Raman fiber laser with random distributed feedback based on a twin-core fiber

Area of Science:

• Optics and Photonics
• Fiber Lasers
• Nonlinear Optics

Background:

• Random fiber lasers offer potential for cost-effective laser generation.
• Achieving narrow linewidths and controlling polarization in random fiber lasers remains a challenge.
• Polarization-maintaining fibers are crucial for stable, high-quality laser output.

Purpose of the Study:

• To demonstrate the first operation of a linearly polarized Raman fiber laser with random distributed feedback.
• To investigate the use of polarization-maintaining twin-core fiber (TCF) for enhanced laser performance.
• To analyze the factors contributing to linewidth reduction in the proposed laser configuration.

Main Methods:

• Fabrication and operation of a Raman fiber laser utilizing a polarization-maintaining twin-core fiber.
• Characterization of laser output, including linewidth and polarization properties.
• Comparison of performance with a conventional random fiber laser.

Main Results:

• Successful demonstration of a linearly polarized Raman fiber laser with random distributed feedback.
• Achieved a linewidth approximately five times narrower compared to conventional random fiber lasers.
• Identified reduced nonlinear effects and spectrally selective properties of TCF as key reasons for linewidth narrowing.

Conclusions:

• Polarization-maintaining twin-core fiber enables significant linewidth reduction in random distributed feedback Raman fiber lasers.
• The TCF design mitigates nonlinear effects and introduces spectral selectivity, leading to improved laser performance.
• This work presents a promising approach for developing high-performance, narrow-linewidth random fiber lasers.