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Extraction of Attenuation and Backscattering Coefficient along Hollow-Core Fiber Length Using Two-Way Optical Time

Xuhao Wei¹, Eric Numkam Fokoua², Francesco Poletti¹

¹Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, U.K.

ACS Photonics

|October 21, 2024

Summary

Researchers developed a new method for analyzing optical time domain reflectometry (OTDR) signals in hollow-core fibers (HCFs). This technique separates distributed loss and backscattering, improving HCF characterization and performance.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Area of Science:

Optical Fiber Technology
Photonics
Materials Science

Background:

Optical time domain reflectometry (OTDR) is crucial for characterizing optical fibers and distributed sensing.
OTDR in hollow-core fibers (HCFs) is significantly weaker and challenging due to geometric variations affecting backscattering.
Accurate HCF characterization is vital for improving fabrication and expanding applications.

Purpose of the Study:

To develop a method for separating distributed loss and backscattering coefficients in antiresonant HCFs.
To enable accurate measurement of HCF loss and uniformity.
To facilitate the continuous improvement of HCF performance and broaden their applications.

Main Methods:

Utilizing OTDR traces acquired from both ends of the antiresonant HCF.
Developing algorithms to distinguish between loss variations and backscattering coefficient changes along the fiber.
Analyzing the unique properties of HCFs to overcome previous OTDR limitations.

Main Results:

Successfully demonstrated the separation of distributed loss and backscattering coefficient in HCFs.
Obtained key data on fiber distributed loss and uniformity for the first time.
Validated the effectiveness of using bidirectional OTDR measurements for HCF analysis.

Conclusions:

The developed method provides essential data for HCF fabrication and performance enhancement.
This breakthrough enables more precise characterization of HCFs, paving the way for wider adoption.
Bidirectional OTDR is a powerful tool for advancing HCF technology and applications.