Brillouin frequency shift error estimation formula for distributed optical fiber sensing technology based on...

Area of Science:

• Optics and Photonics
• Materials Science
• Electrical Engineering

Background:

• Distributed optical fiber sensing relies on Brillouin scattering for measurements.
• Existing Brillouin frequency shift (BFS) error estimation formulas have limitations.
• Accurate BFS error estimation is crucial for reliable sensing performance.

Purpose of the Study:

• To address the limitations of current BFS error estimation formulas.
• To propose a novel BFS error estimation formula for Brillouin-based distributed optical fiber sensing.
• To validate the accuracy and applicability of the new formula.

Main Methods:

• Systematic numerical generation of Brillouin spectra with varied parameters (frequency sweep span, SNR, linewidth, frequency step).
• Experimental measurement of Brillouin spectra using a Brillouin optical time domain reflectometer (BOTDR) with varying incident light pulse widths and frequency sweep spans.
• Comparative analysis of the proposed formula's errors against existing formulas using generated and measured spectra.

Main Results:

• The proposed BFS error estimation formula demonstrates higher accuracy compared to existing typical formulas.
• The improved accuracy is particularly evident when utilizing larger frequency sweep spans or incident light pulse widths.
• The new formula exhibits a significantly wider application range due to its enhanced performance.

Conclusions:

• The newly proposed BFS error estimation formula offers superior accuracy and a broader application scope.
• This advancement is critical for enhancing the reliability of distributed optical fiber sensing systems.
• The findings pave the way for more robust and versatile fiber optic sensing solutions.