Slow light propagation in a ring erbium-doped fiber

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Controlling light propagation speed is crucial for optical signal processing and telecommunications.
• Coherent Population Oscillations (CPO) offer a method to manipulate light-matter interactions.
• Erbium-doped fibers are widely used in optical amplifiers and lasers.

Purpose of the Study:

• To demonstrate slow light propagation in a novel fiber optic configuration.
• To investigate the effectiveness of Coherent Population Oscillations in a doped silica fiber.
• To achieve slow light without spatial distortion of the optical mode.

Main Methods:

• Implementation of Coherent Population Oscillations (CPO) in a silica fiber.
• Doping the fiber with erbium ions arranged in a ring around the single-mode core.
• Utilizing the interaction of light mode wings with the doped region.

Main Results:

• Achieved slow light propagation with group velocities as low as 1360 m/s.
• Observed no spatial distortion of the propagating optical mode.
• Demonstrated effective CPO in the doped fiber despite limited interaction with the core mode.

Conclusions:

• The proposed fiber configuration effectively enables slow light generation via CPO.
• This technique offers a promising pathway for developing new optical delay lines and signal processing devices.
• The absence of spatial distortion is a key advantage for practical applications.