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Ultra-compact coherent receiver with serial interface for pluggable transceiver.

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    This study introduces an ultra-compact integrated coherent receiver, utilizing a quad-channel transimpedance amplifier (TIA)-IC chip with a serial peripheral interface (SPI). The novel design achieves performance comparable to larger systems without bit-error rate degradation from SPI access.

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    Area of Science:

    • Photonics and Optical Communications
    • Integrated Circuit Design
    • High-Speed Data Transmission

    Background:

    • Traditional integrated coherent receivers are often bulky, limiting their application in next-generation pluggable transceivers.
    • Miniaturization is a key challenge in developing advanced optical communication systems.

    Purpose of the Study:

    • To demonstrate a novel, ultra-compact integrated coherent receiver.
    • To evaluate the performance and reliability of the compact receiver, particularly concerning the serial peripheral interface (SPI).

    Main Methods:

    • Integration of a quad-channel transimpedance amplifier (TIA)-IC chip with SPI, a miniature dual polarization optical hybrid, and an octal-photodiode (PD) array.
    • Utilizing a small optical coupling system for miniaturization.
    • Performance testing using a 32 Gbaud dual-polarization quadrature phase shift keying signal.

    Main Results:

    • Achieved an ultra-compact receiver volume of 1.3 cc.
    • Demonstrated transmission performance equivalent to conventional integrated coherent receivers.
    • Confirmed no bit-error rate (BER) degradation due to continuous SPI interface access.

    Conclusions:

    • The developed ultra-compact receiver offers a viable solution for next-generation pluggable transceivers.
    • The integration of TIA-IC with SPI and other compact components enables high-performance miniaturization.
    • The SPI interface is reliable and does not compromise receiver performance.