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Related Concept Videos

Transmission Line Design Considerations01:23

Transmission Line Design Considerations

718
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...
718
Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

710
The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
710
Maximum Power Transfer01:16

Maximum Power Transfer

1.1K
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
1.1K
Reducing Line Loss01:18

Reducing Line Loss

444
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...
444
Transmission-Line Differential Equations01:26

Transmission-Line Differential Equations

1.1K
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured from...
1.1K
Equivalent Resistance01:16

Equivalent Resistance

1.2K
In circuit analysis, situations often arise where resistors are neither in series nor parallel configurations. To tackle such scenarios, three-terminal equivalent networks like the wye (Y) (Figure 1 (a)) or tee (T) and delta (Δ) (Figure 1 (b)) or pi (π) networks come into play. These networks offer versatile solutions and are frequently encountered in various applications, including three-phase electrical systems, electrical filters, and matching networks.
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Related Experiment Video

Updated: Mar 28, 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

10.4K

Cost-effective TCM-based WDM-PON for highly asymmetric traffic conditions.

Danbi Lee, Won-Bae Kwon, Chang-Joon Chae

    Optics Express
    |December 25, 2015
    PubMed
    Summary

    This study demonstrates a novel wavelength division multiplexing passive optical network (WDM-PON) using a reflective semiconductor optical amplifier (RSOA). The system achieves simultaneous upstream and downstream data transmission with improved downstream signal sensitivity.

    Related Experiment Videos

    Last Updated: Mar 28, 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

    10.4K

    Area of Science:

    • Optical Networking
    • Telecommunications Engineering
    • Photonics

    Background:

    • Passive optical networks (PONs) are crucial for broadband access.
    • Wavelength division multiplexing (WDM) enhances PON capacity.
    • Reflective Semiconductor Optical Amplifiers (RSOAs) offer potential for cost-effective optical network components.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel WDM-PON architecture.
    • To investigate the use of RSOA for simultaneous upstream and downstream signal processing.
    • To evaluate the performance of the proposed system in terms of signal sensitivity and power penalty.

    Main Methods:

    • Implementation of a WDM-PON system utilizing Time Compression Multiplexing (TCM).
    • Integration of a Reflective Semiconductor Optical Amplifier (RSOA) for signal amplification and modulation.
    • Experimental setup to transmit and receive 10 Gb/s downstream and 1.25 Gb/s upstream signals over 20 km.
    • Bit error rate (BER) measurements to assess system performance.

    Main Results:

    • The RSOA successfully pre-amplified the 10 Gb/s downstream signal, improving sensitivity by approximately 3 dB.
    • The RSOA modulated the downstream wavelength-locked signal with the 1.25 Gb/s upstream signal simultaneously.
    • Achieved low power penalties of ~0.1 dB for downstream and ~1.1 dB for upstream signals at a BER of 10(-9) after 20 km transmission.

    Conclusions:

    • The proposed TCM-based WDM-PON using RSOA is feasible and effective.
    • The RSOA integration enhances downstream signal performance and enables simultaneous bidirectional transmission.
    • This architecture offers a promising solution for high-capacity, cost-effective optical access networks.