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Low-complexity algorithms for coherent optical systems with transceiver IQ imbalance.

Sameer Ahmad Mir, Lakshmi Narayanan Venkatasubramani, R David Koilpillai

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    Summary

    This study introduces a novel, pilot-free carrier phase recovery algorithm to correct in-phase/quadrature (IQ) imbalance in high-speed optical communication systems, improving performance for advanced modulation formats.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Digital Communications

    Background:

    • Next-generation coherent optical systems require higher symbol rates and modulation cardinality.
    • Transmitter and receiver IQ imbalance degrades system performance.
    • Existing correction methods often require pilots or have high computational complexity.

    Purpose of the Study:

    • To propose a novel, pilot-free carrier phase recovery algorithm for IQ imbalance compensation.
    • To develop a receiver-side IQ imbalance correction method using geometric parameter extraction.
    • To enhance the performance and reduce computational complexity in high-speed optical communication systems.

    Main Methods:

    • A reference constellation adaptation-based single-tap algorithm for transmitter IQ imbalance.
    • A pilot-free geometric parameter extraction method for receiver IQ imbalance.
    • Numerical simulations for 32 GBaud polarization multiplexed (PM)-16QAM and 64QAM.
    • Experimental verification for 32 GBaud PM-16QAM signal.

    Main Results:

    • The proposed algorithm effectively compensates for transmitter IQ imbalance.
    • The pilot-free receiver method accurately corrects IQ imbalance.
    • Simulations and experiments confirm the effectiveness for high-order modulation formats.
    • The scheme demonstrates robustness across different modulation formats.

    Conclusions:

    • The developed pilot-free scheme offers a computationally efficient solution for IQ imbalance.
    • This approach is applicable to various modulation formats in coherent optical communications.
    • The proposed methods significantly improve system performance degraded by IQ imbalance.