Multiwavelength generation in a random distributed feedback fiber laser using an all fiber Lyot filter

Area of Science:

• Photonics and Laser Technology
• Fiber Optics
• Nonlinear Optics

Background:

• Fiber lasers offer versatile light sources.
• Achieving stable multiwavelength output is crucial for applications like spectroscopy and telecommunications.
• Random distributed feedback (RDFB) fiber lasers present unique characteristics for light generation.

Purpose of the Study:

• To demonstrate stable multiwavelength lasing in an RDFB fiber laser.
• To investigate the use of an all-fiber Lyot filter for controlling lasing modes.
• To analyze the power distribution and underlying nonlinear processes in multiwavelength generation.

Main Methods:

• Utilized an all-fiber Lyot filter within a random distributed feedback fiber laser cavity.
• Observed and analyzed the spectral characteristics of the generated laser output.
• Investigated the phenomenon in both first and second Stokes wave generation.

Main Results:

• Successfully demonstrated stable multiwavelength lasing.
• Each lasing line exhibited sub-nanometer line-widths.
• A flat power distribution across multiple lines was achieved, indicating nonlinear power redistribution.

Conclusions:

• The all-fiber Lyot filter is effective for achieving stable multiwavelength lasing in RDFB fiber lasers.
• Nonlinear mixing processes play a significant role in the observed flat power distribution.
• The technique is applicable to both first and second Stokes wave generation, broadening its utility.