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Updated: Dec 26, 2025

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Higher-order QAM data transmission using a high-coherence hybrid Si/III-V semiconductor laser.

Kaiheng Zou, Zhewei Zhang, Peicheng Liao

    Optics Letters
    |March 13, 2020
    PubMed
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    High-coherence hybrid silicon/III-V semiconductor lasers enable 20 Gbaud 16- and 64-quadrature amplitude modulation (QAM) data transmission over 80 km single-mode fiber links. These lasers achieve low bit error rates, crucial for advanced optical communication systems.

    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Optical Communications

    Background:

    • High-coherence lasers are essential for high-baud-rate optical data transmission.
    • Hybrid silicon/III-V semiconductor lasers offer potential for improved performance and integration.

    Purpose of the Study:

    • To experimentally demonstrate a hybrid silicon/III-V semiconductor laser for high-speed optical data transmission.
    • To evaluate the laser's performance in generating 20 Gbaud 16- and 64-quadrature amplitude modulated (QAM) signals over an 80 km single-mode fiber (SMF) link.

    Main Methods:

    • Utilized a hybrid silicon/III-V semiconductor laser with a Schawlow-Townes linewidth of ~10 kHz.
    • Transmitted 20 Gbaud 16-QAM and 64-QAM data signals over an 80 km SMF link.
    • Measured bit error rate (BER) with and without digital carrier phase recovery.

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    Main Results:

    • Achieved a BER of 4.1 × 10⁻³ for 64-QAM over 80 km SMF.
    • Achieved a BER < 1 × 10⁻⁴ for 16-QAM over 80 km SMF using Viterbi-Viterbi digital carrier phase recovery.
    • Demonstrated power penalties comparable to or slightly higher than external cavity lasers.

    Conclusions:

    • The hybrid Si/III-V laser is a viable light source for high-baud-rate optical transmitters.
    • The laser's coherence properties support reliable transmission of complex modulation formats over extended fiber links.
    • This technology shows promise for next-generation optical communication systems.