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Your search keyword '"SMIRNOV, SERGEY"' showing total 76 results
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76 results on '"SMIRNOV, SERGEY"'

27. Influence of Kerr nonlinearity on PT-transition in coupled fibre lasers

Author

Taccheo, S., Mackenzie, J., Ferrari, M., Smirnov, Sergey Valeryevich, Makarenko, Maxim O., Sukhorukov, Andrey, Vatnik, I. D., Churkin, D. V., Taccheo, S., Mackenzie, J., Ferrari, M., Smirnov, Sergey Valeryevich, Makarenko, Maxim O., Sukhorukov, Andrey, Vatnik, I. D., and Churkin, D. V.

Abstract

This work investigates a concept of coupled fiber lasers exhibiting PT-symmetry and a PT-transition between PTsymmetric and PT-broken lasing states. We consider a system operated via Raman gain comprising two fiber loops (ring cavities) connected to each other by means of two fiber couplers with adjustable phase shift between them. By changing the phase shift or/and amplification (loss) in fiber loops, one can switch between generation regimes, realizing either PTsymmetric or PT-broken solution. In the PT-symmetric lasing regime, equal powers are generated in both cavities despite only active one is pumped. We make theoretical and numerical description of the proposed coupled fiber lasers starting with the simple discrete matrix model taking into account coupling, phase delays, gain (which is assumed to be saturated), losses and nonlinear phase shift. We show how the PT-transition is affected by self-phase modulation inside the fiber cavity and investigate requirements that should be met in order to observe PT-transition experimentally despite Kerr effect that violates exact symmetry conditions. In particular, we show that PT-transition may be observable only near lasing threshold. Further on we adopt more sophisticated model based on Nonlinear Schrödinger equation for PT fiber laser. Taking into account quasi-CW polychromatic radiation with typical spectral bandwidth of fiber Raman lasers, chromatic dispersion and Kerr nonlinearity, we demonstrate both PT-symmetric and PT-broken lasing in a fiber laser.

Published
2018

36. PT-symmetry of coupled fiber lasers

Author

Zhang, L., Jiang, L., Jiang, S., Wang, L., Smirnov, Sergey Valeryevich, Churkin, D. V., Makarenko, Maxim O., Vatnik, I. D., Suchkov, Sergey, Sukhorukov, Andrey, Zhang, L., Jiang, L., Jiang, S., Wang, L., Smirnov, Sergey Valeryevich, Churkin, D. V., Makarenko, Maxim O., Vatnik, I. D., Suchkov, Sergey, and Sukhorukov, Andrey

Abstract

In this work, we propose a concept of a coupled fiber laser exhibiting PT-symmetry properties. We consider a system operated via Raman gain. The scheme comprises two identical fiber loops (ring cavities) connected by means of two fiber couplers with variable phase shift between them. We show that by changing the phase shift one can switch between generation regimes, realizing either PT-symmetric or PT-broken solution. Furthermore, the paper investigates some peculiarities of the system such as power oscillations and the role of nonlinear phase shift in fiber rings.

Published
2017

47. Extreme value statistics in Raman fiber lasers

Author

Churkin, Dmitry V., Gorbunov, Oleg A., Smirnov, Sergey V., Honea, Eric C., and Hendow, Sami T.

Subjects
Physics::Optics
Abstract

We present the numerical study of the statistical properties of the partially coherent quasi-CW high-Q cavity Raman fiber laser. The statistical properties are different for the radiation generated at the spectrum center or spectral wings. It is found that rare extreme events are generated at the far spectral wings at one pass only. The mechanism of the extreme events generation is a turbulent-like four-wave mixing of numerous longitudinal generation modes. The similar mechanism of extreme waves appearance during the laser generation could be important in other types of fiber lasers.

Published
2012

48. Statistical properties of partially coherent CW fiber lasers

Author

Churkin, Dmitry V., Smirnov, Sergey V., Podivilov, Evgenii V., and Vodopyanov, Konstantin L.

Subjects
Physics::Optics, Physics::Atomic Physics
Abstract

A detailed quantitative numerical analysis of partially coherent quasi-CW fiber laser is performed on the example of high-Q cavity Raman fiber laser. The key role of precise spectral performances of fiber Bragg gratings forming the laser cavity is clarified. It is shown that cross phase modulation between the pump and Stokes waves does not affect the generation. Amplitudes of different longitudinal modes strongly fluctuate obeying the Gaussian distribution. As intensity statistics is noticeably non-exponential, longitudinal modes should be correlated.

Published
2011

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