Publications de Svyatoslav Kharitonov

Design and analysis of depolarized four-wave mixing in dhalcogenide photonic crystal fibers

Camille Sophie Brès, Svyatoslav Kharitonov, Arman Ayan

IEEE2021

Add-Drop Multiplexing Architecture for Nyquist OTDM Signals Based on a Single Mach-Zehnder Modulator

Camille Sophie Brès, Jianqi Hu, Svyatoslav Kharitonov, Simon Julien Fabbri

We propose and compare add-drop multiplexing schemes for Nyquist OTDM signals based on 1 x2 or 2 x2 Mach-Zehnder modulator. Bright and dark sinc pulse carver simultaneously provided by the modulator fulfil drop, notch and add functions. ...

IEEE2019

Microjoule-level widely tunable gain-switched thuliumdoped fiber laser

Camille Sophie Brès, Svyatoslav Kharitonov

We demonstrate the hybrid-pumped (continuous-wave+pulsed) gain-switched smallcore thulium-doped fiber laser tunable in 1825-2064nm spectral range that delivers 50-300ns pulses with energies up to 12μJ (65μJ of injected pump) reaching performance of larger- ...

OSA Publishing2019

Linearly chirped mid-infrared supercontinuum in all-normal-dispersion chalcogenide photonic crystal fibers

Camille Sophie Brès, Jianqi Hu, Svyatoslav Kharitonov, Sida Xing

2018

Fiber fuse in chalcogenide photonic crystal fibers

Camille Sophie Brès, Jianqi Hu, Svyatoslav Kharitonov, Sida Xing

We observe fiber fuse in tapered GeAsSe photonic crystal fibers (PCF) at around 7 MW∕cm2 of intra-core intensity. Vertically cleaved facets from the un-tapered regions and the tapered regions were imaged. The images show shallow voids of different shapes c ...

2018

Theta laser

Camille Sophie Brès, Svyatoslav Kharitonov

An unidirectional short-wave infrared fiber laser, comprising a theta cavity, with a gain unit based on rare-earth cations-doped fiber, the theta cavity having a ring cavity with two additional 2 input ports×2 output ports directional couplers DC1 and DC2 ...

2018

Experimental and theoretical investigation of the operating principles of the Figure-9 laser, Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF)

Camille Sophie Brès, Ivan Cardea, Svyatoslav Kharitonov

We present a theoretical vectorial model, validated by experimental measurements, describing the dependence of the Figure-9 laser output power, operating in continuous wave, on the coupling ratio of the directional coupler. ...

Optical Society of America2018

Mid-infrared continuous-wave parametric amplification in chalcogenide microstructured fibers

Camille Sophie Brès, Davide Grassani, Svyatoslav Kharitonov, Sida Xing

The persistent growth of interest in the middle infrared (MIR) is stimulating the development of sources and components. Novel waveguides and fibers for the efficient use of nonlinear effects in the MIR are being intensively studied. Highly nonlinear silic ...

2017

MIR supercontinuum in all-normal dispersion Chalcogenide photonic crystal fibers pumped with 2μm femtosecond laser

Camille Sophie Brès, Davide Grassani, Jianqi Hu, Svyatoslav Kharitonov, Sida Xing

We demonstrate mid-infrared supercontinuum generation in an all-normal dispersion Chalcogenide PCF pumped by fiber laser. The -20dB bandwidth is 1.7~2.7μm dominated by self-phase modulation and optical wave breaking. Tapering is proposed to improve perform ...

OSA2017

Unidirectional isolator-free 2 micron fiber lasers

Svyatoslav Kharitonov

This thesis presents results of a research on unidirectional isolator-free cavity lasers, exploiting thulium-doped fiber (TDF) as amplification medium and operating in \unit[2]{\mu m} wavelength range. For fibre ring resonator, an optical isolator should b ...

EPFL2017