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Writing Bragg Gratings in Multicore Fibers

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Three-step design optimization for multi-channel fibre Bragg gratings.

Kazimir Kolossovski, Rowland Sammut, Alexander Buryak

|May 26, 2009

Summary

This study presents a three-step method for designing multi-channel fiber Bragg gratings (FBGs) with consistent spectral characteristics. The approach offers superior results for a moderate number of channels, applicable to other fields.

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Area of Science:

Photonics and Optical Engineering
Materials Science
Signal Processing

Background:

Multi-channel fiber Bragg gratings (FBGs) are crucial optical components.
Achieving identical channel-to-channel spectral characteristics in FBGs is challenging.
Existing optimization methods have limitations for complex FBG designs.

Purpose of the Study:

To develop a novel, efficient method for designing optimal multi-channel FBGs.
To ensure consistent spectral characteristics across all channels.
To provide a robust optimization technique applicable beyond FBG design.

Main Methods:

A three-step optimization process is introduced: preliminary semi-analytic minimization, fine-tuning, and spectral characteristic quality improvement.

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The initial two steps are generalizable, relying only on the number of channels.

The final step is specific to FBG design for enhanced spectral performance.

Main Results:

The proposed method successfully produces optimal multi-channel FBG designs with highly similar spectral characteristics.
A comparison demonstrates superior performance compared to existing optimization techniques for N < 60 channels.
The generalizable nature of the initial steps suggests broad applicability.

Conclusions:

The presented three-step approach is effective for optimizing multi-channel FBGs.
This method offers a significant improvement for designing FBGs with consistent spectral properties.
The technique's adaptability makes it valuable for related fields like radio-physics and coding theory.