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Updated: Jun 2, 2026

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Coupling between counterpropagating cladding modes in fiber Bragg gratings.

D Sáez-Rodriguez¹, J L Cruz, A Díez

¹Department of Applied Physics and Electromagnetism, University of Valencia, Dr. Moliner 50, Burjassot 46100, Spain.

|April 19, 2011

Summary

This summary is machine-generated.

We demonstrated energy transfer between optical cladding modes in a fiber Bragg grating (FBG). This research observed resonances between forward and backward propagating modes with 30 pm bandwidth and 8 dB rejection.

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Area of Science:

Optical Physics
Materials Science
Photonics

Background:

Fiber Bragg gratings (FBGs) are crucial optical components.
Understanding cladding mode behavior is essential for advanced optical devices.
Energy transfer mechanisms in optical fibers require further investigation.

Purpose of the Study:

To experimentally demonstrate and characterize energy transfer between counterpropagating cladding modes within an FBG.
To investigate the resonances and coupling effects between different cladding modes.
To quantify the efficiency and characteristics of this energy transfer phenomenon.

Main Methods:

Fabrication of a strong fiber Bragg grating in standard photosensitive optical fiber.
Illumination of the FBG with a single, specific cladding mode.
Utilizing two auxiliary long period gratings to measure power transfer.
Analyzing the spectral characteristics of the transferred energy.

Main Results:

Successful experimental demonstration of energy transfer between counterpropagating cladding modes.
Observation of distinct resonances between cladding modes.
Measured resonance bandwidth of 30 pm.
Achieved a maximum rejection of 8 dB for observed resonances.

Conclusions:

Energy transfer between counterpropagating cladding modes in FBGs is experimentally feasible.
The observed resonances indicate strong mode coupling and energy exchange.
The characterized bandwidth and rejection provide key parameters for FBG design and applications.