Spectral correlations in a random distributed feedback fibre laser

Srikanth Sugavanam, Mariia Sorokina, Dmitry V. Churkin

Research output: Contribution to journalArticle

Abstract

Random distributed feedback fibre lasers belong to the class of random lasers, where the feedback is provided by amplified Rayleigh scattering on sub-micron refractive index inhomogenities randomly distributed over the fibre length. Despite the elastic nature of Rayleigh scattering, the feedback mechanism has been insofar deemed incoherent, which corresponds to the commonly observed smooth generation spectra. Here, using a real-time spectral measurement technique based on a scanning Fabry-Pérot interferometer, we observe long-living narrowband components in the random fibre laser's spectrum. Statistical analysis of the ∼104 single-scan spectra reveals a preferential interspacing for the components and their anticorrelation in intensities. Furthermore, using mutual information analysis, we confirm the existence of nonlinear correlations between different parts of the random fibre laser spectra. The existence of such narrowband spectral components, together with their observed correlations, establishes a long-missing parallel between the fields of random fibre lasers and conventional random lasers.

Original languageEnglish
Article number15514
Number of pages8
JournalNature Communications
Volume8
DOIs
Publication statusPublished - 18 May 2017

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spectral correlation
Distributed feedback lasers
distributed feedback lasers
Fiber lasers
fiber lasers
Lasers
Rayleigh scattering
narrowband
information analysis
Feedback
Information analysis
statistical analysis
Interferometers
lasers
Refractive index
Statistical methods
Refractometry
interferometers
refractivity
Scanning

Bibliographical note

© The Author(s) 2017. This work is licensed under a Creative Commons Attribution 4.0 International License.The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated other wise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Cite this

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title = "Spectral correlations in a random distributed feedback fibre laser",
abstract = "Random distributed feedback fibre lasers belong to the class of random lasers, where the feedback is provided by amplified Rayleigh scattering on sub-micron refractive index inhomogenities randomly distributed over the fibre length. Despite the elastic nature of Rayleigh scattering, the feedback mechanism has been insofar deemed incoherent, which corresponds to the commonly observed smooth generation spectra. Here, using a real-time spectral measurement technique based on a scanning Fabry-P{\'e}rot interferometer, we observe long-living narrowband components in the random fibre laser's spectrum. Statistical analysis of the ∼104 single-scan spectra reveals a preferential interspacing for the components and their anticorrelation in intensities. Furthermore, using mutual information analysis, we confirm the existence of nonlinear correlations between different parts of the random fibre laser spectra. The existence of such narrowband spectral components, together with their observed correlations, establishes a long-missing parallel between the fields of random fibre lasers and conventional random lasers.",
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Spectral correlations in a random distributed feedback fibre laser. / Sugavanam, Srikanth; Sorokina, Mariia; Churkin, Dmitry V.

In: Nature Communications, Vol. 8, 15514, 18.05.2017.

Research output: Contribution to journalArticle

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