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Optical signal acquisition using an alignment robust receiver based on a photodetector array.

Yunjie Yan, Joris Van Kerrebrouck, Nishant Singh

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    |December 1, 2025
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    Summary
    This summary is machine-generated.

    This study presents a high-speed receiver module for free-space optical communications, achieving 2.7 GHz bandwidth and reliable 10 Gbps data transmission. It offers robust alignment for improved optical communication systems.

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    Area of Science:

    • Optical Communications
    • High-Speed Electronics
    • Photodetector Technology

    Background:

    • Free-space optical communication systems require high-speed receivers with robust alignment capabilities.
    • Previous photodetector arrays (PDAs) have limitations in modulation response and bandwidth.

    Purpose of the Study:

    • To present a high-speed receiver module for free-space optical communications.
    • To enhance modulation response and element bandwidth through PCB optimization.
    • To characterize the receiver's frequency response, transmission performance, and alignment tolerance.

    Main Methods:

    • Development and packaging of a receiver module incorporating a PDA.
    • Optimization of the printed circuit board (PCB) for improved performance.
    • Characterization of frequency response, transmission performance, and alignment tolerance.
    • Demonstration of data transmission over 25 km of single-mode fiber (SMF).

    Main Results:

    • Achieved an average 3 dB bandwidth of 2.7 GHz.
    • Demonstrated an alignment tolerance of 37 µm without mechanical beam tracking.
    • Significantly improved 3 dB, 6 dB, and 10 dB bandwidths compared to prior work.
    • Reliable operation at 10 Gbps (NRZ) for selected elements over 25 km SMF.
    • Achieved bit error rates (BERs) below 10-12 at 10 Gbps with transmitter equalization.

    Conclusions:

    • The optimized receiver module offers enhanced bandwidth and robust alignment for free-space optical communications.
    • The module reliably transmits data at high speeds, paving the way for improved optical communication systems.
    • Further improvements in BER were achieved through transmitter-side equalization, demonstrating system viability.