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Updated: Jun 16, 2025

Quasi-light Storage for Optical Data Packets
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SOA-based optical burst power equalization for high-speed next generation passive optical networks.

Fariba Jamali, Stephen L Murphy, Cleitus Antony

    Optics Express
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    PubMed
    Summary

    Novel semiconductor optical amplifier (SOA) techniques equalize burst power in 100 Gb/s passive optical networks (PONs). This innovation extends dynamic range and simplifies receiver design, reducing the need for complex components in future high-speed optical networks.

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    Area of Science:

    • Optical Communications Engineering
    • Photonics
    • Network Infrastructure

    Background:

    • High-speed passive optical networks (PONs) require advanced modulation formats like 4-level pulse amplitude modulation (PAM4) for 100 Gb/s speeds.
    • Existing burst mode trans-impedance amplifiers (BM-TIAs) struggle with the dynamic range and bandwidth demands of high-speed PAM4 signals in PONs.
    • Semiconductor optical amplifiers (SOAs) are explored as receiver preamplifiers to manage signal-to-noise ratio and PON loss budgets.

    Purpose of the Study:

    • To introduce novel SOA-based optical domain burst power equalization techniques for simplified burst-mode receiver design.
    • To overcome the dynamic range and bandwidth limitations of conventional BM-TIAs in high-speed PON upstream transmissions.
    • To mitigate nonlinear SOA patterning effects in high-power burst transmissions.

    Main Methods:

    • Development and implementation of two SOA-based equalization techniques: variable bias and control light injection.
    • Experimental validation in a 100 Gb/s PAM4 system with a 29 dB PON loss budget.
    • Assessment of bit error rates (BER) against soft-decision forward error correction (SD-FEC) thresholds.

    Main Results:

    • Extended dynamic range to 24 dB, surpassing the 20.5 dB specified by the ITU-T 50G standard.
    • Maintained BER below the SD-FEC threshold, demonstrating robust signal integrity.
    • Reduced the necessity for high-gain BM-TIAs and complex digital signal processing (DSP).

    Conclusions:

    • SOA-based burst power equalization offers a cost-effective and scalable solution for future high-speed optical networks.
    • The proposed methods simplify receiver design by mitigating bandwidth limitations and enabling the use of linear equalization.
    • This approach enhances system performance and future-proofs PONs for increasing data rate demands.