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400-Gb/s direct modulation using a DFB+R laser.

Di Che, Yasuhiro Matsui, Xi Chen

    Optics Letters
    |June 16, 2020
    PubMed
    Summary
    This summary is machine-generated.

    We developed a direct-modulation system achieving a 411.6 Gb/s line rate using a 65 GHz distributed feedback with a reflective laser. This O-band laser enables dispersion-tolerant data transmission up to 15 km without optical amplification.

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    Area of Science:

    • Optoelectronics
    • Optical Communications
    • Laser Technology

    Background:

    • High-speed optical communication systems are crucial for meeting increasing data demands.
    • Direct modulation and detection offer simpler and potentially lower-cost solutions compared to coherent systems.
    • Dispersion management remains a key challenge in optical fiber transmission.

    Purpose of the Study:

    • To demonstrate a high-speed direct-modulation and direct-detection optical communication system.
    • To evaluate the performance of a 65 GHz distributed feedback with a reflective (DFB+R) laser in such a system.
    • To assess the system's capability for dispersion-tolerant transmission.

    Main Methods:

    • Utilized a 65 GHz DFB+R laser for direct modulation.
    • Implemented a direct-detection scheme for signal recovery.
    • Conducted back-to-back transmission tests to measure line and net bit rates.
    • Performed transmission experiments up to 15 km to evaluate dispersion tolerance.

    Main Results:

    • Achieved a back-to-back line rate of 411.6 Gb/s (net bit rate of 337.5 Gb/s).
    • The O-band laser with a chirp parameter of 0.6 demonstrated effective dispersion tolerance.
    • Successful transmission over 15 km was achieved without the need for an optical amplifier.

    Conclusions:

    • The direct-modulation and direct-detection system using a 65 GHz DFB+R laser is a viable approach for high-speed optical communication.
    • The O-band laser's characteristics facilitate dispersion-tolerant links, simplifying network infrastructure.
    • This technology offers a promising solution for short-reach, high-capacity optical networks.