Dr. Vladimir P. Kalosha Profile

Dr. Vladimir P. Kalosha

at VI Systems GmbH

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Author

Publications (16)

Proceedings Article | 5 March 2021 Presentation + Paper

Narrow spectrum VCSEL development for high performance 100G transceivers and increased transmission distance over multimode fiber

N. Ledentsov, L. Chorchos, O. Makarov, J.-R. Kropp, V. Shchukin, V. Kalosha, J. Turkiewicz

Proc. SPIE. 11704, Vertical-Cavity Surface-Emitting Lasers XXV

KEYWORDS: Multimode fibers, Transceivers, Electronics, Interfaces, Receivers, Data processing, Vertical cavity surface emitting lasers

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Proceedings Article | 5 March 2021 Presentation + Paper

NRZ, DB, and DMT performance for short-reach VCSEL-based optical interconnects

Lukasz Chorchos, Nikolay Ledentsov, Oleg Makarov, Philipp Scholz, Urs Hecht, Christoph Kottke, Volker Jungnickel, Ronald Freund, Vitaly Shchukin, Vladimir Kalosha, Jarosław Turkiewicz, Friedel Gerfers

Proc. SPIE. 11692, Optical Interconnects XXI

KEYWORDS: Signal to noise ratio, Transmitters, Modulation, Wavelength division multiplexing, Receivers, Vertical cavity surface emitting lasers, Shortwaves, Optical interconnects, Binary data

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Proceedings Article | 24 February 2020 Paper

Oxidation stress induced birefringence in vertical cavity surface emitting lasers

N. Ledentsov, L. Chorchos, O. Makarov, J. -R. Kropp, V. Shchukin, V. P. Kalosha, Urs Hecht, P. Kurth, F. Gerfers, J. P. Turkiewicz, N. N. Ledentsov

Proc. SPIE. 11300, Vertical-Cavity Surface-Emitting Lasers XXIV

KEYWORDS: Multimode fibers, Switching, Modulation, Polarization, Birefringence, Receivers, Data transmission, Near field, Vertical cavity surface emitting lasers, Near field optics

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Proceedings Article | 24 February 2020 Presentation + Paper

Quantum-dot oxide-confined 850-nm VCSELs with extreme temperature stability operating at 25 Gbit/s up to 180deg C

N. Ledentsov, L. Chorchos, O. Makarov, J.-R. Kropp, V. A. Shchukin, V. P. Kalosha, J. P. Turkiewicz, N. Cherkashin, N. N. Ledentsov

Proc. SPIE. 11300, Vertical-Cavity Surface-Emitting Lasers XXIV

KEYWORDS: Oxides, Multimode fibers, Eye, Quantum wells, Resistance, Data transmission, Vertical cavity surface emitting lasers, Semiconducting wafers, Pulsed laser operation, Temperature metrology

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Proceedings Article | 24 February 2020 Presentation + Paper

Wavelength-stabilized near-field laser

V. A. Shchukin, V. P. Kalosha, N. Ledentsov, Ł. Chorchos, N. N. Ledentsov

Proc. SPIE. 11301, Novel In-Plane Semiconductor Lasers XIX

KEYWORDS: Semiconductors, Refractive index, Quantum wells, Dielectrics, Reflectivity, Data transmission, Vertical cavity surface emitting lasers, Semiconducting wafers, Near field optics

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Surface–trapped electromagnetic waves can be localized at a boundary between a semiconductor distributed Bragg reflector (DBR) and a homogeneous dielectric medium or air. These waves enable a novel class of both in–plane–emitting and vertically–emitting optical devices including edge–emitting lasers, disk microlasers, near–field fiber–coupled lasers as well as vertical cavity surface emitting lasers (VCSELs). We show that the surface–trapped modes can be controlled by tuning the thickness of a single DBR layer. Diagrams in variables “wavelength – thickness of the control layer” are constructed for both TM and TE optical modes revealing the parameter domains, in which surface–trapped modes exist. The domains contain cusps, in the vicinity of which surface–trapped modes are allowed only in a narrow spectral region, enabling wavelength–stabilized operation of a laser. For an edge–emitting structure designed for lasing at ~1 μm, the lasing wavelength shifts upon temperature at a rate ~0.07 nm/K. The fraction of the optical power of the surface–trapped mode accumulated in the air can reach ~60%. In oxide–confined VCSEL structures the surface–trapped mode can be used for engineering of the interaction with the VCSEL lasing modes. Deposition of an effective (3λ/4)–thick additional layer on top of the top DBR of the VCSEL allows surface–trapped modes to reach the wavelength of the VCSEL lasing modes. Interaction of these two types of generally non–orthogonal optical modes results in the lateral leakage of the VCSEL emission. Mapping of the VCSEL wafers in areas with the variable aperture diameters D shows non–monotonous behavior of side mode suppression ratio (SMRS) versus D oscillating in the range from 7 dB to ~30 dB with three clearly revealed maxima in the SMSR at particular aperture diameters varied in the range from ~3 μm to ~5 μm. Similar oscillatory behavior was previously predicted for a different type of leaky VCSELs. VCSELs with SMSR above 20 dB are tested for data transmission over a multimode fiber (MMF). 40Gb/s open eye data transmission over 1.4 km OM5 MMF without pre–emphasis or equalization is demonstrated is such device.

Proceedings Article | 1 March 2019 Presentation + Paper

Energy efficient 850-nm VCSEL based optical transmitter and receiver link capable of 56 Gbit/s NRZ operation

N. Ledentsov Jr., M. Agustin, L. Chorchos, J.-R. Kropp, V. Shchukin, V. Kalosha, M. Koepp, C. Caspar, J. Turkiewicz, N. Ledentsov

Proc. SPIE. 10938, Vertical-Cavity Surface-Emitting Lasers XXIII

KEYWORDS: Transmitters, Energy efficiency, Optical fabrication equipment, Modulation, Receivers, Optical fabrication, Vertical cavity surface emitting lasers, Connectors, Oscilloscopes

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Proceedings Article | 1 March 2019 Presentation + Paper

Comprehensive self-consistent analysis of oxide-confined vertical-cavity surface-emitting lasers

V. Kalosha, V. Shchukin, N. Ledentsov Jr., N. Ledentsov

Proc. SPIE. 10938, Vertical-Cavity Surface-Emitting Lasers XXIII

KEYWORDS: Quantum wells, Modulation, Diffusion, Resistance, Doping, Semiconductor lasers, Capacitance, Aluminum, Vertical cavity surface emitting lasers, Heterojunctions

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Proceedings Article | 19 February 2018 Paper

50 Gb/s NRZ and 4-PAM data transmission over OM5 fiber in the SWDM wavelength range

M. Agustin, N. Ledentsov, J.-R. Kropp, V. Shchukin, V. Kalosha, K. Chi, Z. Khan, J. W. Shi

Proc. SPIE. 10552, Vertical-Cavity Surface-Emitting Lasers XXII

KEYWORDS: Multimode fibers, Eye, Digital signal processing, Modulation, Signal attenuation, Dispersion, Data transmission, Picosecond phenomena, Vertical cavity surface emitting lasers, Forward error correction

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Proceedings Article | 19 February 2018 Paper

Thermally stable surface-emitting tilted wave laser

V. Shchukin, N. Ledentsov, V. Kalosha, M. Agustin, J. R. Kropp, M. Maximov, F. Zubov, Yu. M. Shernyakov, A. Payusov, N. Yu Gordeev, M. Kulagina, A. Zhukov

Proc. SPIE. 10552, Vertical-Cavity Surface-Emitting Lasers XXII

KEYWORDS: Semiconductors, Refractive index, Waveguides, Electroluminescence, Near field, Vertical cavity surface emitting lasers

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Novel lasing modes in a vertical-cavity surface-emitting laser (VCSEL)-type structure based on an antiwaveguding cavity are studied. Such a VCSEL cavity has an effective refractive index in the cavity region lower than the average index of the distributed Bragg reflectors (DBRs). Such device in a stripe geometry does not support in–plane waveguiding mode, and all modes with a high Q-factor are exclusively VCSEL-like modes with similar near field profile in the vertical direction. A GaAlAs–based VCSEL structure studied contains a resonant cavity with multiple GaInAs quantum wells as an active region. The VCSEL structure is processed as an edge-emitting laser with cleaved facets and top contact representing a non–alloyed metal grid. Rectangular-shaped ~400x400 µm pieces are cleaved with perpendicular facets. The contact grid region has a total width of ~70 μm. 7 μm–wide metal stripes serve as non–alloyed metal contact and form periodic rectangular openings having a size of 10x40 μm. Surface emission through the windows on top of the chip is measured at temperatures from 90 to 380 K. Three different types of modes are observed. The longest wavelength mode (mode A) is a VCSEL–like mode at ~854 nm emitting normal to the surface with a full width at half maximum (FWHM) of the far field ~10°. Accordingly the lasing wavelength demonstrates a thermal shift of the wavelength of 0.06 nm/K. Mode B is at shorter wavelengths of ~840 nm at room temperature, emitting light at two symmetric lobes at tilt angles ~40° with respect to the normal to the surface in the directions parallel to the stripe. The emission wavelength of this mode shifts at a rate 0.22 nm/K according to the GaAs bandgap shift. The angle of mode B with respect to the normal reduces as the wavelength approaches the vertical cavity etalon wavelength and this mode finally merges with the VCSEL mode. Mode B hops between different lateral modes of the VCSEL forming a dense spectrum due to significant longitudinal cavity length, and the thermal shift of its wavelength is governed by the shift of the gain spectrum. The most interesting observation is Mode C, which shifts at a rate 0.06 nm/K and has a spectral width of ~1 nm. Mode C matches the wavelength of the critical angle for total internal reflection for light impinging from semiconductor chip on semiconductor/air interface and propagates essentially as an in–plane mode. According to modeling data we conclude that the lasing mode represents a coupled state between the TM–polarized surface–trapped optical mode and the VCSEL cavity mode. The resulting mode has an extended near field zone and low propagation losses. The intensity of the mode drastically enhances once is appears at resonance with Mode B. A clear threshold is revealed in the L–I curves of all modes and there is a strong competition of the lasing mechanisms once the gain maximum is scanned over the related wavelength range by temperature change.

Proceedings Article | 19 February 2018 Paper

Temperature stable oxide-confined 850-nm VCSELs operating at bit rates up to 25 Gbit/s at 150ºC

N. Ledentsov, M. Agustin, J.-R. Kropp, V. Shchukin, V. Kalosha, K. Chi, Z. Khan, J. W. Shi

Proc. SPIE. 10552, Vertical-Cavity Surface-Emitting Lasers XXII

KEYWORDS: Oxides, Multimode fibers, Eye, Waveguides, Data transmission, Fiber lasers, Near field, Vertical cavity surface emitting lasers, Data communications, Temperature metrology

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Proceedings Article | 25 February 2017 Presentation + Paper

Robustness versus thermal effects of single-mode operation of vertical-cavity surface-emitting lasers with engineered leakage of high-order transverse optical modes

V. Kalosha, V. Shchukin, N. Ledentsov, J.-R. Kropp

Proc. SPIE. 10122, Vertical-Cavity Surface-Emitting Lasers XXI

KEYWORDS: Semiconductors, Oxides, Thermography, Refractive index, Dielectrics, Laser applications, Control systems, 3D modeling, Thermal effects, Distributed Bragg reflectors, Vertical cavity surface emitting lasers, Laser optics, Thermal modeling, Absorption

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Proceedings Article | 26 February 2010 Paper

Modeling of photonic-crystal-based high-power high-brightness semiconductor lasers

Vitaly Shchukin, Nikolai Ledentsov, Vladimir Kalosha, Thorsten Kettler, Kristijan Posilovic, Daniel Seidlitz, Dieter Bimberg, Nikita Yu. Gordeev, Leonid Ya. Karachinsky, Innokenty Novikov, Yuri Shernyakov, Alena Chunareva, Mikhail Maximov

Proc. SPIE. 7597, Physics and Simulation of Optoelectronic Devices XVIII

KEYWORDS: Waveguides, Cladding, High power lasers, Crystals, Photonic crystals, Semiconductor lasers, Near field, Phase matching, Active optics, Near field optics

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Proceedings Article | 12 February 2010 Paper

High-power high-brightness semiconductor lasers based on novel waveguide concepts

Dieter Bimberg, Kristijan Posilovic, Vladimir Kalosha, Thorsten Kettler, Daniel Seidlitz, Vitaly Shchukin, Nikolay Ledentsov, Nikita Gordeev, Leonid Karachinsky, Innokenty Novikov, Mikhail Maximov, Yuri Shernyakov, Alena Chunareva, Frank Bugge, Markus Weyers

Proc. SPIE. 7616, Novel In-Plane Semiconductor Lasers IX

KEYWORDS: Refractive index, Continuous wave operation, Waveguides, Cladding, High power lasers, Photonic crystals, Semiconductor lasers, Laser crystals, Waveguide lasers

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Proceedings Article | 12 August 2008 Paper

Feasibility of Kerr-lens mode locking in fiber lasers

V. Kalosha, Liang Chen, Xiaoyi Bao

Proc. SPIE. 7099, Photonics North 2008

KEYWORDS: Refractive index, Photonic crystal fibers, Dispersion, Glasses, Mode locking, Solid state lasers, Structured optical fibers, Fiber lasers, Laser crystals, Laser systems engineering

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Proceedings Article | 20 March 2006 Paper

Accurate strain detection and localisation with the distributed Brillouin sensor based on phenomenological signal processing approach

Fabien Ravet, Xiaoyi Bao, Lufan Zou, Qinrong Yu, Yun Li, Vladimir Kalosha, Liang Chen

Proc. SPIE. 6176, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V

KEYWORDS: Optical fibers, Continuous wave operation, Data modeling, Sensors, Signal processing, Structural health monitoring, Electrooptic modulators, Electro optical modeling, Temperature metrology

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Proceedings Article | 28 February 2006 Paper

Longitudinal photonic bandgap crystal laser diodes with ultra-narrow vertical beam divergence

M. Maximov, Yu. Shernyakov, I. Novikov, S. Kuznetsov, L. Ya. Karachinsky, N. Yu. Gordeev, I. Soshnikov, Yu. Musikhin, N. Kryzhanovskaya, A. Sharon, U. Ben-Ami, V. Kalosha, N. Zakharov, P. Werner, T. Kettler, K. Posilovic, V. Shchukin, N. Ledentsov, D. Bimberg

Proc. SPIE. 6115, Physics and Simulation of Optoelectronic Devices XIV

KEYWORDS: Refractive index, Light emitting diodes, Waveguides, Cladding, Crystals, Photonic crystals, Semiconductor lasers, Laser crystals, Geometrical optics, Near field optics

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Showing 5 of 16 publications

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