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Bias-dependent distortion in optical comb-based analog optical links.

Jason D McKinney, Vincent J Urick, Alexander S Hastings

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    Summary

    Optimizing bias frequency significantly improves second-order distortion in analog optical links by over 48 dB. Average optical comb frequency measurement can determine optimal bias frequency, simplifying performance tuning.

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    Area of Science:

    • Photonics
    • Electrical Engineering
    • Signal Processing

    Background:

    • Second-order distortion is a critical performance limitation in analog optical links.
    • Optimizing bias frequency is crucial for mitigating distortion but traditionally requires complex measurements.

    Purpose of the Study:

    • To experimentally demonstrate the effect of bias frequency on second-order distortion in sampled analog optical links.
    • To establish a simplified method for determining the optimal bias frequency.

    Main Methods:

    • Experimental characterization of second-order distortion in analog optical links under varying bias frequencies.
    • Analysis of optical comb spectra to correlate average frequency with distortion performance.

    Main Results:

    • A >48 dB improvement in second-order distortion was achieved through proper bias frequency selection.
    • Measurement of the average optical comb frequency accurately predicts the optimum bias frequency.

    Conclusions:

    • Bias frequency is a key parameter for controlling second-order distortion in analog optical links.
    • Average optical comb frequency measurement offers a practical and efficient method for optimizing bias frequency, eliminating the need for extensive RF distortion analysis.