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Optical rogue waves in coupled fiber Raman lasers.

S Kolpakov, S V Sergeyev, A Udalcovs

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    Researchers demonstrated a new mechanism for optical rogue wave emergence in coupled fiber Raman lasers. This phenomenon arises from the interaction between two Raman cascades and orthogonal polarization states.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Fiber Optics

    Background:

    • Coupled linear cavity-random fiber Raman lasers exhibit complex dynamics.
    • Optical rogue waves are extreme amplitude events with anomalous statistics.

    Purpose of the Study:

    • To experimentally demonstrate a novel mechanism for the emergence of optical rogue waves in coupled fiber Raman lasers.
    • To investigate the role of coupled Raman cascades and polarization states in rogue wave generation.

    Main Methods:

    • Experimental setup involving a linear cavity laser (1.55 µm) coupled with a random laser (1.67 µm).
    • Analysis of coupled orthogonal states of polarization (SOPs) and their influence on laser dynamics.
    • Observation and statistical analysis of random pulse generation and anomalous spikes.

    Main Results:

    • First experimental demonstration of a new mechanism for optical rogue wave emergence in this laser system.
    • Rogue waves observed due to coupling of two Raman cascades and orthogonal SOPs.
    • Coherent coupling of SOPs led to trajectory localization, while polarization instability caused chaotic oscillations.

    Conclusions:

    • The interplay between coupled Raman cascades and polarization dynamics is crucial for rogue wave formation.
    • Antiphase dynamics suppress low-amplitude oscillations, enabling anomalous spikes characteristic of rogue waves.
    • This study provides new insights into the fundamental mechanisms underlying extreme events in fiber lasers.