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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...
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:
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...
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.
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

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

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Published on: November 30, 2012

Low-loss LiNbO(3)waveguide bends with coherent coupling.

L M Johnson, F J Leonberger

    Optics Letters
    |August 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers minimized bending losses in single-mode titanium-indium-niobium oxide (Ti:LiNbO3) channel waveguides. Coherent coupling between closely spaced bends significantly reduced signal loss, achieving 0.08 dB per bend.

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    Published on: August 5, 2013

    Area of Science:

    • Optoelectronics
    • Materials Science
    • Photonics

    Background:

    • Titanium-indium-niobium oxide (Ti:LiNbO3) channel waveguides are crucial components in integrated optics.
    • Minimizing signal loss, particularly from bends, is essential for device performance.
    • Abrupt bends in waveguides typically introduce significant optical losses.

    Purpose of the Study:

    • To investigate methods for reducing bending losses in single-mode Ti:LiNbO3 channel waveguides.
    • To explore the effectiveness of coherent coupling effects in mitigating losses.
    • To evaluate various multiple-bend structures for optimal performance.

    Main Methods:

    • Fabrication of single-mode Ti:LiNbO3 channel waveguides.
    • Introduction of closely spaced abrupt bends in various configurations.
    • Measurement of optical losses using precise instrumentation.
    • Comparison of losses in coupled multiple-bend structures versus isolated bends.

    Main Results:

    • Achieved significantly low bending losses in Ti:LiNbO3 waveguides.
    • Demonstrated the efficacy of coherent coupling between closely spaced bends.
    • Quantified losses as low as 0.08 dB per coupled 1-degree abrupt bend.
    • Observed a tenfold reduction in loss compared to isolated bends (0.8 dB per bend).

    Conclusions:

    • Coherent coupling in closely spaced abrupt bends is an effective strategy for minimizing signal loss in Ti:LiNbO3 waveguides.
    • Multiple-bend structures offer a viable solution for high-performance integrated optical devices.
    • This technique paves the way for more efficient and compact photonic integrated circuits.