454-0321/02 – Optoelectronics II (OPT II)
| Gurantor department | Department of Telecommunications | Credits | 6 |
| Subject guarantor | prof. RNDr. Vladimír Vašinek, CSc. | Subject version guarantor | prof. RNDr. Vladimír Vašinek, CSc. |
| Study level | undergraduate or graduate | Requirement | Optional |
| Year | 1 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 2005/2006 | Year of cancellation | 2009/2010 |
| Intended for the faculties | FEI | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
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.
Teaching methods
Lectures
Tutorials
Experimental work in labs
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.
Compulsory literature:
Recommended literature:
Additional study materials
Way of continuous check of knowledge in the course of semester
Podmínky udělení zápočtu:
Absolvování testu č.1 a testu č.2
Odevzdání všech protokolů z měření
E-learning
Other requirements
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Lectures:
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 Kinds of measurements, measurement at SM and MM optical cables, attenuation measurement, conditions for correct attenuation measurement, cut off method, direct method of attenuation measurement, OTDR-metr, basic parts of OTDR-metr, dead zones
Tests and measurements of otical fibers and cables -2
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
Basics of sources for optical communications - lasers Basic properties of lasers, spontaneous and stimulated radiation, population inversion, positive feedback, material loss, laser activity and conversion laser characteristics, characteristics and laser light properties, diode lasers, basic structures of laser diodes, DH, BH, stripe lasers, QW lasers, VCSEL, optical resonators, restriction of the bandwidth, DFB and DBR lasers, laser diodes with and without active cooler, datasheets parameters of laser diodes
Basics of sources for optical communications -LEDs Advantages and disadvantages of LEDs to laser dodes, creation of photons in semiconductors, light radiation from pn junction, basic description and LED characteristics, homostructure LEDs, heterostructure LEDs, surface radiating LEDs(SLED), edge radiating LEDs(ELED), light coupling into optical fiber, technology improving coupling of optical fiber to LEDs, datasheets parameters of LEDs, modulating bandwidth
Sources for optical communications-advanced description 1 -
Intrinsic semiconductors:Fermi enrgy levels and number of charge carriers, charge carriers density, effective mass of electrons and holes, doped semiconductors, materials for optical communications, PN junction unbiased, density of electrons and holes, biased PN junction, direct and indirect transitions, conservation of energy and momentum law, E-k diagram, Einstein´s rate relations, two-levels systems, equilibrium radiation from two-levels system, relationship between spontaneous and stimulated radiation, emission and absorption of radiation, absorption coefficient and linear coefficient of material amplification
Sources for optical communications-advanced description 2 -
Conditions for light amplification, population inversion-description, population inversion and methods of its realisation, three levels and four levels systems, optical feedback, phenomena in optical resonator, threshold condition for laser amplification, losses in optical resonator, total amplification and population inversion, amplification coefficient for small signals
Sources for optical communications-advanced description 3 -
Efficiency of laser diodes-internal, external, differential, power, laser resonator efficiency, threshold amplification and linewidth, radiating and nonradiating recombinations and their influence to laser diodes efficiency, conditions for high laser efficiency, heterosctuctures and their function, efficiency in terms of an E-k diagram, characteristics of laser diodes, threshold current and operating current of laser diode, spectral properties of LDs, radiation patterns of LD, longitudinal and transverse modes of laser radiation, LD modulation
Sources for optical communications-advanced description - 4
Theoretical limit of laser modulation rate, analog and digital modulation of LDs, rate equations of LD, relaxation oscillation of LD, Transfer function of LD, intensity modulation of LD, chirp, noise of LD, RIN and its description, transmitter modules, function block diagram, driving circuits of LD transmitters, link codes for data transmission, circuit solution of optical transmitters with LEDs and LDs
Sources for optical communications-advanced description - 5
Modulation circuits, controlling and monitoring circuits, coupling light from LED transmitter, coupling light from laser transmitter, backreflection protection of LD, integral characteristic of optical transmitter-eye diagram, faults of optical transmitters and their consequences in eye-diagram, internal and external modulators, Mach-Zehnder modulator, elektroabsorption modulator
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
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction