440-4114/03 – Optical Communications I (OK I)
| Gurantor department | Department of Telecommunications | Credits | 5 |
| Subject guarantor | prof. RNDr. Vladimír Vašinek, CSc. | Subject version guarantor | prof. RNDr. Vladimír Vašinek, CSc. |
| Study level | undergraduate or graduate | Requirement | Choice-compulsory type A |
| Year | 1 | Semester | winter |
| | Study language | Czech |
| Year of introduction | 2021/2022 | Year of cancellation | |
| Intended for the faculties | FEI | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
Understand the function of optoelectronic components used in optical networks.
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
Project work
Summary
This subject presents an introduction to the studies of optoelectronics problems specialized in optical communications. Except an introduction, that represents the place of optical communications in today's communication technologies, freshmen will be familiarized with fundamental properties of light essential for phenomena understanding in optical fibres. Optical fibers themselves are divided into different levels: basic description and advanced description. All fibres are described in this way, multimode, single mode and plastic optical fibers. All characteristics are described - from mechanism of light guidance, over attenuation and dispersive phenomena. As the linear so nonlinear phenomena in optical fibers are described.
Compulsory literature:
Recommended literature:
[1] Filka,M.: Optoelectronics for telecommunications and informatics. ProfiberNetworking CZ,s.r.o., ISBN 987-80-86785-14-1
Way of continuous check of knowledge in the course of semester
Passing two tests in exercises, submission of protocols from laboratory exercises
• Oral and written examination
E-learning
Other requirements
The condition for granting the credit is the submission of all protocols in the laboratory exercise and successful completion of two tests in the exercise.
• Written and oral examination
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
1. Introduction to telecommunications and optical fibers - history and development of transmission properties and parameters of optical fibers, fiber optic communication systems, basic block diagram of optical information transmission, current state in optical systems, future development trends
2. Fundamentals of optical fibers I - light conduction in optical fibers, complete reflection at the core-shell interface, refractive indices of the core and shell, cut-off angle at the core-shell interface and cut-off angle, introduction of light into the optical fiber, reception cone, numerical aperture
3.Basics of optical fibers II - mode and chromatic dispersion, solution of mode dispersion - gradient fibers, single-mode fibers
4. Basics of optical fibers III - chromatic dispersion, mechanism of chromatic dispersion, calculation of pulse propagation by chromatic dispersion, definition of transmission speed and bandwidth, connection of transmission speed and bandwidth
5. Basics of optical fibers IV - catalog parameters of optical fibers, general parameters, optical characteristics, geometric characteristics of optical fibers, specification of working conditions of optical fibers, mechanical characteristics, other characteristics
6. Fundamentals of single-mode fibers I - principle of single-mode fiber operation, Gaussian bundle, influence of core and sheath on mode field diameter MFD, limiting wavelength of SM fiber, attenuation of SM fibers, macro-bending losses, micro-bending losses, light absorption and scattering in SM fibers, dispersion and bandwidth of SM fibers
7. Basics of single-mode fibers II - chromatic dispersion, material dispersion, waveguide dispersion, conventional fibers, fibers with shifted dispersion characteristic, fibers with flat dispersion characteristic, polarization mode dispersion (PMD), bandwidth and transmission speed of SM fibers, catalog parameters of SM fibers , general characteristics, transmission characteristics, MFD and limiting wavelength, geometrical characteristics, mechanical properties of SM fibers
8. Basics of sources for optical communications (laser) - basic properties of lasers, spontaneous and stimulated emission, population inversion, positive feedback, material losses, laser activity and laser transfer characteristics, characteristics and properties of laser light,
9. Basics of sources for optical communications (LED) - advantages and disadvantages of LEDs in comparison with laser diodes, formation of photons in semiconductors, formation of light at PN junction, basic description and characteristics of LEDs, homogeneous LED transitions, LEDs on heterostructures, surface emitting LEDs ( SLED), edge-emitting LED (ELED), LED-optical fiber light coupling, technology to improve coupling, LED catalog parameters, LED modulation bandwidth
10. Basics of receivers for optical communications - basic requirements for optical detectors, basic principles and arrangement of photodetectors, photodiode on PN junction, resistance and photovoltaic mode, photodiode sensitivity, photodiode spectral behavior, longwave limit of photodetector, photodetector resolution, photodetector bandwidth, spare photodiode scheme, limitation and control of photodiode response speed
11. Basics of receivers for optical communications - PIN photodiode, avalanche photodiode (APD), MSM detectors
12. Introduction to measurement of optical fibers and cables - types of measurements, measurements on SM and MM fibers and cables, attenuation measurement, conditions of attenuation measurement, two-length method, direct method, OTDR-meter, basic parts of the instrument, dead zones of measurement, curve backscatter, cable factor, shape of faults on the backscatter curve
13. Introduction to fiber optic networks - basic concepts of fiber optic networks, terminology of fiber optic networks, optical network nodes, WDM networks and their variants, management of fiber optic networks
14. Reserve
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
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