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Related Concept Videos

Lossless Lines01:23

Lossless Lines

585
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...
585
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

439
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...
439

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Low-loss reciprocal optical terminals for two-way time-frequency transfer.

W C Swann, L C Sinclair, I Khader

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    Summary

    We developed a low-cost free-space optical terminal for precise time-frequency transfer. This compact system uses tip/tilt compensation to overcome atmospheric turbulence, enabling reliable data transmission.

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    Area of Science:

    • Optical physics and engineering
    • Atmospheric optics
    • Metrology and time-frequency transfer

    Background:

    • Accurate time-frequency transfer is crucial for scientific applications and communication networks.
    • Atmospheric turbulence poses a significant challenge for free-space optical communication links.
    • Existing solutions for free-space time-frequency transfer can be costly and complex.

    Purpose of the Study:

    • To design and evaluate a low-cost, compact free-space optical terminal.
    • To enable reliable optical two-way time-frequency transfer over turbulent atmospheric links.
    • To investigate the impact of atmospheric turbulence on pointing control and terminal design.

    Main Methods:

    • Development of a reciprocal free-space terminal with tip/tilt pointing compensation.
    • Characterization of terminal insertion loss (∼1.5 dB).
    • Performance evaluation across horizontal, 2-km, 4-km, and 12-km turbulent links with varying losses (15 dB, 24 dB, 50 dB).

    Main Results:

    • The terminal successfully demonstrated optical two-way time-frequency transfer.
    • Insertion losses were minimal, indicating efficient optical signal transmission.
    • Link losses varied significantly with distance and atmospheric conditions, highlighting the impact of turbulence.

    Conclusions:

    • The developed low-cost terminal effectively compensates for atmospheric turbulence.
    • Tip/tilt pointing control is essential for maintaining link stability and enabling accurate time-frequency transfer.
    • The study provides valuable insights into free-space optical terminal design for robust atmospheric communication.