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Efficient DC-coupled linear 60-GBd EML-based O-band transmitter.

Kieran De Bruyn, Michael Theurer, Ye Gu

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    This study introduces an O-band transmitter using an electroabsorption modulated laser and SiGe BiCMOS driver. It achieves high-speed data transmission, demonstrating potential for advanced communication links.

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    Area of Science:

    • Optoelectronics
    • Integrated Circuit Design
    • Telecommunications

    Background:

    • O-band transmitters are critical components for current and future high-speed communication systems.
    • Electroabsorption modulated lasers (EMLs) and advanced driver integrated circuits (ICs) are essential for efficient signal modulation and transmission.

    Purpose of the Study:

    • To present a novel O-band transmitter design integrating an InGaAlAs multi-quantum well (MQW) EML with a 130 nm SiGe BiCMOS driver IC.
    • To analyze the co-design aspects, functionality, and architecture of the integrated components, focusing on the driver's performance characteristics.

    Main Methods:

    • Co-design of an InGaAlAs MQW EML and a 130 nm SiGe BiCMOS driver IC with a DC-coupled interface.
    • Characterization of the driver's immunity to EAM photocurrent and its wide bias voltage range capability.
    • Testing the transmitter's performance at various data rates and modulation formats (PAM4, NRZ, PAM8).

    Main Results:

    • The transmitter successfully transmitted 60 GBd PAM4 signals with an 8 dB extinction ratio at 4.3 pJ/bit power efficiency.
    • The system demonstrated capability for up to 80 GBd NRZ signal transmission.
    • High linearity allowed for 40 GBd PAM8 signal transmission.

    Conclusions:

    • The integrated O-band transmitter exhibits excellent performance, meeting the demands of high-speed optical communication.
    • The design showcases significant potential for diverse applications requiring efficient and high-capacity data transmission.
    • The co-designed EML and driver IC approach offers a robust solution for next-generation communication links.