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Modulation format identification aided hitless flexible coherent transceiver.

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    We developed a novel modulation format identification (MFI) scheme for flexible coherent transceivers in dynamic optical networks. This hitless system efficiently adapts to changing modulation formats without performance loss.

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    Area of Science:

    • Optical communication systems
    • Digital signal processing
    • Network engineering

    Background:

    • Dynamic agile optical networks require flexible coherent transceivers capable of adapting to varying modulation formats.
    • Existing modulation format identification (MFI) schemes can introduce overhead or lack flexibility for diverse formats.

    Purpose of the Study:

    • To propose a novel, hitless flexible coherent transceiver utilizing an efficient MFI scheme for dynamic optical networks.
    • To enable seamless adaptation to arbitrary modulation formats, including multi-dimensional and changing formats within short data blocks.

    Main Methods:

    • A modulation format-transparent digital signal processing (DSP) approach using a block-wise decision-directed least-mean-square (DD-LMS) equalizer for channel tracking.
    • A pilot symbol-aided superscalar phase-locked loop (PLL) for carrier phase estimation (CPE), with MFI information encoded onto pilot symbols.
    • Evaluation across five modulation formats: QPSK, 16QAM, 64QAM, Hybrid QPSK/8QAM, and SP-512-QAM.

    Main Results:

    • The proposed MFI scheme achieves identification without requiring extra overhead by encoding information onto existing pilot symbols.
    • The system successfully tracks modulation format changes for short data blocks, demonstrating hitless operation.
    • Negligible performance penalty was observed with the proposed MFI method across various modulation formats.

    Conclusions:

    • The developed hitless flexible coherent transceiver with the novel MFI scheme effectively supports dynamic agile optical networks.
    • Experimental validation confirms the transceiver's ability to adapt to fast, block-by-block modulation format switching.
    • The MFI method offers performance improvements compared to existing techniques and supports a wide range of modulation formats.