Spectral broadening in Raman fiber lasers

Babin, Sergey A.; Churkin, Dmitry V.; Ismagulov, A. E.; Kablukov, S. I.; Podivilov, E. V.

doi:10.1364/ol.31.003007

Cited by 70 publications

(28 citation statements)

References 12 publications

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“…Meanwhile, it is well known that nonlinear broadening is a crucial factor determining spectral shape of the generation of Raman fiber lasers [43][44][45] and the spectral width of the random DFB fiber lasers depends both on nonlinearity and dispersion 40 . We consider here only the region of the pump power under and near the generation threshold, where nonlinear effect are negligible because of small Stokes wave power.…”

Section: Spectral Balance Modelmentioning

confidence: 99%

Modeling of the spectrum in a random distributed feedback fiber laser within the power balance modes

Vatnik

Churkin

2014

SPIE Proceedings

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The simplest model for a description of the random distributed feedback (RDFB) Raman fiber laser is a power balance model describing the evolution of the intensities of the waves over the fiber length. The model predicts well the power performances of the RDFB fiber laser including the generation threshold, the output power and pump and generation wave intensity distributions along the fiber. In the present work, we extend the power balance model and modify equations in such a way that they describe now frequency dependent spectral power density instead of integral over the spectrum intensities. We calculate the generation spectrum by using the depleted pump wave longitudinal distribution derived from the conventional power balance model. We found the spectral balance model to be sufficient to account for the spectral narrowing in the RDFB laser above the threshold of the generation.

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Section: Spectral Balance Modelmentioning

confidence: 99%

Modeling of the spectrum in a random distributed feedback fiber laser within the power balance modes

Vatnik

Churkin

2014

SPIE Proceedings

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“…From a different perspective, optical cavities and lasers offer an interesting experimental platform to study different regimes of optical turbulence [12,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. In particular, the phenomenon of condensation of photons has been recently demonstrated in optical microcavities [38], which raised important questions such as the relation between lasing and condensation [39].…”

Section: Introductionmentioning

confidence: 99%

Weak Langmuir optical turbulence in a fiber cavity

Garnier

Mussot

et al. 2016

Phys. Rev. A

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We study theoretically and numerically the dynamics of a passive optical fiber ring cavity pumped by a highly incoherent wave -an incoherently injected fiber laser. The theoretical analysis reveals that the turbulent dynamics of the cavity is dominated by the Raman effect. The forced-dissipative nature of the fiber cavity is responsible for a large diversity of turbulent behaviors: Besides nonequilibrium statistical stationary states, we report the formation of a periodic pattern of spectral incoherent solitons, or the formation of different types of spectral singularities, e.g., dispersive shock waves and incoherent spectral collapse behaviors. We derive a mean-field kinetic equation that describes in detail the different turbulent regimes of the cavity and whose structure is formally analogous to the weak Langmuir turbulence kinetic equation in the presence of forcing and damping. A quantitative agreement is obtained between the simulations of the nonlinear Schrödinger equation with cavity boundary conditions and those of the mean-field kinetic equation and the corresponding singular integro-differential reduction, without using adjustable parameters. We discuss the possible realization of a fiber cavity experimental set-up in which the theoretical predictions can be observed and studied.

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“…Thus, the output radiation of conventional RFL consists of numerous longitudinal modes, up to 10 8 . Longitudinal modes interact with each other in the long nonlinear and dispersive RFL cavity, which results in stochastic radiation which can be described in the terms of wave turbulence [4][5][6][7] . As a result, the time dynamics of the RFL is complex with non-trivial statistical properties [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Influence of the generated power, measurement bandwidth, and noise level on intensity statistics of a quasi-CW Raman fiber laser

2014

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In the present paper we numerically study instrumental impact on statistical properties of quasi-CW Raman fiber laser using a simple model of multimode laser radiation. Effects, that have the most influence, are limited electrical bandwidth of measurement equipment and noise. To check this influence, we developed a simple model of the multimode quasi-CW generation with exponential statistics (i.e. uncorrelated modes). We found that the area near zero intensity in probability density function (PDF) is strongly affected by both factors, for example both lead to formation of a negative wing of intensity distribution. But far wing slope of PDF is not affected by noise and, for moderate mismatch between optical and electrical bandwidth, is only slightly affected by bandwidth limitation. The generation spectrum often becomes broader at higher power in experiments, so the spectral/electrical bandwidth mismatch factor increases over the power that can lead to artificial dependence of the PDF slope over the power. It was also found that both effects influence the ACF background level: noise impact decreases it, while limited bandwidth leads to its increase.

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Spectral broadening in Raman fiber lasers

Cited by 70 publications

References 12 publications

Modeling of the spectrum in a random distributed feedback fiber laser within the power balance modes

Modeling of the spectrum in a random distributed feedback fiber laser within the power balance modes

Weak Langmuir optical turbulence in a fiber cavity

Influence of the generated power, measurement bandwidth, and noise level on intensity statistics of a quasi-CW Raman fiber laser

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