Stimulated Brillouin scattering gain profile characterization by interaction between two narrow-linewidth optical...

Area of Science:

• Optics and Photonics
• Fiber Optic Communications

Background:

• Stimulated Brillouin Scattering (SBS) is a nonlinear optical phenomenon in optical fibers.
• Understanding SBS is crucial for optical sensing, signal processing, and high-power fiber lasers.
• Characterizing SBS spectra provides insights into fiber properties and nonlinear interactions.

Purpose of the Study:

• To characterize Stimulated Brillouin Scattering (SBS) spectra in standard single-mode fiber.
• To investigate the evolution of SBS parameters like linewidth and gain profile.
• To explore the potential of SBS response for optical filtering applications.

Main Methods:

• Utilized two counter-propagating tunable laser sources (TLS) as pump and probe signals.
• Measured SBS spectra across a wide frequency span around the probe signal.
• Analyzed SBS spectra at various pump and probe power levels.
• Assumed negligible TLS linewidth compared to SBS gain bandwidth.

Main Results:

• Measured SBS spectra for standard single-mode fiber.
• Observed the evolution of SBS gain profile from Lorentzian to Gaussian with varying power levels.
• Demonstrated high signal-to-noise ratio measurements.
• Confirmed theoretical predictions for SBS gain profile evolution.

Conclusions:

• The study successfully characterized SBS spectra in single-mode fiber.
• The observed transition in SBS gain profile validates current SBS theory.
• The findings highlight the potential of utilizing SBS response for advanced optical filtering.