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Polarization-diversity Stokes-analyzer-based coherent receiver.

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    A simplified polarization-diversity coherent receiver reduces photodiode count from eight to six, cutting costs for short-reach networks. This novel design enables compact, low-cost coherent transceivers for optical communications.

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    Area of Science:

    • Optical Communications
    • Photonic Integrated Circuits

    Background:

    • Conventional coherent transceivers are expensive for short-reach networks due to complex receiver structures.
    • Simplifying receiver design is crucial for cost-effective deployment in applications like data centers.

    Purpose of the Study:

    • To propose and demonstrate a simplified polarization-diversity coherent receiver structure.
    • To reduce component count and complexity for low-cost coherent transceiver realization.

    Main Methods:

    • Exploited the concept of a Stokes analyzer for receiver simplification.
    • Reduced the number of photodiodes (PDs) from eight to six.
    • Utilized a single polarization beam splitter/combiner (PBS/C) for dual-polarization signals.

    Main Results:

    • Developed a proof-of-concept prototype using free-space optical components.
    • Successfully demonstrated transmission of 120-Gb/s dual-polarization quadrature phase-shift keying (DP-QPSK) and 8-ary quadrature-amplitude modulation (DP-8QAM) signals.
    • Achieved transmission over a 100-km single-mode fiber (SMF) link.

    Conclusions:

    • The proposed simple polarization-diversity coherent receiver architecture effectively reduces complexity and component count.
    • This architecture has the potential for monolithic integration on silicon-photonic or InP platforms.
    • Enables the realization of compact and low-cost coherent transceivers suitable for short-reach optical networks.