Prof. Andrei A. Fotiadi Profile

Prof. Andrei A. Fotiadi

Senior Researcher at University of Oulu, OPEM Unit

SPIE Involvement:

Author

Publications (68)

Proceedings Article | 5 June 2023 Poster + Paper

Brillouin-like effects in rare-earth-doped bi-directional optical fiber amplifiers

Andrei Fotiadi, Dmitry Korobko, Ivan Chapalo, Patrice Megret, Igor Zolotovskii

Proceedings Volume 12569, 125690I (2023) https://doi.org/10.1117/12.2665902

KEYWORDS: Optical gratings, Optical fibers, Acoustic waves, Wave propagation, Refractive index, Hole burning spectroscopy, Fiber amplifiers, Polarizability, Picosecond phenomena, Fiber lasers

Read Abstract +

Proceedings Article | 5 June 2023 Poster + Paper

Modulation instability of surface plasmon polaritons in graphene double-layer structure

Sergey Moiseev, Dmitry Korobko, Igor Zolotovskii, P. Mégret, I. Chapalo, A. Fotiadi

Proceedings Volume 12569, 125690G (2023) https://doi.org/10.1117/12.2665855

KEYWORDS: Graphene, Modulation, Surface plasmon polaritons, Gallium arsenide, Wave propagation, Pulse generators, Numerical simulations

Read Abstract +

Proceedings Article | 5 June 2023 Poster + Paper

Fine tuning of the repetition rate and stabilization of harmonically mode-locked fiber laser with CW component in the spectrum

Dmitry Korobko, Valeria Ribenek, Pavel Itrin, Dmitrii Sementsov, Patrice Mégret, Ivan Chapalo, Andrei Fotiadi

Proceedings Volume 12569, 125690H (2023) https://doi.org/10.1117/12.2665857

KEYWORDS: Continuous wave operation, Solitons, Fiber lasers, Mode locking, Laser resonators, Pulsed laser operation, Laser optics, Education and training, Polarization, Laser radiation

Read Abstract +

Proceedings Article | 31 May 2023 Poster + Paper

Stabilizing DFB laser injection-locked to an external polarization maintaining optical fiber ring cavity

Ivan Panyaev, Pavel Itrin, Dmitry Korobko, Dmitrij Sementsov, Ivan Chapalo, Patrice Mégret, Andrei Fotiadi

Proceedings Volume 12572, 125721K (2023) https://doi.org/10.1117/12.2665903

KEYWORDS: Laser stabilization, Fiber lasers, Laser frequency, Laser resonators, Feedback loops, Photodetectors, Semiconductor lasers, Optoelectronics, Cavity resonators, Laser optics

Read Abstract +

Proceedings Article | 31 May 2023 Poster + Paper

Brillouin interaction between single optical modes excited in multimode fibers

Andrei Fotiadi, Edik Rafailov, Dmitry Korobko, Ivan Chapalo, Patrice Mégret, Alexander Bykov, Igor Meglinski

Proceedings Volume 12572, 125721L (2023) https://doi.org/10.1117/12.2665904

KEYWORDS: Optical fibers, Multimode fibers, Acoustic waves, Wave propagation, Planar waveguides, Laser scattering, Diffraction, Singular optics, Single mode fibers, Fiber lasers

Read Abstract +

Proceedings Article | 30 May 2023 Poster + Paper

Soliton Raman shift wavelength tuning through the pump pulse polarization control

Dmitry Korobko, Ivan Panyaev, Pavel Itrin, Dmitrii Sementsov, Patrice Mégret, Ivan Chapalo, Andrei Fotiadi

Proceedings Volume 12573, 125730Z (2023) https://doi.org/10.1117/12.2665863

KEYWORDS: Polarization, Raman spectroscopy, Solitons, Tunable filters, Optical filters, Fiber lasers, Picosecond phenomena, Autocorrelation, Wavelength tuning, Polarization control

Read Abstract +

Proceedings Article | 26 May 2022 Poster + Paper

Modeling of Brillouin-like amplification in rare-earth-doped optical fibers

A. Fotiadi, D. Korobko, I. Zolotovskii

Proceedings Volume 12143, 121430I (2022) https://doi.org/10.1117/12.2621138

KEYWORDS: Optical fibers, Fiber amplifiers, Wave propagation, Optical amplifiers, Hole burning spectroscopy, Refractive index, Polarizability, Scattering, Modulation

Read Abstract +

Proceedings Article | 25 May 2022 Presentation + Paper

Generation of modulation instability-induced high-repetition-rate pulse train with high-phase modulation depth

Aleksei Abramov, Igor Zolotovskii, Vladimir Kamynin, Andrei Domanov, Aleksandr Alekseev, Dmitriy Korobko, Marina Yavtushenko, Andrei Fotiadi

Proceedings Volume 12142, 1214211 (2022) https://doi.org/10.1117/12.2622312

KEYWORDS: Waveguides, Modulation, Dispersion, Light wave propagation, Frequency modulation, Optical fibers, Geometrical optics, Wave propagation, Refractive index, Ultrafast phenomena

Read Abstract +

Proceedings Article | 25 May 2022 Poster + Paper

Supermode noise suppression in harmonically mode-locked fiber laser by continuous wave injection

Dmitry Korobko, Pavel Itrin, Valeria Ribenek, Dmitrii Stoliarov, Andrei Fotiadi

Proceedings Volume 12142, 1214214 (2022) https://doi.org/10.1117/12.2621025

KEYWORDS: Solitons, Fiber lasers, Mode locking, Solid state lighting, Pulsed laser operation, Polarization, Optical filters, Laser applications, Semiconductor lasers

Read Abstract +

Proceedings Article | 25 May 2022 Presentation + Paper

Giant pulse generation in the fibers with inscribed Bragg gratings

Aleksei Abramov, Igor Zolotovskii, Vladimir Kamynin, Victor Prikhodko, Aleksei Tregubov, Dmitriy Stolyarov, Marina Yavtushenko, Andrei Fotiadi

Proceedings Volume 12142, 1214212 (2022) https://doi.org/10.1117/12.2622291

KEYWORDS: Optical fibers, Fiber Bragg gratings, Dispersion, Frequency modulation, Fermium, Refractive index, Modulation, Bragg gratings, Ultrafast phenomena, Reflectivity

Read Abstract +

Proceedings Article | 25 May 2022 Poster + Paper

Harmonically mode-locked fiber laser with fine repetition rate tuning through continuous wave injection

Dmitry Korobko, Valeria Ribenek, Dmitrii Stoliarov, Andrei Fotiadi

Proceedings Volume 12142, 1214215 (2022) https://doi.org/10.1117/12.2621029

KEYWORDS: Solitons, Fiber lasers, Laser resonators, Polarization, Mode locking, Optical filters, Pulsed laser operation, Laser optics, Switching

Read Abstract +

Proceedings Article | 24 May 2022 Poster + Paper

Plasmon excitation in array of double-walled carbon nanotubes by free-electron beam

Aleksei Kadochkin, Igor Zolotovskii, Sergey Moiseev, Andrei Fotiadi

Proceedings Volume 12131, 121310X (2022) https://doi.org/10.1117/12.2621584

KEYWORDS: Nanoplasmonics, Surface plasmon polaritons, Electron beams, Carbon nanotubes, Terahertz radiation

Read Abstract +

Proceedings Article | 20 May 2022 Poster + Paper

Stabilizing Brillouin lasing in high-Q optical fiber cavity pumped from self-injection locked DFB laser

J. L. Bueno-Escobedo, S. V. Miridonov, Ma. Carmen Maya-Sánchez, D. A. Korobko, I. O. Zolotovskii, A. Fotiadi

Proceedings Volume 12141, 121410J (2022) https://doi.org/10.1117/12.2621113

KEYWORDS: Fiber lasers, Laser stabilization, Feedback loops, Semiconductor lasers, Polarization, Laser resonators, Optical fibers, Fiber optics, Electronic circuits

Read Abstract +

Proceedings Article | 17 May 2022 Poster + Paper

Brillouin optical time domain analysis with dual-frequency self-injection locked DFB laser

Cesar Lopez-Mercado, Pavel Itrin, Dmitry Korobko, Igor Zolotovskii, Andrei Fotiadi

Proceedings Volume 12139, 121391D (2022) https://doi.org/10.1117/12.2621130

KEYWORDS: Fiber lasers, Laser sources, Spatial resolution, Laser optics, Laser stabilization, Electrooptic modulators, Fiber optics sensors

Read Abstract +

Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Peculiar features of surface plasmon-polariton modulation instability in a metal film with varying thickness

Dmitry Korobko, Igor Zolotovskii, Sergey Moiseev, Andrei Fotiadi

Proceedings Volume 11770, 117701L (2021) https://doi.org/10.1117/12.2589109

Read Abstract +

Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Saturable absorber for ring fiber lasers on the base of coupler coated by CNTs

Dmitry Korobko, Dmitry Stoliarov, Pavel Itrin, Valeria Ribenek, Artem Sysa, Yury Shaman, Andrei Fotiadi

Proceedings Volume 11775, 117750X (2021) https://doi.org/10.1117/12.2589130

Read Abstract +

Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Stable harmonic mode locking in soliton fiber laser with frequency shift: theory and experiment

Dmitry Korobko, Dmitry Stoliarov, Pavel Itrin, Valeria Ribenek, Andrei Fotiadi, Regina Gumenyuk

Proceedings Volume 11770, 117701N (2021) https://doi.org/10.1117/12.2589124

KEYWORDS: Solitons, Mode locking, Fiber lasers, Pulsed laser operation, Telecommunications, Spectroscopy, Scientific classification systems, Reliability, Optical filters, Numerical simulations

Read Abstract +

Soliton fiber lasers with passive harmonic mode-locking (HML) have been known for several decades as reliable sources of pulse trains with a high repetition rate. They are commonly employed as frequency comb generators in a wide list of applications in spectroscopy, telecommunications, microwave photonics. Besides that exhibiting advantageous consumer properties, such as compactness, reliability, low cost and convenience of beam delivery approach these sources are among the most attractive alternatives for material processing, medicine lasers and other areas. In the first group of these lasers the HML occurs due to special intra-cavity periodic filter with a free spectral range (FSR) which is a multiple of the main cavity FSR and equals to the pulse repetition rate. The second group of HML lasers in this classification is attractive for the scientific community due to the automatic arrangement of strongly periodic pulse pattern in the laser cavity through pulse repulsion. However, it is difficult to specify the mechanism of pulse repulsion for each case. It can be based on interaction through saturating and relaxing dissipative parameters, continuous-wave (CW) radiation component, dispersion waves, or acoustic waves induced by electrostriction, etc. A common feature of all interaction induced effects is low intensity, in many cases only slightly exceeding the noise level. The noise-induced fluctuations in the time interval of the HML pulse train are known as HML timing jitter, and its value is significantly higher than the timing jitter in lasers operating at fundamental frequency. It is a major drawback of the HML laser technology. We report the stabilizing frequency shift effect in harmonic mode-locking ring soliton fiber laser that is studied theoretically and numerically. We demonstrate that the frequency shift contributes to an increase in the hardness of interpulse interactions and can led to stabilization of the periodic arrangement of pulses. The experiment carried out confirms the theoretical predictions and the results of numerical simulation.

Proceedings Article | 18 April 2021 Presentation + Paper

Stabilizing Brillouin fiber laser for applications in distributed BOTDA sensing

V. Spirin, C. A. Lopez-Mercado, P. Mégret, D. Korobko, I. Zolotovskii, A. Fotiadi

Proceedings Volume 11772, 1177207 (2021) https://doi.org/10.1117/12.2589112

KEYWORDS: Fiber lasers, Semiconductor lasers, Laser scattering, Spatial resolution, Semiconductors, Scattering, Optoelectronics, Light scattering, Laser systems engineering, Laser sources

Read Abstract +

Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Microwave signal generation with a dual-frequency self-injection-locked DFB laser

C. Lopez-Mercado, J. Bueno-Escopedo, M. C. Maya-Sanchez, S. Miridovov, D. Korobko, I. Zolotovskii, V. Spirin, A. Fotiadi

Proceedings Volume 11770, 117701M (2021) https://doi.org/10.1117/12.2589111

KEYWORDS: Fiber lasers, Signal generators, Microwave radiation, Tunable lasers, Semiconductor lasers, Spectroscopy, Sensors, Semiconductors, Precision measurement, Optoelectronics

Read Abstract +

Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Dual-frequency narrowband CW fiber laser implementing self-injection locking of DFB laser diode and Brillouin lasing in a single ring cavity

V. Spirin, J. Bueno-Escopedo, C. Lopez-Mercado, P. Mégret, D. Korobko, I. Zolotovskii, A. Fotiadi

Proceedings Volume 11770, 117701K (2021) https://doi.org/10.1117/12.2589106

KEYWORDS: Fiber lasers, Semiconductor lasers, Continuous wave operation, Laser scattering, Telecommunications, Standards development, Scattering media, Scattering, Optoelectronics, Light scattering

Read Abstract +

Linewidth narrowing and stabilization of semiconductor laser light generation is of great research interest governed by the huge demand of compact cost-effective narrow-band laser sources for many potential applications. In 2012 we have demonstrated a simple kHz-linewidth laser just splicing a standard distributed feedback (DFB) laser diode and a few passive telecommunication components. The principle of operation employs the mechanism of self-injection locking that significantly improves DFB laser performance. While a typical linewidth of free-running DFB semiconductor lasers ranges from a few to tens MHz, self-injection locking of a DFB laser through an external fiber ring cavity causes a drastic reduction of its laser linewidth down to a few kHz. The advantage of the proposed configuration is that the same external fiber ring cavity could be used for self-injection locking of a DFB laser and as Brillouin scattering media to generate Stokes shifted optical wave. However, a continuous laser operation at two frequencies has not been reported yet preventing it from many prosperous photonic applications. Here, we introduce a simple dual-frequency laser configuration. In our approach, the implementation of self-injection locking into the Brillouin ring fiber laser helps to maintain coupling between the DFB laser and an external high-Q fiber cavity enabling dual-frequency laser operation. Specifically, the same ring fiber cavity is used to generate narrow-band light at the pump frequency (through self-injection locking mechanism) and narrow-band laser light at Stokes frequency (through stimulated Brillouin scattering). The system is supplied by a low-bandwidth active optoelectronic feedback circuit controlled by a low-cost USB-DAQ card that helps the laser to maintain the desired operation mode. The fiber configuration reduces the natural Lorentzian linewidth of light emitted by the laser at pump and Stokes frequencies down to 270 Hz and 220 Hz, respectively, and features a stable 300-Hz-width RF spectrum recorded with the beating of two laser outputs. We have explored key features of the laser performance, revealing its stability and applicability to RF harmonic generation of high spectral purity as an additional benefit of the proposed technique.