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Simple optoelectronic frequency-offset estimator for coherent optical OFDM.

Jokhakar Jignesh, Bill Corcoran, Chen Zhu

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    |December 17, 2017
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    Summary

    We developed a novel carrier frequency-offset estimator for optical Orthogonal Frequency Division Multiplexing (OFDM) systems. This method uses readily available optical components and basic digital processing, simplifying complex digital signal processing for accurate offset estimation.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Photonics

    Background:

    • Optical Orthogonal Frequency Division Multiplexing (OFDM) systems are crucial for high-speed data transmission.
    • Accurate carrier frequency offset estimation is essential for maintaining signal integrity in optical OFDM.
    • Traditional digital signal processing methods can be computationally intensive.

    Purpose of the Study:

    • To propose a new carrier frequency-offset estimator for optical OFDM systems.
    • To replace complex digital signal processing with a simpler approach using off-the-shelf optical components.
    • To evaluate the performance and accuracy of the proposed estimator.

    Main Methods:

    • Utilized off-the-shelf optical components for signal processing.
    • Employed simple digital processing techniques.
    • Simulated a single polarization 28-Gbaud OFDM signal with a 15% cyclic prefix.
    • Investigated the impact of system parameters on estimator performance.

    Main Results:

    • Achieved an accuracy of less than 4% estimate error.
    • The estimator operates effectively within a frequency offset range of [-1250, +1250] MHz.
    • Demonstrated the feasibility of the proposed hybrid optical-digital approach.

    Conclusions:

    • The proposed carrier frequency-offset estimator offers a practical and accurate solution for optical OFDM systems.
    • This method reduces reliance on purely digital signal processing, potentially lowering hardware complexity and cost.
    • The findings provide a foundation for developing more efficient optical communication systems.