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Dive into the research topics where Alexey Pnev is active.

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Featured researches published by Alexey Pnev.


Laser Physics Letters | 2015

Ultra-short pulse generation in the hybridly mode-locked erbium-doped all-fiber ring laser with a distributed polarizer

Alexander A. Krylov; Stanislav G. Sazonkin; Vladimir A. Lazarev; Dmitriy A. Dvoretskiy; Stanislav O. Leonov; Alexey Pnev; Valeriy E. Karasik; Vyacheslav V. Grebenyukov; Anatoly S. Pozharov; Elena D. Obraztsova; Evgeny M. Dianov

We report for the first time to the best of our knowledge on the ultra-short pulse (USP) generation in the dispersion-managed erbium-doped all-fiber ring laser hybridly mode-locked with boron nitride-doped single-walled carbon nanotubes in the co-action with a nonlinear polarization evolution in the ring cavity with a distributed polarizer. Stable 92.6 fs dechirped pulses were obtained via precise polarization state adjustment at a central wavelength of 1560 nm with 11.2 mW average output power, corresponding to the 2.9 kW maximum peak power. We have also observed the laser switching from a USP generation regime to a chirped pulse one with a corresponding pulse-width of 7.1 ps at the same intracavity dispersion.


Optics Express | 2015

High-energy, sub-100 fs, all-fiber stretched-pulse mode-locked Er-doped ring laser with a highly-nonlinear resonator.

Dmitriy A. Dvoretskiy; Vladimir A. Lazarev; Vasiliy S. Voropaev; Zhanna N. Rodnova; Stanislav G. Sazonkin; Stanislav O. Leonov; Alexey Pnev; Valeriy E. Karasik; Alexander A. Krylov

We report on ultra-short stretched pulse generation in an all-fiber erbium-doped ring laser with a highly-nonlinear germanosilicate fiber inside the resonator with a slightly positive net-cavity group velocity dispersion (GVD). Stable 84 fs pulses were obtained with a 12 MHz repetition rate at a central wavelength of 1560 nm with a 48.1 nm spectral pulse width (full width at half maximum, FWHM) and 30 mW average output power; this corresponds to the 29.7 kW maximum peak power and 2.5 nJ pulse energy obtained immediately from the oscillator.


Journal of Physics: Conference Series | 2015

Experimental study of influence of nonlinear effects on phase- sensitive optical time-domain reflectometer operating range

Evgeny Nesterov; Andrey Zhirnov; Konstantin Stepanov; Alexey Pnev; V. E. Karasik; Ya A Tezadov; E.V. Kondrashin; A B Ushakov

This paper presents experimental results of a study the influence of nonlinear effects on the range of the phase-sensitive optical time-domain reflectometer. Results from measurements of the impact of the effects of stimulated Raman scattering, stimulated Brillouin scattering, self-phase modulation, and modulation instability are presented. It is shown that the power of the probe pulse for 200 ns does not exceed ≈300 mW.


Review of Scientific Instruments | 2016

Note: Gaussian mixture model for event recognition in optical time-domain reflectometry based sensing systems.

Aleksey Fedorov; Maxim Anufriev; Andrey Zhirnov; Konstantin Stepanov; Evgeniy Nesterov; Dmitry Namiot; V. E. Karasik; Alexey Pnev

We propose a novel approach to the recognition of particular classes of non-conventional events in signals from phase-sensitive optical time-domain-reflectometry-based sensors. Our algorithmic solution has two main features: filtering aimed at the de-nosing of signals and a Gaussian mixture model to cluster them. We test the proposed algorithm using experimentally measured signals. The results show that two classes of events can be distinguished with the best-case recognition probability close to 0.9 at sufficient numbers of training samples.


IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control | 2016

Stable Similariton Generation in an All-Fiber Hybrid Mode-Locked Ring Laser for Frequency Metrology

Vladimir A. Lazarev; Alexander Krylov; Dmitriy A. Dvoretskiy; Stanislav G. Sazonkin; Alexey Pnev; Stanislav O. Leonov; Dmitriy Shelestov; Mikhail K. Tarabrin; Valeriy E. Karasik; A. N. Kireev; Mikhail A. Gubin

Ultrashort pulse lasers constitute an important tool in the emerging field of optical frequency metrology and are enabling unprecedented measurement capabilities and new applications in a wide range of fields, including precision spectroscopy, atomic clocks, ultracold gases, and molecular fingerprinting. We demonstrate the generation of stable 127-fs self-similar pulses at a central wavelength of 1560 nm with 7.14-mW average output power. Similariton lasers have a low repetition rate deviation in the averaging time interval 1-1·103 s, a low relative intensity noise -120 dBc/Hz (30 Hz to 10 kHz), a narrow single comb line width of 32 kHz, and high reliability. Thus, such lasers are highly promising for further development of the stabilized combs and open up a robust and substantially simplified route to synthesizing low-noise microwaves.


arXiv: Optics | 2015

Structural monitoring system with fiber Bragg grating sensors: implementation and software solution

Aleksey Fedorov; Vladimir A. Lazarev; Ilya Makhrov; Nikolay Pozhar; Maxim Anufriev; Alexey Pnev; Valeriy E. Karasik

We present a structural health monitoring system for nondestructive testing of composite materials based on the fiber Bragg grating sensors and specialized software solution. The developed structural monitoring system has potential applications for preliminary tests of novel composite materials as well as real-time structural health monitoring of industrial objects. The software solution realizes control for the system, data processing, and alert of an operator.


international conference laser optics | 2016

Adaptation of the Er-Yb microchip laser for use in phase-sensitive optical time domain reflectometry

Andrey Zhirnov; Alexey Pnev; V. E. Karasik; Konstantin Stepanov; Dmitriy Shelestov; Michele Norgia; Alessandro Pesatori; C. Svelto

We report on the experiments related to the Er-Yb microchip laser setup with fiber diode pumping. The main goal is a new radiation source for the use in the phase-sensitive optical time domain reflectometry (φ-OTDR) development.


Quantum Electronics | 2016

Generation of ultrashort pulses with minimum duration of 90 fs in a hybrid mode-locked erbium-doped all-fibre ring laser

D. A. Dvoretskiy; Stanislav G. Sazonkin; Vasiliy S. Voropaev; M.A. Negin; Stanislav O. Leonov; Alexey Pnev; V. E. Karasik; Lev Denisov; Alexandr A. Krylov; Valeriy A. Davydov; Elena D. Obraztsova

Regimes of ultrashort pulse generation in an erbium-doped all-fibre ring laser with hybrid mode locking based on single-wall carbon – boron nitride nanotubes and the nonlinear Kerr effect in fibre waveguides are studied. Stable dechirped ultrashort pulses are obtained with a duration of , a repetition rate of , and an average output power of , which corresponds to a pulse energy of and a peak laser power of .


Photonics, Devices, and Systems VI | 2015

Stable similariton generation in hybrid mode-locked erbium-doped all-fiber ring laser for application in optical frequency standard

Stanislav G. Sazonkin; Alexander A. Krylov; Dmitriy A. Dvoretskiy; Stanislav O. Leonov; Vladimir A. Lazarev; Alexey Pnev; Valeriy E. Karasik; Vyacheslav V. Grebenyukov; Anatoly S. Pozharov; Elena D. Obraztsova

Recently similariton (or self-similar pulse) fiber lasers have attracted great attention due to their capabilities of highenergy pulse generation that could find different applications in science and industry. Moreover it is very important to reach stable pulse generation for the application as a frequency divider in optical frequency standard. Hybrid modelocking mechanism was used for obtaining stable similariton generation at 38 MHz pulse repetition frequency. It involves two types of mode-locking mechanisms in the cavity - saturation of carbon nanostructures absorber (recovery time Trt ~ 500 fs) and nonlinear polarization evolution based on the nonlinear Kerr-effect (Trt ~ 10 fs). It was shown that total intracavity dispersion should be slightly positive for generating stable similaritons with duration of less than 90 fs and spectral bandwidth of more than 50 nm at 11.2 mW output average power that could be further applied in an all-fiber MOPA setup.


Frontiers in Optics | 2015

Comb characterization of Erbium All-fiber Hybrid Mode-locked ultra-short pulse Ring laser for Frequency Metrology

Vladimir A. Lazarev; Alexander Krylov; Dmitriy A. Dvoretskiy; Stanislav G. Sazonkin; Alexey Pnev; Stanislav O. Leonov; Dmitriy Shelestov; V. E. Karasik; A. N. Kireev; Mikhail A. Gubin

Stable 92.6 fs dechirped self-similar pulses were obtained at 1560 nm with 11.2 mW average output power. Similariton laser has low repetition rate deviation at 1 - 103 s, a single comb linewidth of 110 kHz and high reliability, which makes it promising for further development of the stabilized comb.

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Stanislav G. Sazonkin

Bauman Moscow State Technical University

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V. E. Karasik

Bauman Moscow State Technical University

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Valeriy E. Karasik

Bauman Moscow State Technical University

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Dmitriy A. Dvoretskiy

Bauman Moscow State Technical University

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Dmitriy Shelestov

Bauman Moscow State Technical University

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Vladimir A. Lazarev

Bauman Moscow State Technical University

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Lev Denisov

Bauman Moscow State Technical University

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Andrey Zhirnov

Bauman Moscow State Technical University

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Stanislav O. Leonov

Bauman Moscow State Technical University

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