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Modelling two-laser asynchronous optical sampling using a single 2-section semiconductor mode-locked laser diode.

I Ejidike, R A McCracken, D Bajek

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    Summary

    Single laser asynchronous optical sampling (SLASOPS) offers a simpler, more affordable alternative to two-laser methods. This technique uses one laser for high-speed, high-resolution optical sampling with reduced complexity.

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    Area of Science:

    • Optics and Photonics
    • Ultrafast Laser Science

    Background:

    • Conventional asynchronous optical sampling (ASOPS) typically requires two synchronized lasers.
    • This dual-laser setup presents significant cost and technical challenges.

    Purpose of the Study:

    • To introduce and theoretically demonstrate single laser asynchronous optical sampling (SLASOPS).
    • To present SLASOPS as a viable, simplified alternative to existing ASOPS techniques.

    Main Methods:

    • Theoretical modeling of a single 2-section mode-locked laser diode setup.
    • Simulation of asynchronous optical sampling generation and detection.
    • Mathematical incorporation of timing jitter to analyze trace resolution.

    Main Results:

    • SLASOPS enables customizable scan ranges, rates, and resolutions by adjusting interferometer arm imbalance and laser repetition rate.
    • Analysis of optical cross-correlations between pulse pairs.
    • Demonstrated feasibility for megahertz scan rates and micron-level spatial precision.

    Conclusions:

    • SLASOPS significantly reduces cost and technical complexity by utilizing a single laser source.
    • The technique is suitable for various optical sampling applications requiring high speed and precision.