Endface index profiling of optical fiber preforms.

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Accurate characterization of optical fiber preforms is crucial for manufacturing high-performance optical fibers.
• Existing methods for determining refractive-index profiles can be complex or lack direct visualization.

Purpose of the Study:

• To introduce a new, effective method for obtaining the 3-D refractive-index profile of optical fiber preforms.
• To present two distinct implementations of this technique for different analytical needs.

Main Methods:

• The method relies on analyzing the refraction of light from an endface cut perpendicular to the preform axis.
• One implementation utilizes spatial filtering for quantitative index data and 3-D graphic plotting.
• The second implementation employs novel spatial modulation for direct, visual 3-D index profile display.

Main Results:

• Successful development of two variants of the refractive-index profiling technique.
• Demonstration of quantitative data acquisition and 3-D graphical representation.
• Achievement of direct visual imaging of the 3-D refractive-index profile.

Conclusions:

• The described technique provides a versatile approach to optical fiber preform analysis.
• The method facilitates detailed understanding and quality control in optical fiber production.
• Both quantitative and visual outputs enhance the characterization capabilities for optical fiber preforms.