Apparatus and methods for analysing optical fibre

By analyzing Fresnel reflections from capillary walls in optical fibers, the method allows for real-time adjustment of the drawing process, addressing the challenge of monitoring internal dimensions and enhancing the quality of hollow core antiresonant fibers.

WO2026024349A1 Publication Date: 2026-01-29MICROSOFT TECHNOLOGY LICENSING LLC
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Patent Information

Application Number
PCT/US2025/030205
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-26
Filing Date
2025-05-20
Publication Date
2026-01-29

AI Technical Summary

Technical Problem

Existing methods for manufacturing optical fibers with complex internal structures, such as hollow core antiresonant fibers, struggle to monitor and control the internal dimensions accurately during the drawing process, leading to structural defects that affect performance and quality.

Method used

A non-destructive method and apparatus are used to analyze the internal structure of optical fibers by directing light onto the fiber, detecting Fresnel reflections from the capillary walls, and using the power level of the detected light to determine capillary wall thickness, allowing real-time adjustments to the drawing process.

Benefits of technology

Enables precise control of the internal structure of optical fibers during manufacturing, ensuring compliance with specifications and reducing defects, thereby improving the performance and quality of the fibers.

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Abstract

A method of analysing a hollow core antiresonant optical fibre having an inner cladding comprising at least one capillary defined by a wall with a wall thickness comprises: directing light onto the fibre for interaction with at least one surface of the capillary wall; detecting a portion of the light which has interacted with the at least one surface of the capillary wall to determine a power level of the detected portion; and using the power level to deduce information regarding the wall thickness.
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