Martin Grábner, Ph.D.

Research interests: 

Numerical modelling of electromagnetic wave propagation in optical waveguides, Propagation of electromagnetic waves in atmosphere

Professional activities: 

2019 - today: Institute of Photonics and Electronics, Czech Academy of Sciences - research scientist

2008 - 2019: Czech Metrology Institute (CMI) - research scientist

2000 - 2008: Technical Centre of Telecommunications and Posts (TESTCOM) - research & development engineer

Education:

2008: Ph.D. - Faculty of Electrical Engineering, Czech Technical University in Prague; Doctoral thesis: “Identification of parameters of nonlinear HEMT model from the system of scattering parameters” (in Czech) 

2000: Ing. - Faculty of Electrical Engineering, Czech Technical University in Prague, master degree

Current Research projects:

Member of the projects:

• Transparent ceramics optical fibers for lasers operating around 2.9 μm

Selected past projects:

Co-solver:

• GAČR 17-16389S, Hydrological estimates from radiowave propagation in terrestrial microwave network
• GAČR 14-01527S, Basic research of propagation of electromagnetic waves in the atmospheric boundary layer for low elevation links
• GAČR P102/11/1376, Effects of propagation impairments on error performance of future broadband terrestrial wireless systems
• GAČR P102/10/1901, Basic research of radiometeorology properties of tropospheric ducting layers by using artificial intelligence methods
• GAČR P102/07/0955, Research of electromagnetic wave refraction and refractivity height profiles in troposphere

Team member:

• Research of novel geometries and layouts of double-clad rare-earth-doped fibers for high power fiber lasers
• GAČR 102/05/0571, Methods for availability improvement of free space optics communications,
• COST IC0802, COST 297, COST 280

Publications:

Selected journal/conference papers:

1. M. Grábner, P. Peterka, P. Honzátko „Formula for temperature distribution in multi-layer optical fibres for high-power fibre lasers,“ Opto-Electronics Review 29, 126-132, (2021). Link 
2. M. Grábner, K. Nithyanandan, P. Peterka, P. Koška, A. A. Jasim, P. Honzátko "Simulations of Pump Absorption in Tandem-Pumped Octagon Double-Clad Fibers," IEEE Photonics Journal, Vol. 13, No. 2, pp. 1-14, 1500314, (2021). Link
3. F. Todorov, J. Aubrecht, P. Peterka, O. Schreiber, A. A. Jasim, J. Mrázek, O. Podrazký, M. Kamrádek, N. Kanagaraj, M. Grábner, Y. Baravets, J. Cajzl, P. Koška, A. Fišar, I. Kašík, P. Honzátko "Active Optical Fibers and Components for Fiber Lasers Emitting in the 2-μm Spectral Range", Materials, 13, 5177 (2020). Link.
4. M. Grabner, P. Pechac, P. Valtr: “Analysis of Propagation of Electromagnetic Waves in Atmospheric Hydrometeors on Low-Elevation Paths”, Radioengineering 27 (1), 29-33, 2018.
5. M. Grabner, P. Pechac, P. Valtr: “On horizontal distribution of vertical gradient of atmospheric refractivity”, Atmospheric Science Letters 18 (7), 294-299, 2017.
6. M. Grabner, V. Kvicera: “Multiple scattering in rain and fog on free-space optical links”, Journal of lightwave technology 32 (3), 513-520, 2014.
7. M. Grabner, V. Kvicera, P. Pechac, M. Kvicera, P. Valtr, A. Martellucci: “World maps of atmospheric refractivity statistics”, IEEE Transactions on Antennas and Propagation 62 (7), 3714-3722, 2014.
8. M. Grabner, V. Kvicera, O. Fiser: “Rain attenuation measurement and prediction on parallel 860-nm free space optical and 58-GHz millimeter-wave paths”, Optical Engineering 51 (3), 031206, 2012.
9. M. Grabner, V. Kvicera: “Measurement of the structure constant of refractivity at optical wavelengths using a Scintillometer”, Radioengineering 21 (1), 455-458, 2012.
10. M. Grabner, V. Kvicera: “The wavelength dependent model of extinction in fog and haze for free space optical communication”, Optics express 19 (4), 3379-3386, 2011.
11. M. Grabner, V. Kvicera: “Atmospheric refraction and propagation in lower troposphere”, chapter 7 in Electromagnetic Waves, INTECH, 139-156, 2011.
12. M. Grabner, V. Kvicera, P. Pechac, O. Jicha: “Vertical dependence of refractive index structure constant in lowest troposphere”, IEEE Antennas and Wireless Propagation Letters 10, 1473-1475, 2011.
13. M. Grabner, J. Dobes: “Parameter extraction of HEMT models from multibias s-parameters”, in Proc. of IEEE International Symposium on Circuits and Systems (ISCAS), 2085 – 2088, 2009.
14. M. Grabner, V. Kvicera: “Refractive index measurements in the lowest troposphere in the Czech Republic”, Journal of atmospheric and solar-terrestrial physics 68 (12), 1334-1339, 2006.
15. M. Grabner, U.-C. Fiebig, V. Kvičera: “Generator of Time Series of Rain Attenuation: Results of Parameter Extraction”, Radioengineering 14 (1), 32-36, 2005.
16. M. Grabner, V. Kvicera: “Clear-air propagation modeling using parabolic equation method”, Radioengineering 12 (4), 50-54, 2003.
17. M. Grabner, V. Kvicera: “Refractive index measurement at TV tower Prague”, Radioengineering 12 (1), 5-7, 2003.