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Related Concept Videos

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

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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...
330

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Phase-stabilized all-fiber-based mode-filtering technique for generating a gigahertz frequency comb.

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    A new all-fiber technique generates a gigahertz-repetition-rate fiber frequency comb. This method achieves high side-mode suppression and stable cavity length for advanced applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Laser Physics

    Background:

    • Fiber-based frequency combs are crucial for precision measurements.
    • Generating high-repetition-rate combs with high spectral purity remains a challenge.

    Purpose of the Study:

    • To develop an all-fiber mode-filtering technique for gigahertz-repetition-rate fiber frequency combs.
    • To enhance the side-mode suppression ratio and stabilize the cavity length.

    Main Methods:

    • Utilized an all-fiber mode-filtering approach.
    • Incorporated a thermally diffused expanded core fiber to minimize splice loss.
    • Applied the Pound-Drever-Hall stabilization technique for resonance frequency locking.

    Main Results:

    • Successfully generated a gigahertz-repetition-rate fiber frequency comb with a multiplication factor of 21.
    • Achieved a high side-mode suppression ratio of approximately 65 dB.
    • Demonstrated stabilized fiber cavity length locked to the comb mode.

    Conclusions:

    • The developed all-fiber mode-filtering technique offers a robust method for generating high-repetition-rate frequency combs.
    • The technique's high spectral purity and stability make it suitable for various demanding applications.
    • This advancement is expected to be valuable for applications requiring precise optical frequency standards.