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Related Experiment Video

Updated: Apr 10, 2026

Writing Bragg Gratings in Multicore Fibers

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Published on: April 20, 2016

Multi-core fiber interferometer using spatial light modulators for measurement of the inter-core group index

Hee Jung Lee, Han Seb Moon, Sang-Kyung Choi

|June 16, 2015

Summary

Researchers developed a new method to control light patterns in multi-core fibers. This technique precisely manipulates core modes for advanced optical applications.

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Area of Science:

Optics and Photonics
Fiber Optics
Quantum Information

Background:

Multi-core fibers (MCF) enable advanced optical functionalities but controlling light propagation within them is challenging.
Generating and measuring arbitrary superpositions of modes is crucial for applications like optical sensing and communication.

Purpose of the Study:

To demonstrate an experimental technique for generating and measuring arbitrary superpositions of core modes in MCF.
To verify the phase tunability of the developed multi-path interferometer.
To estimate inter-core group index differences with high resolution.

Main Methods:

Utilized two spatial light modulators to couple a single-mode fiber's fundamental mode with multiple core modes of an MCF.
Constructed a Mach-Zehnder-type multi-path interferometer.
Analyzed two-, three-, and four-path interference patterns in the wavelength domain.

Main Results:

Successfully generated and measured arbitrary superpositions of core modes.
Verified phase tunability by comparing experimental interference patterns with theoretical predictions.
Achieved a resolution of 10^-5 for estimating inter-core group index differences using a 1m fiber.

Conclusions:

The demonstrated technique provides precise control over light propagation in MCF.
This method enables accurate measurement of inter-core group index differences.
The findings pave the way for enhanced optical sensing and communication systems utilizing MCF.