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Optical short-pulse generation using diode lasers with negative optoelectronic feedback.

C H Lee, S Y Shin, S Y Lee

    Optics Letters
    |September 12, 2009
    PubMed
    Summary
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    Researchers developed a novel optical short-pulse generation technique using diode lasers and negative optoelectronic feedback. This method achieves picosecond pulses at gigahertz rates without external modulation or critical alignment.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Electronic Engineering

    Background:

    • Generating high-repetition-rate optical short pulses is crucial for applications in telecommunications and scientific research.
    • Existing methods often require complex setups, external modulation, or precise optical alignment, limiting their practicality.

    Purpose of the Study:

    • To propose and theoretically analyze a new method for generating optical short pulses.
    • To demonstrate the feasibility of using stable diode lasers with negative optoelectronic feedback for pulse generation.
    • To achieve high repetition rates and short pulse widths without complex external components.

    Main Methods:

    • Utilizing stable diode lasers as the gain medium.
    • Implementing a negative optoelectronic feedback loop.

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  • Calculating the required gain-bandwidth product for the feedback network.

    • Main Results:

    • Theoretical prediction of optical pulse generation with repetition rates in the gigahertz range.
    • Calculated pulse widths on the order of a picosecond.
    • Determination of a required gain-bandwidth product of a few tens of gigahertz for the feedback network.

    Conclusions:

    • The proposed method offers a robust and simplified approach to optical short-pulse generation.
    • The technique is independent of external modulation signals, enhancing its stability.
    • The method is not susceptible to critical optical alignment, making it practical for implementation.