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Related Experiment Video

Updated: May 3, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Frequency resolved optical gating characterization of sub-ps pulses from single-section InAs/InP quantum dash based

C Calò, H Schmeckebier, K Merghem

    Optics Express
    |February 12, 2014
    PubMed
    Summary

    Researchers achieved self-starting mode-locking in quantum dash lasers, generating ultrashort optical pulses down to 374 fs. External chirp compensation and pulse compression were investigated for advanced laser characterization.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Quantum Dash Technology

    Background:

    • Fabry-Pérot lasers based on Indium Arsenide/Indium Phosphide (InAs/InP) quantum dashes are crucial for optical communications.
    • Achieving stable, ultrashort pulse generation is essential for high-speed data transmission.

    Purpose of the Study:

    • To investigate and optimize mode-locking in single-section InAs/InP quantum dash lasers operating at 1.56 µm.
    • To characterize the generated ultrashort optical pulses and their dependence on external parameters.

    Main Methods:

    • Utilizing second-harmonic generation frequency resolved optical gating (SHG-FROG) for pulse characterization.
    • Employing external chirp compensation with standard single-mode fiber (SMF-28).
    • Investigating pulse compression and pulse shape variations with different SMF-28 lengths and bias conditions.

    Main Results:

    • Demonstrated self-starting mode-locking with pulse widths as short as 374 femtoseconds (fs).
    • Successfully compressed optical pulses through standard single-mode fiber.
    • Observed dependence of pulse shape and phase on laser bias conditions.

    Conclusions:

    • External chirp compensation is effective for achieving ultrashort pulses from quantum dash lasers.
    • The study provides insights into pulse compression and characterization techniques for semiconductor lasers.
    • Results are consistent with advanced pulse characterization methods like the stepped-heterodyne technique.