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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...
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.
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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...
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
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Waveguide propagation-loss measurement technique.

R Arsenault, D Gregoris, S Woolven

    Optics Letters
    |September 11, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A new nondestructive method precisely measures waveguide propagation loss by analyzing reflected and transmitted light. This technique simplifies loss measurement in optical devices, improving accuracy without needing input coupling efficiency data.

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    Area of Science:

    • Optoelectronics
    • Photonics
    • Materials Science

    Background:

    • Accurate measurement of propagation loss is crucial for optimizing optical devices.
    • Existing methods for measuring waveguide loss can be complex and sensitive to input coupling efficiency.
    • Nondestructive techniques are highly desirable for characterizing integrated optical components.

    Purpose of the Study:

    • To demonstrate a novel, nondestructive technique for measuring propagation loss in single-mode waveguides.
    • To develop a method that is independent of input coupling efficiency.
    • To enhance the ease and precision of propagation loss measurements.

    Main Methods:

    • The technique calculates the total propagation-loss coefficient.
    • It utilizes the ratio of retroreflected and transmitted light from the waveguide.
    • A surface-wave transducer acts as an acousto-optic modulator within a lock-in detection scheme.

    Main Results:

    • The demonstrated method provides a nondestructive measurement of propagation loss.
    • The technique's accuracy is independent of the input light coupling efficiency.
    • The use of a surface-wave transducer and lock-in scheme enhances measurement precision and ease.

    Conclusions:

    • This novel technique offers a robust and simplified approach to measuring waveguide propagation loss.
    • The method's independence from coupling efficiency makes it highly practical for various waveguide applications.
    • The acousto-optic modulation and lock-in detection contribute to improved measurement performance.