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Title: Prof.

First Name: Otakar

Last Name: Wilfert

Affiliation: Brno University of Technology

Website: http://www.feec.vutbr.cz/UREL

Research area and interests

The research work is divided into theoretical and experimental part. In theoretical part, the research work is focused on modelling of the turbulent atmosphere affecting optical beams. Classifying the atmospheric phenomena with regard to transmission demands and service type utilizing the link are investigated. The complex model of the optical wireless link which represents synthesis of both steady and statistical model was developed.

In experimental part, the research work is focused on searching and finding methods deteriorating effect of the atmospheric turbulence on the required quality of communication. The experimental research also includes finding the optimal optical sources for the optical wireless communications and investigation of the optimal optical beam shape mitigating the atmospheric turbulence effect on transmission reliability.

System aspects of the optical wireless link transceiver and corresponding elements are also investigated. The concept of all-photonic transceiver using only optical fiber and passive optical fiber elements is studied. Transmission and physical limits for the optical wireless communication are specified.


Research Facilities

Hardware

Past:

· Dual testing optical link (ATMO TL-02_DUAL) for observation of atmospheric influences on the transmitted laser beam (self-developed)

Technical data ATMO TL - 02_DUAL

Laser diode 1

RLT1550-15G/max 15mW

Wavelength λ1

1550 nm

Mean transmitted power P1m, TXA

7 mW

Laser diode 2

DL5032/max 40mW

Wavelength λ2

830 nm

Mean transmitted power P2m, TXA

12 mW

Beam divergence ft

10 mrad

Diameter of the transmitter apertureDTXA

2 x 25,4 mm

Receiver photodiode

FGA10/ SFD = 0,81 mm2

Diameter of the receiver aperture DRXA

60 mm

Dynamic range Δ

90 dB

Link distance L12

60 m

· Atmospheric pressure measurement PTB100A

· Rain rate measurement MR3H

· Wind speed and direction, relative humidity

· Visibility sensor Vaisala PWD22

· Optical receiver LONG RANGE 830 for satellite signal (receiver for low-level optical signals) – self-developed

Technical specifications of the receiver LONG RANGE 830

Photodiode

APD C30902S

Active surface of the photodiode

0.5 mm

Internal gain of photodiode

250

Wavelength λ

830 nm

Diameter of the receiver lens (Fresnel)

460 mm

Focal length of the receiver lens (Fresnel)

460 mm

Receiver gain

32 dB

Attenuation on the cover glass

-1.0 dB

Attenuation on the optical system

-0.8 dB

Attenuation on the interference filter

-3.0 dB

Noise equivalent power on the photodiode (10 Mbps/OOK)

-86 dBm

Dynamic range

30 dB

Sensitivity of the receiver at the receiver aperture

-61 dBm

· Two fully equipped laboratories of optical communications:

Optical Breadboards with Accessories

IR Laser Beam Profiler (0.35μm - 1.5μm)

Digital IR Viewers (0.35μm - 1.7μm)

Optical Power Meters (0.38μm - 1.8μm)

Lasers, Laser Diodes, Detectors

Heaters simulating turbulences in atmosphere

Fog chamber with fog generator

Spectrometers for VIS and near IR

Present:

Additionally:

· Fourier spectrometer MIR8025 Modular IR Fourier Spectrometer (up to 8300nm)

· MP1800A Signal Quality Analyzer

· EDFA 1550nm (Keopsys KPS-CUS-BT-C)

· XY sensor (1m x 1m) for measurement of optical intensity distribution in the beam

· OPOTEK Tunable Laser System Vibrant (HE) 355II (200nm – 2000nm, pulsed)

· Video inspection probe FIP-400-P-DUAL

Future:

· Photon counting OTDR for 850nm and 1550nm (LOR-220 for MMF 670nm and 810nm; LOR-200 for SMF 1550nm)

· Extension module for MIR8025 Modular IR Fourier Spectrometer (up to 20 000nm)

Software

· SW model in MATLAB® of mode distribution in optical fibre (SM i MM) Video inspection probe FIP-400-P-DUAL

· SW model in MATLAB® of influence of diffraction on the optical intensity distribution of the beam Video inspection probe FIP-400-P-DUAL

· SW model in MATLAB® of power attenuation of an optical systems (in case of partially obscured beams) Video inspection probe FIP-400-P-DUAL

· SW of stationary and statistical model of optical wireless link Video inspection probe FIP-400-P-DUAL

Measurement Database

· Databases of statistical parameters of atmosphere at given sites (hundreds sites worldwide)


Contact Information

Mailing Address: Purkynova 464/118, 61200 Brno, Czech Republic

Phone: +420 541 149 130

Fax: : +420 541 149 130

E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Skype address: N/A

 

 

Announcements

 

1. OPTICWISE becomes an Associate Member of the 5G PPP.

 

2. OPTICWISE participates in the preparation of new IEEE standart on OWC.

 

3. IWOW 2014 Workshop Proceedings are now available at IEEExplore! All papers can be accessed through this link.

 

4. OPTICWISE Chair to Give Keynote Speech at BlackSeaCom Conference.

 

5. IWOW 2013 Workshop Proceedings are now available at IEEExplore! All papers can be accessed through this link.


6. COST IC1101 OPTICWISE Action World Record: A FSO link at 1.6 Tbit/s (see more details on SPIE Vol 52, Issue 11, Nov 2013). 

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