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Related Experiment Video

Updated: Aug 26, 2025

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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30 Gbit/s PAM4 transmission using an 8-GHz directly modulated multi-section laser.

Marcos Troncoso Costas, Ahmed Galib Reza, Hima Putta

    Optics Express
    |October 13, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a new laser for optical networks. It achieves high-speed data transmission over long fiber distances with reduced chirp, making it ideal for advanced communication systems.

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    Area of Science:

    • Photonics and Optical Communications
    • Semiconductor Lasers
    • Fiber Optic Networks

    Background:

    • Directly modulated lasers are crucial for optical communication systems.
    • Achieving high data rates over extended fiber links requires lasers with low noise and chirp.
    • Master-slave laser configurations offer potential for improved performance.

    Purpose of the Study:

    • To characterize a novel directly modulated multi-section laser with a master-slave configuration.
    • To evaluate the laser's performance for optical access network applications.
    • To demonstrate the laser's capability for high-speed data transmission.

    Main Methods:

    • Characterization of amplitude and phase noise.
    • Measurement of relative intensity noise (RIN) and 3-dB linewidth.
    • Demonstration of data transmission using Pulse Amplitude Modulation (PAM4 and PAM8).
    • Testing transmission over various single-mode fiber lengths (25 km, 50 km, 75 km).

    Main Results:

    • Relative intensity noise (RIN) around -150 dB/Hz.
    • 3-dB linewidth of approximately 3 MHz.
    • Successful unamplified 30 Gbit/s C-band transmission over 25 km and 50 km using PAM4.
    • Successful amplified 30 Gbit/s PAM4 and PAM8 transmission over 75 km.
    • Chirp reduction achieved through external injection locking.

    Conclusions:

    • The novel laser demonstrates excellent noise and linewidth performance.
    • External injection locking effectively reduces chirp, enhancing transmission capabilities.
    • The laser is suitable for high-speed optical access networks, supporting 30 Gbit/s transmission over 75 km.