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Efficient 330-Gb/s PAM-8 modulation using silicon microring modulators.

David W U Chan, Xiong Wu, Chao Lu

    Optics Letters
    |February 15, 2023
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    We developed a silicon microring modulator for optical communication exceeding 300 Gb/s. This high-efficiency device uses PAM-8 modulation, proving superior to PAM-4 for high-speed, short-reach systems.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Integrated Optics

    Background:

    • Next-generation optical transmitters require higher data rates exceeding 300 Gb/s.
    • Existing modulators face challenges in achieving high baud rates and energy efficiency.

    Purpose of the Study:

    • To propose and demonstrate a high-efficiency silicon microring modulator.
    • To evaluate its performance for line rates above 300 Gb/s using advanced modulation formats.

    Main Methods:

    • Fabrication of a silicon microring modulator.
    • Testing with high-order Pulse Amplitude Modulation (PAM-8) up to 110 Gbaud (330 Gb/s).
    • Comparison with ultrahigh baud rate PAM-4 (up to 130 Gbaud).

    Main Results:

    • Demonstrated a silicon microring modulator supporting PAM-8 at 110 Gbaud (330 Gb/s) with a low driving voltage of 1.8 Vpp.
    • Achieved a dynamic energy consumption of 3.1 fJ/bit.
    • Showcased PAM-8's suitability over PAM-4 for 300 Gb/s lane rates in bandwidth-limited scenarios.

    Conclusions:

    • The developed silicon microring modulator is a promising candidate for future optical transmitters.
    • PAM-8 modulation is advantageous for achieving high data rates in bandwidth-constrained short-reach optical systems.