-resistive multimode optical fiber.
  • Experimental testing of the fiber's bend loss performance when wrapped around a 1.5 mm radius cylinder.

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  • Integration of the bend-resistive fiber with standard 50 micrometer graded index multimode fiber and measurement of insertion loss.

    • Main Results:

    • Achieved bend losses below -0.2 dB for the proposed fiber when looped 10 times around a 1.5 mm radius cylinder.
    • Demonstrated total experimental measured loss below -0.15 dB when the bend-resistive fiber was inserted between standard multimode fiber sections.
    • Confirmed compatibility with standard 50 micrometer graded index multimode fiber in terms of bandwidth and interconnectivity.

    Conclusions:

    • The developed bend-tolerant multimode optical fiber offers a viable solution for reducing signal loss in constrained applications.
    • Its compatibility ensures seamless integration into existing fiber optic networks.
    • This technology supports the expansion of high-bandwidth optical communication systems.