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Related Experiment Video

Updated: Jun 20, 2026

Multimodal Imaging and Spectroscopy Fiber-bundle Microendoscopy Platform for Non-invasive, In Vivo Tissue Analysis

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Index-profiling method for preforms and multimode fibers.

S Kawakami, K Shiraishi, K Yasuda

|September 1, 2009

Summary

A new refractive-index profiling technique using a butterfly-shaped filter accurately measures optical fiber preforms and multimode fibers. This improved bound near-field method enhances precision and applicability for various fiber types.

Area of Science:

Optical Science
Materials Science
Fiber Optics

Background:

Accurate refractive-index profiling is crucial for optical fiber characterization.
Existing methods like the bound near-field method have limitations, including leaky modes.

Purpose of the Study:

To introduce and validate an improved refractive-index profiling technique.
To enhance the accuracy and applicability of near-field optical measurements.

Main Methods:

Development of an improved bound near-field method incorporating a butterfly-shaped spatial filter.
Experimental verification using optical fiber preforms and multimode fibers.

Main Results:

The technique successfully measured the refractive-index distribution of an optical-fiber preform.

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Results showed excellent agreement with thin-slice interferometry measurements.

Validity was confirmed through application to a multimode fiber.

Conclusions:

The proposed butterfly-shaped filter technique effectively eliminates leaky modes for precise refractive-index profiling.
This method offers a reliable and accurate approach for characterizing optical fibers and preforms.
The technique shows potential for application to necked-down preforms.