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Updated: Sep 8, 2025

Quasi-light Storage for Optical Data Packets
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20 × 50 Gb/s electroabsorption-modulated DFB laser array based on the REC technique for data centers.

Zhenxing Sun, Wentao Sun, Ruleix Xiao

    Optics Express
    |August 13, 2025
    PubMed
    Summary

    We developed a 20-channel laser array for 1 Tb/s data center transmitters, ideal for AI systems. This compact, cost-effective chip offers high performance and integration for next-generation optical communications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Semiconductor Devices
    • Data Communication

    Background:

    • High-speed optical transmitters are crucial for data centers, especially for AI applications.
    • Existing solutions face challenges in cost, size, and integration for terabit-per-second data rates.

    Purpose of the Study:

    • To present and demonstrate a novel 20-channel electroabsorption-modulated distributed feedback laser (EML) array.
    • To provide a compact, cost-effective, single-chip solution for 1 Tb/s optical transmitters.

    Main Methods:

    • Monolithic integration of distributed feedback (DFB) lasers and electroabsorption modulators (EAM) using a shared InGaAlAs multiple-quantum-well (MQW) active layer.
    • Utilized the reconstruction equivalent chirp (REC) technique for simplified grating fabrication and precise wavelength control.

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  • Employed non-return-to-zero (NRZ) and pulse amplitude modulation (PAM4) for data transmission.

    • Main Results:

    • Achieved 20 distinct wavelengths spaced 100 GHz apart in the L-band with SMSR > 50 dB and wavelength deviation < 0.15 nm.
    • Demonstrated EAM bandwidth > 20 GHz, static extinction ratio > 19 dB, and output power of 13 mW.
    • Attained 25 Gb/s NRZ and 50 Gb/s PAM4 per-channel data rates, totaling over 1 Tb/s aggregate data rate.

    Conclusions:

    • The developed EML array offers a high-performance, integrated solution for next-generation data center optical communication systems.
    • The device's compact size, cost-effectiveness, and high data rate capabilities make it suitable for demanding AI applications.
    • This technology advances optical transmission capabilities, addressing the growing bandwidth requirements in high-performance computing environments.