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CPT-symmetric coupler with intermodal dispersion.

Dmitry A Zezyulin, Yaroslav V Kartashov, Vladimir V Konotop

    Optics Letters
    |April 1, 2017
    PubMed
    Summary
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    This study explores CPT symmetry in dual-core waveguides, demonstrating stable vector soliton propagation with balanced gain and loss. It reveals unique soliton behaviors influenced by dispersive coupling and gain-loss effects.

    Area of Science:

    • Nonlinear optics
    • Waveguide theory
    • Soliton physics

    Background:

    • Dual-core waveguides with balanced gain and loss are crucial for optical signal processing.
    • Conventional parity-time (PT) symmetry is often used to analyze such systems.
    • Understanding complex behaviors like vector soliton propagation is essential for advanced photonic devices.

    Purpose of the Study:

    • To investigate the symmetry properties of a dual-core waveguide system with balanced gain and loss.
    • To demonstrate the possibility of stable vector soliton propagation under specific conditions.
    • To analyze the influence of gain-loss and dispersive coupling on soliton dynamics.

    Main Methods:

    • Theoretical analysis of a dual-core waveguide model.
    • Investigation of CPT (charge-parity-time) symmetry, including spatial inversion.

    Related Experiment Videos

  • Derivation of analytical solutions for small-amplitude vector solitons.
  • Numerical analysis of soliton stability and dynamics.

    • Main Results:

    • The system obeys CPT symmetry, not conventional PT symmetry, due to coupled arms.
    • Second-order dispersion enables unbroken CPT symmetry and stable vector soliton propagation.
    • Explicit solutions for small-amplitude solitons were obtained.
    • Observed phenomena include component separation, velocity-dependent stability, and complex two-hump solutions.

    Conclusions:

    • CPT symmetry provides a framework for understanding stable vector solitons in non-Hermitian dual-core waveguides.
    • Dispersive coupling and gain-loss mechanisms lead to rich and tunable soliton behaviors.
    • The findings offer insights into the design of novel photonic devices utilizing nonlinear waveguide phenomena.