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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

471
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
471

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Stable fiber-optic time transfer by active radio frequency phase locking.

Feifei Yin, Zhongle Wu, Yitang Dai

    Optics Letters
    |July 1, 2014
    PubMed
    Summary

    This study presents a new fiber optic technology for stable time signal transfer. It uses active radio frequency (RF) stabilization to achieve precise time and frequency delivery over long distances.

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    Area of Science:

    • Optical Physics
    • Metrology
    • Telecommunications Engineering

    Background:

    • Accurate time and frequency transfer are critical for modern scientific and technological applications.
    • Existing methods face challenges in maintaining stability over long-distance fiber optic links.
    • Dynamic compensation of link delay variations is essential for high-precision signal transfer.

    Purpose of the Study:

    • To demonstrate a fiber link for stable time signal transfer using active long-distance radio frequency (RF) stabilization.
    • To achieve simultaneous stable time and frequency transfer over optical fiber.
    • To dynamically compensate for link delay variations in optical fiber.

    Main Methods:

    • Utilizing active long-distance radio frequency (RF) stabilization technology.
    • Leveraging chromatic dispersion in optical fiber to dynamically compensate link delay.
    • Tuning optical carrier wavelength to phase lock a round-trip RF reference.
    • Carrying time signal and RF reference on the same optical carrier.

    Main Results:

    • Demonstrated stable time signal transfer over a 50-km fiber link.
    • Achieved a time deviation of 40 ps at 1-s average and 2.3 ps at 1000-s average.
    • RF reference delivery showed an Allan deviation of 2×10(-15) at 1000-s average.

    Conclusions:

    • The proposed fiber link enables highly stable time transfer by synchronizing time signals and RF references.
    • The active RF stabilization technology effectively compensates for dynamic link delay variations.
    • Simultaneous stable time and frequency transfer is achievable with this method, paving the way for enhanced metrology applications.