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    This study introduces a new equalization method for directly modulated optical sources, improving data rates by dynamically adjusting to frequency-dependent linearity. This novel approach enhances optical transmitter performance and transmitted signal energy.

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    Area of Science:

    • Optoelectronics
    • Optical Communications
    • Signal Processing

    Background:

    • Conventional equalization methods for optical sources assume a fixed linear dynamic range.
    • These methods often limit performance by attenuating low-frequency components to ensure a flat frequency response.
    • The dynamic range of optical sources is known to vary with signal frequency.

    Purpose of the Study:

    • To introduce a novel equalization method for directly modulated optical sources.
    • To address the frequency-dependent nature of source dynamic range.
    • To enhance optical source bandwidth and transmitted signal energy.

    Main Methods:

    • A new method was developed to determine the signal linearity limit at each frequency.
    • The equalizer response was enhanced based on these frequency-specific linearity limits.
    • The method was experimentally validated using a resonant-cavity LED transmitter.

    Main Results:

    • The novel equalization method significantly improves source bandwidth.
    • Experimental results demonstrated a data-rate improvement of approximately 40%.
    • A record data rate of 8.76 Gb/s was achieved with a bit-error rate below 3.8×10-3.

    Conclusions:

    • The proposed frequency-dependent equalization method overcomes limitations of conventional approaches.
    • This technique enables greater transmitted signal energy and higher data rates for optical transmitters.
    • The findings represent a significant advancement in optical communication technology.