Distributed phase birefringence measurements based on polarization correlation in phase-sensitive optical time-domain...

Area of Science:

• Optics and Photonics
• Materials Science
• Telecommunications Engineering

Background:

• Distributed birefringence measurement is crucial for optical fiber characterization.
• Existing methods may lack the required spatial resolution or accuracy for detailed profiling.
• Understanding birefringence is key for applications in telecommunications and sensing.

Purpose of the Study:

• To propose and validate a novel technique for measuring the distributed birefringence profile along optical fibers.
• To enable precise, localized measurements of refractive index differences between polarization axes.
• To achieve metric spatial resolution for evaluating longitudinal fluctuations in birefringence.

Main Methods:

• Utilizing spectral correlation between orthogonally-polarized measurements from a phase-sensitive optical time-domain reflectometer (ϕOTDR).
• Analyzing the frequency detuning of a correlation peak, which is proportional to local birefringence.
• Experimentally validating the technique on standard single-mode and polarization-maintaining fibers.

Main Results:

• The proposed method successfully measures distributed birefringence profiles.
• Experimental validation confirmed the technique's ability to quantify local phase birefringence.
• Metric spatial resolution was achieved, allowing precise evaluation of longitudinal fluctuations.

Conclusions:

• The spectral correlation technique provides an effective means for distributed birefringence measurement in optical fibers.
• This method offers high spatial resolution for detailed fiber characterization.
• Potential applications include advanced optical fiber characterization for telecommunications and distributed sensing.