Dispersion-managed solitons in a fiber loop with in-line filtering

Area of Science:

• Nonlinear Optics
• Optical Fiber Communications
• Soliton Physics

Background:

• Soliton propagation in optical fibers is crucial for high-speed data transmission.
• Dispersion management techniques are essential for maintaining pulse integrity over long distances.
• Fiber loops offer a platform for studying long-term pulse dynamics.

Purpose of the Study:

• To investigate soliton propagation in a fiber loop incorporating dispersion management, in-line filters, and frequency shifting.
• To understand the factors contributing to stable pulse formation and propagation in such a system.
• To compare experimental results with numerical modeling for validation.

Main Methods:

• Numerical simulations of soliton propagation.
• Experimental recirculating loop setup.
• Inclusion of dispersion management, in-line filters, and frequency shifting within the fiber loop.

Main Results:

• Stable soliton pulses were observed with enhanced power compared to uniform dispersion fibers.
• The majority of the fiber (over 90%) operated in the normal-dispersion regime, yet the net dispersion was anomalous.
• In-line filtering and frequency shifting were found to be critical for pulse shaping due to small path-averaged dispersion.

Conclusions:

• The fiber loop configuration enables stable soliton propagation over extended distances (demonstrated up to 28,000 km).
• Dispersion management combined with filtering and frequency shifting effectively controls soliton dynamics.
• Experimental findings align well with computer modeling, validating the proposed system for robust optical pulse transmission.