Vector dark domain wall solitons in a fiber ring laser

Area of Science:

• Nonlinear optics
• Fiber laser physics
• Soliton dynamics

Background:

• Fiber ring lasers are complex systems exhibiting diverse nonlinear phenomena.
• Vector solitons, which involve multiple polarization states, are of significant interest.
• Previous research has explored various soliton types, but vector dark solitons in this configuration were uncharacterized.

Purpose of the Study:

• To experimentally observe and characterize a novel type of vector dark soliton.
• To investigate the properties of these solitons, specifically their polarization characteristics.
• To validate experimental findings through theoretical modeling.

Main Methods:

• Experimental observation of optical phenomena in a fiber ring laser.
• Characterization of localized structures separating orthogonal linear polarization eigenstates.
• Numerical simulations using coupled complex Ginzburg-Landau equations.

Main Results:

• Observation of a novel vector dark soliton in a fiber ring laser.
• The vector dark soliton comprises stable localized structures separating two orthogonal linear polarization eigenstates.
• These solitons are visible only when the total laser emission is measured.

Conclusions:

• A new class of vector dark solitons has been experimentally identified in fiber ring lasers.
• The observed solitons possess unique polarization-dependent properties.
• Numerical simulations confirm the experimental results, validating the underlying physics.