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ECTS Course Overview



Optical Communications II

* Exchange students do not have to consider this information when selecting suitable courses for an exchange stay.

Course Unit Code440-4115/02
Number of ECTS Credits Allocated6 ECTS credits
Type of Course Unit *Optional
Level of Course Unit *Second Cycle
Year of Study *
Semester when the Course Unit is deliveredSummer Semester
Mode of DeliveryFace-to-face
Language of InstructionCzech, English
Prerequisites and Co-Requisites Course succeeds to compulsory courses of previous semester
Name of Lecturer(s)Personal IDName
VAS40prof. RNDr. Vladimír Vašinek, CSc.
Summary
The transmission properties of the optical fibers create the content oh the subject. Further the connection and measurement of optical fiber and cables and the installation technology imagine the scope of subject.
Learning Outcomes of the Course Unit
Understand the proposal of optical transmission routes.

Learning outcomes are set so that the students are able to identify and apply tasks in the field of optoelectronics.
Course Contents
Lectures:
Advanced description of optical fibers 1 - Maxwell´s equations, interpretation of Maxwell´s equations, wave equations, solving wave equations, plane waves, propagation of the EM waves, wave equations for time-harmonic EM field, distribution of electical and magnetical part of wave in space, wave propagation in lossy medium, phase and group velocity of waves, group refraction index, EM waves in bounded media, rectangular waveguide, modes in waveguide, cutoff frequency and waveguide wavelengths, advanced description of total internal reflection, effects on boundary of two dielectrics, phase shift in total reflection, evanescent waves, reflectances and transmittances on boundary of two dielectrics, Goos-Haenchen shift
Advanced description of optical fibers 2 - Cylindrical fibers, modes of cylindrical fibers, LP modes, selecting rules for EM waves in optical fibers, waves and rays of optical fibers, meridional and skew rays, guided, radiation and leaky modes, optical power in fiber, power distribution between core and cladding, number of modes and measuremnt of attenuation
Advanced description of optical fibers 3 - Cutoff wavelength and cutoff normalised frquency of optical fiber, cutoff condition and total internal reflection, power confinement and cutoff condition, role of cladding, effective refractive index
Advanced description of optical fibers 4 - Attenuation in multimode fibers, general approach to attenuation, intrinsic losses, Rayleigh scattering, behaviour of SiO2 fibers, choice of operating wavelength, other materials for optical fibers production, fluoride fibers, chalkogen fibers, extrinsic absorption, macrobending loss, microbending loss, influence of mode structure to fiber attenuation, attenuation and attenuation constant, dispersion in multimode fibers, total dispersion and pulse width, electrical and optical bandwidth, mechanism of modal dispersion
Advanced description of optical fibers 5 - Chromatic dispersion, derivation of the formula for material dispersion, practical calculation of material dispersion according to datasheets, Sellmeier relations, influence of source spectral width, waveguide dispersion, description of bit rate and bandwidth in multimode fibers, choice of operating wavelength according to fiber dispersion, dispersion power penalty
Basics of singlemode fibers (SM fibers) - Principle of action, Gaussian beam, influence of core and cladding to mode field diameter (MFD), cutoff wavelength of SM fiber, attenuation in SM fibers, macrobending loss, microbending loss, absorption of light and light scattering of SM fibers, dispersion and bandwidth, chromatic dispersion, material dispersion, waveguide dispersion, coventional fibers, shifted fibers, dispersion flattened fibers, polarization mode dispersion (PMD), bandwidth and bit rate of SM fibers, reading of datasheets, general characteristics, transmission parameters, MFD and cutoff wavelength, geometric characteristics, mechanical properties of SM fibers
Advanced description of SM fibers 1 - Mode field, Gaussian model and real mode field distribution, cutoff wavelength and V-number, effective cutoff wavelength, detailed description of SM fiber attenuation, bending losses for step-index SM fiber, more sophisticated refrective index profiles of SM fibers, coping with dispersion in Sm fibers, dispersion solution for WDM fibers
Advanced description of SM fibers 2 - compensation of chromatic dispersion with compensating fibers (DCF), designing of DCF systems, dispersion compensating gratings (DCG), fiber Bragg gratings (FBG), production of FGB fibers, polarisation mode dispersion (PMD), PMD characteristics of SM fiber, polarization-maintaining fibers, PMD kompensation, nonlinear effects in SM fibers, nonlinear refractive effects, self phase modulation (SPM), solitons in optical fiber, cross-phase modulation (XPM), four-wave mixing (FWM) in SM fiber, stimulated scattering effects, trends in fiber desing
Fabrication of optical fibers and cables 1 - Requirements on technologies, preparation of molten glasses, fusible technologies, fibre drawing, rdawing of long fibers - double-crucible method, deposition technologies, OVPO, VAD, MCVD, PCVD technologies, optical fibers coatings, primary and secondary tight coating, optical cables for telecommunications and data transmission, basic structure of optical cable

Fabrication of optical fibers and cables 2 - Mechanical parameters of optical cables, protection and humidity resistivity, gels in optical cables, protection of optical cables to biological influences, materials for cable coatings, PVC, polyurethan (PUR), HDPE, nylon, teflon, LSZH materials, examples of optical cable datasheets

Installation methods and procedures with optical cables, Installation methods, installation in climbing-irons, cable laying into protective pipes, protection to lightning, self-supporting cables, cables for chemical industry, calbles for higher temperature, blowing technologies, new cable laying technologies of optical cables, structure of telecommunication optical lines, structured cabling systems, optical swichtgears, design of optical lines, attenuation budget, total dispersion budget

Optical fiber cable connectorization 1 - Mounting splices, fixed splices, intrinsic and extrinsic losses in splices, reflection loss, insertion loss, optomechanical splices, fused splices, fusion splicers of optical fibers, fusion splice protection, optical connectors, basic structure of optical connectors, insertion loss of optical connector, return loss

Optical fiber cable connectorization 2 -
Distribution curve of insertion loss, repeatability of connectio, mounting density of optical connectors and their compatibility with optical cables and appliances, types and materials for optical ferrules, types of optical connectors-SMA, FC, ST, SC, FDDI, ESCON, E2000, new types of optical connectors-MTRJ, MTP, MU, MINIMAC, the latest trends in connections with optical connectors

Tests and measurements of otical fibers and cables -1
Curve routing of backscattering, cable factor, shape of faults on the backscattering curve, chromatic dispersion, methods for chromatic dispersion measurement, differential phase shift, time delay of pulses, BERT, measurement of insertion loss of connectors and other passive elements in optical lines, return loss measurement

Tests and measurements of otical fibers and cables -2
Refractive index profile measurement, interferometric method, near field refractive index measurement, refractive method of refractive index measurement, measurement of cut-off wavelength for optical cables and fibers, numerical aperture measurement, measurement of cross dimensions of fiber core and cladding, MFD measurement of SM fibers

Exercises:
Working with catalogue sheets of optical cables
Calculation of mechanical parameters of optical cables
Attenuation and dispersed budget of optical route
The statistical evaluation of optical connections and attenuation
measurement, protocols for measuring
Parameters of laser beam calculation
The calculation of terminal degrees circuit with LED and LD
Coupling efficiency LED-optical fibre and optical fibre LD

Laboratories:
Measurement of VA characteristics of LED and LD
Measurement P / I characteristics of LED and LD
Measurement directional characteristics of LED and LD
Impact of the number of coils in the downturn multi-mode optical fibre
Measurement, depending on the route optical wavelength
Measurement : optomechanics connectors on a calibrated capillary
Measurement: optomechanics connectors with a V-slot
Recommended or Required Reading
Required Reading:
Ghatak,A.K., Thyagarajan,K.: Introduction to fiber optics. Cambridge University Press, 1.vydání, 1998, ISBN 0-521-577853
Agrawal,G.P.: Fiber optic communication systems. J.Wiley and Sons, 1. vydání, 1992, ISBN 0-471-54286-5
Hoss,R.J., Lacy,E.A.: Fiber Optics. Prentice Hall Inter.Inc., 2.vydání, 1993, ISBN 0-13-181389-7
Ghatak,A.K., Thyagarajan,K.: Introduction to fiber optics. Cambridge University Press, 1.vydání, 1998, ISBN 0-521-577853
Agrawal,G.P.: Fiber optic communication systems. J.Wiley and Sons, 1. vydání, 1992, ISBN 0-471-54286-5
Hoss,R.J., Lacy,E.A.: Fiber Optics. Prentice Hall Inter.Inc., 2.vydání, 1993, ISBN 0-13-181389-7
Recommended Reading:
Filka,M.: Optoelectronics for telecommunications and informatics. ProfiberNetworking CZ,s.r.o., ISBN 987-80-86785-14-1
Filka,M.: Optoelektronika pro telekomunikace a informatiku. ProfiberNetworking CZ,s.r.o., ISBN 987-80-86785-14-1

Vašinek, V., Pápeš, M., Jaroš, J., Optické komunikace II, Studijní podklady, Ostrava, 2014, 114 str., ESF
Planned learning activities and teaching methods
Lectures, Tutorials, Experimental work in labs
Assesment methods and criteria
Tasks are not Defined