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Spatial technique for measuring modal delay differences in a dual-mode optical fiber.

N Shibata, M Tateda, S Seikai

|March 12, 2010

Summary

A new spatial interferometry method accurately measures the group delay time difference in dual-mode optical fibers. This technique is effective for short fibers and small time differences, showing good agreement with existing methods.

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Area of Science:

Optics and Photonics
Optical Fiber Communications

Background:

Measuring modal group delay differences is crucial for optical fiber characterization.
Existing methods like swept-frequency and pulse methods have limitations.

Purpose of the Study:

To propose and validate a simple spatial interferometry method for measuring group delay time differences.
To assess the method's applicability to short optical fibers and small time differences.

Main Methods:

Utilizing a coherent light source and an interferometer.
Employing a spatial measurement technique to analyze dual-mode optical fibers (LP(01) and LP(11) modes).

Main Results:

Experimental results show good agreement with swept-frequency and pulse methods.

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A group delay time difference of 4 picoseconds was successfully measured.

The method demonstrated potential for measuring small time differences (around 1 picosecond).

Conclusions:

The proposed spatial method offers a simple and effective approach for measuring modal group delay.
This technique is suitable for characterizing short optical fibers (less than 1 meter).
Further refinement with laser diodes of short coherence length can enhance precision for picosecond-level measurements.