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Related Concept Videos

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...
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...
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal centroidal axes. The...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.

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Related Experiment Video

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Waveguide-bend configuration with low-loss characteristics.

T Shiina, K Shiraishi, S Kawakami

    Optics Letters
    |September 10, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel structure significantly reduces bending losses in dielectric optical waveguides. By incorporating a low refractive-index region, it accelerates the phase front, enhancing performance and minimizing signal loss.

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    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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    Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
    12:18

    Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

    Published on: August 5, 2013

    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Dielectric optical waveguides are crucial for transmitting light signals.
    • Abrupt bends in waveguides often lead to significant signal loss.
    • Minimizing bending losses is essential for efficient optical communication systems.

    Purpose of the Study:

    • To propose and experimentally validate a novel structure for reducing abrupt-bend losses in dielectric optical waveguides.
    • To investigate the effect of a low refractive-index region on phase-front acceleration and loss reduction.

    Main Methods:

    • Design of a waveguide structure featuring a low refractive-index region at the outer corner of bends.
    • Experimental characterization of the bending loss in the proposed structure compared to conventional designs.
    • Analysis of the phase-front acceleration mechanism within the modified waveguide geometry.

    Main Results:

    • The proposed structure demonstrates a significant reduction in bending loss compared to conventional waveguide bends.
    • The low refractive-index region effectively acts as a phase-front accelerator for the propagating optical mode.
    • Experimental data confirms the substantial decrease in signal attenuation at abrupt bends.

    Conclusions:

    • The developed structure offers an effective solution for mitigating abrupt-bend losses in dielectric optical waveguides.
    • Phase-front acceleration via a low refractive-index region is a viable strategy for improving waveguide performance.
    • This advancement has implications for designing more efficient and robust optical integrated circuits.