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Refractive-index profiling of single-mode optical fibers and preforms
Applied Optics
|March 11, 2010
Summary
A new focusing method accurately measures refractive-index profiles in optical fibers and preforms. This non-destructive technique provides rapid, high-resolution results for improved fiber characterization.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Accurate characterization of refractive-index profiles is crucial for single-mode optical fiber performance.
- Existing methods may be destructive or time-consuming.
Purpose of the Study:
- To present an automatic, non-destructive focusing method for measuring refractive-index profiles.
- To validate the technique for various doped optical fibers and preforms.
Main Methods:
- Immersion of the fiber/preform in index-matching oil.
- Transverse transmission of collimated light.
- Detection of transmitted light intensity using a video camera and computer-controlled analysis.
Main Results:
- Refractive-index profiles measured for boron-doped and germanium-doped fibers/preforms.
- Maximum refractive index differences (Deltan) ranged from 0.0006 to 0.012.
- Repeatability better than 1% and resolution better than 1 micrometer achieved.
Conclusions:
- The focusing method is a fast and accurate technique for profile measurement.
- Results show good agreement between fiber, preform, and slab sample profiles.
- This method enables efficient characterization of optical fiber materials.
