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10×10  Gbs directly modulated DFB laser array based on the REC technique.

Wei Yuan, Jie Zhao, Yaguang Wang

    Applied Optics
    |September 14, 2023
    PubMed
    Summary
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    We developed a 100 Gbps distributed feedback laser array using the reconstruction equivalent chirp technique. This technology offers precise wavelength spacing for cost-effective DWDM communication systems.

    Area of Science:

    • Photonics and Optical Communications
    • Semiconductor Lasers

    Background:

    • High-speed optical communication systems require advanced laser sources.
    • Distributed Feedback (DFB) lasers are crucial components in wavelength-division multiplexing (WDM) systems.

    Purpose of the Study:

    • To propose and experimentally demonstrate a directly modulated DFB laser array.
    • To achieve a total transmission rate of 100 Gbps (10 channels × 10 Gbps).
    • To ensure precise channel spacing compliant with the ITU-DWDM standard.

    Main Methods:

    • Utilized the reconstruction equivalent chirp (REC) technique for grating design.
    • Directly modulated the DFB laser array with a 10 Gbps nonreturn-to-zero signal.
    • Transmitted the signal over a 10 km single-mode fiber link.

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    Main Results:

    • Demonstrated a 100 Gbps transmission rate with 10 channels × 10 Gbps.
    • Achieved precise channel wavelength spacing of 100 GHz using the REC technique.
    • Exhibited excellent laser consistency: side-mode suppression ratio > 48 dB, threshold current ~20 mA, modulation bandwidth > 13 GHz.

    Conclusions:

    • The proposed DFB laser array shows high performance and consistency.
    • The REC technique enables accurate channel spacing for DWDM systems.
    • This laser array is a promising candidate for future low-cost, 100 Gbps DWDM communication systems.