TY - JOUR
T1 - Spectral correlations in a random distributed feedback fibre laser
AU - Sugavanam, Srikanth
AU - Sorokina, Mariia
AU - Churkin, Dmitry V.
N1 - © 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/
PY - 2017/5/18
Y1 - 2017/5/18
N2 - 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.
AB - 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.
UR - https://www.nature.com/articles/ncomms15514
UR - http://www.scopus.com/inward/record.url?scp=85019631206&partnerID=8YFLogxK
U2 - 10.1038/ncomms15514
DO - 10.1038/ncomms15514
M3 - Article
AN - SCOPUS:85019631206
SN - 2041-1723
VL - 8
JO - Nature Communications
JF - Nature Communications
M1 - 15514
ER -